The Creature Of The Beast - 1517 Words

In France in the late 1760’s, there was an atrocity that involved around one hundred animal-attack deaths caused by one creature, the infamous Beast of Gevaudan. Per Jaime Hill, the beast was the size of a horse and looked like a bear, hyena, wolf, and panther hybrid. It had a long wolf or pig-like snout. Many researchers believed there were at least two, or more than two, beasts roaming the area. The color of the beast changed every time the beast was spotted; it would go from red to red with grey and white patches to red with stripes. Sometimes there would even be no red, it may just be black or white. Locals believed it to be a werewolf, or a sorcerer who shapeshifted into a monstrous predator to feed on human flesh. The beast was also†¦show more content†¦June of 1767, a man said the beast could be killed, that he had found a way. He said he needed a holy bullet made of silver, blessed by a holy man. He takes the ammunition into the forest and arrives back to the village with a wolf. Villagers agree it is the beast and no beast is spotted afterwards. In 2000, historians notice things do not add up; a wolf cannot remove someone’s clothes. In 2011, researchers concluded that Jean trained the wolf, killed the people, and then killed the wolf to make it look like a beast. Still to this day, no one knows for sure what happened (â€Å"Mysteries at the Museum† n.p.). Per World of Mythology, the attacks of the beast started in 1764. People all around hunted every wolf they could find, hoping it would be the beast, but the attacks continued. In 1765, Francois Antoine killed a large grey wolf, but the attacks continued Also in 1765, a doctor came across a man in a wolf suit assaulting a woman and killed him but the attacks still went on. Finally, a man by the name Jean Chastel discovered that if a silver bullet is blessed by a church, it could kill the beast. Chastel got three silver bullets blessed by the local church and went into the woods, returning with a dead wolf. This was the final attack on a wolf by the time the attacks stopped. Chastel said he went into the woods and found the giant wolf. He was the size of a horse and looked like a panther and wolf hybrid. HeShow MoreRelatedAnalysis Of Frankenstein And The Island Of Dr. Moreau. Wells1161 Words   |  5 Pagesto unforeseen, almost cataclysmic consequences. These ideas are most clearly displayed by H.G Wells in The Island of Dr.Moreau, because Moreau believes that he is above nature and can control the wild instincts of the beast-men, and he also displays himself as a god to the beast-men. In Frankenstein these ideas are more implicitly shown. H.G Wells does a better job overall of displaying these ideas In The Island Of Dr. Moreau as it is more explicit when showcasing these ideas. One of the main ideasRead MoreThe Book Abominable Snowman 1098 Words   |  5 Pagesother â€Å"fake† beasts were actually alive and well? The commercials on television certainly did not help my brother, with Sasquatch trying to sell beef jerky and coolers being made in dedication to the Yeti. So, to help ease my brother’s concerns, I decided to look into the different beasts- Yeti, Sasquatch, and Bigfoot- to see if my brother’s fears were palpable or not. Before my search began, I was adamant that these wild beasts did not exist, but if there was solid proof of these creatures, my mindRead MoreThe Rime Of The Ancient Mariner1669 Words   |  7 PagesThe word metacognition can take many forms including knowledge and when or how to use certain strategies to learn or be used to solve problems. In Mary Shelley’s Frankenstein we see metacognitive thinking throughout mainly through victor and the creature. Both characters are seen very much throughout the s tory and through these characters we get a great sense of their metacognitive thinking, successfully in ways but for the main part we see these characters as failed metacognitive thinkers. In â€Å"TheRead MoreThe Defeat of Civilization in William Golding ´s Lord of the Flies688 Words   |  3 PagesIn Lord of the Flies, by William Golding, the Beast singlehandedly removes civilization from the island. At first, the Beast is only perceived as a minor fear, however, by the end of the book, it is perceived as an idol. The Beast is first introduced as a figment of the boys’ imagination, but further develops into a legitimate creature—by the boys—later on. By the end, the Beast becomes an actual G-d that the boys worship by offering sacrifices to it, symbolizing the substitution of civilizationRead MoreMagical Beasts By Harry Potter1487 Words   |  6 PagesMiner Ms. Vyse English II 12 April 2016 Magical Beasts Throughout the series of Harry Potter, many creatures appear in the books and put into greater detail in the movies. Were these famous magical creatures made up or compared to something similar in mythology and folklore? There are many famous creatures throughout the story that add curiosity to one?s mind when first reading about one. The feeling one may get is to be able to see what this creature is capable of doing in comparison to others. InRead MoreDragons: A Global Phenomenon Essay1229 Words   |  5 PagesHuman idealism has been the spawn of hundreds of mythical creature’s, crafting representations and symbolism with each new beast. Creature’s became the living embodiment of values that were held highly, often falling into folklore that involved human interests. One of the most globally used, and recognized creatures’s in our history is the dragon. A creature that not only appears in a variety of cultures, but has individual symbolism and traits attuned w ith each. Even today the idea of what is aRead MoreEssay on Their Inner Creature721 Words   |  3 Pagesattempt to trace the defects of society back to the defects of human nature† (204). His negativity about human nature and his idea that evil is an inborn characteristic can be seen through the story as the behavior of the boys brings their inner creature into existence. â€Å"Weve got to have rules and obey them. After all, were not savages. Were English, and the English are best at everything† (42). At the first assembly, where Ralph was made chief, Jack had said these words. Jack soon went againstRead MoreFrankenstein And The Modern Prometheus963 Words   |  4 Pagesunderstudy, Victor Frankenstein, who made a beast amid one of his trials. This beast ends up being an inconvenience for Victor. The creature depicted as a living being with all the emotions and feelings, and his appearance of beast was a huge issue when he felt that individuals dreaded him, and they abhor him. He would not like to murder individuals; indeed he attempted to spare a young lady, yet because of dread a man attempted to execute him as a beast. Victor s sibling additionally attempted toRead MoreBeauty And The Beast Analysis880 Words   |  4 PagesWillis Mrs. Heaton Film Studies September 15, 2017 Beauty and the Beast Critical Review â€Å"A tale as old as time†¦Ã¢â‚¬  A story that everyone knows and loves, Beauty and the Beast (2017) takes a modern turn on an old tale. Director Bill Condon beautifully portrays a monstrous beast falling in love with a local intelligent woman. Belle (Emma Watson) and the Beast (Dan Stevens) exquisitely show that even the most unlikely of creatures can overcome tough obstacles to find true love. Screenwriters (EvanRead MoreWilliam Golding s Lord Of The Flies1552 Words   |  7 Pagesdon’t really notice the beasts around themselves. In Lord of the Flies, Golding shows an island where nature has taken its course of the group of boys stranded on the island, who have resorted to violence to resolve all matters. This is very much similar to the supposed beast of the island that is shown as something scary, wild, and chaotic. Though the two beasts are very similar in concept, the group fails to realize that they are in fact the one and the same as the beast of the island. The group

Diversity, Crime And Prejudice Case Study Report...

Diversity, Crime and Prejudice Case Study Report Submission Form (Deadline: 2.00pm, Monday, 26th January, 2015). Read the Guide for advice on completing each of these sections of the report. These sections are expandable. Introduction Hate crime is a broad subject to begin with, this leaves it difficult to limit to a single definition. There is a single official definition for legislation purposes that cover the five strands of hate crime that are monitored within England and Wales. â€Å"†¦perpetrators’ of hostility or prejudice against an identifiable group of people is a factor in determining whois victimised†. (Hate Crime Data, no date) furthermore, academics such as Gernstenfeld (2004) suggest that the focus of hate crime should not necessarily all be on the victim, but rather the group they are associated with, minority or otherwise (See Chakraborti Garland 2009 PAGE). Others like Sheffield (1995) takes in to account social and political factors that â€Å"legitimate† violence (See Perry 2001, Page 9), the perpetrator commits a hate crime because they are acting upon pre-existing prejudice beliefs. Lesbian, Gay and Bisexual (LGB) individuals have long been considered unequal’s in society, mainly because up until recent legislation adjustment, allowing gay marriage; they haven’t completely had the same human rights as ‘straight’ individuals. Not having the same rights could be an indicator as to why sexu al orientation related hate crime is so common. Lesbian, Gay,Show MoreRelatedWhy Is Institutional Racism so Important to Our Understanding of Racial Inequalities in Britain Today?4297 Words   |  18 Pagesprivate institutions - reinforcing individual prejudices and being reinforced by them in turn. It can be defined as established law, practices and customs which in practice systemically reflect and produce racial inequalities within society. 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Chapters 6 and 7 and appendixes E and F apply to Army National Guard Soldiers when on AD Title 10, for 30 days or more, and in all other cases, Army National Guard Soldiers are governed by NGR 600–21 and NGR 600–22. Portions of this regulation that prescribe specific conduct are punitive, and violations of these provisions may subject offenders to nonjudicial or judicial action underRead MoreEducational Wastage: a Case Study of Upper Primary School Girl Dropouts in Otonglo Zone, Kisumu Municipality10149 Words   |  41 PagesEDUCATIONAL WASTAGE: A CASE STUDY OF UPPER PRIMARY SCHOOL GIRL DROPOUTS IN OTONGLO ZONE, KISUMU MUNICIPALITY BY SUSAN M. OMBATI. Reg No.: No: L50/70596/09 A Research Proposal Submitted in Partial Fulfilment of the Requirements for the Degree of Master of Arts in Project Planning and Management of the University of Nairobi. March 2009. DEDICATION To my loving dad, Ombati J. Monari for the labour of love and belief in me. 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Global Procurement and Supply Free Essays

GlaxoSmithKline:Sourcing Complex Professional Services Erin Edwards Global Procurement Supply April 22, 2018IntroductionGlaxoSmithKline also known as GSK is currently losing millions of the dollars annually in legal process. Normally, GSK always billed the law firms on hourly basis but this was not practical for the company. The team not had to research and innovate new ways to cut the spending through a new procurement process. We will write a custom essay sample on Global Procurement and Supply or any similar topic only for you Order Now GSK, GlaxoSmithKline uses an innovative approach to procure outside counsel by trading relationship based selection of law firms to an online reverse auction. However, the quality of the work, and selecting the right the law firm was a challenging hurdle to jump. GSK was willing to take up the challenge to come up with a better process of handling their spend.GSK is hit with a devastating suit and only has a certain number of days to hire a firm in time to respond. Their managing attorney Sophia Keating grapples with GSK approach to selecting suppliers. GSK employees ensured Sophia that this approach drives down cost and improves the quality of work submitted by the lawyers. Still skeptical about the process, she still runs process by comparing the competing firms and their bids. Furthermore, it was the decision by Harlow to outsource the services. GSK made strides to come up with the suitable options, and options to meet the criteria of less cost, and quality work. However, there were other concerns that could be discussed more broadly to avoid the pitfalls during the process. This case also describes the process in which this process was made and adopted beyond the implications for law firms and other service providers. Many processes seemed to only be adopted by selecting vendors for a variety of supplies and products but can be used for services also. This procurement process can be incredibly beneficial, especially streamline purchasing and tracking spend. This process can ensure a company pays the best price for goods or services, save time by choosing the most reputable vendors, and minimize order delays and mistakes. After getting early endorsement from the general counsel, Marty Harlow worked with GSK’s global external legal relations team (GELRT) in legal to develop a matter-specific, mini-RFP tool that enables in-house counsel to assess firms’ specific qualifications for a particular representation. The other main component of the OCSI is the electronic reverse auction which encourages fee competition among qualified law firms instead of hourly rates. GSK’s preferred firm roster work with procurement to draw up a shortlist of firms to invite to an OCSI event. GSK lawyers use a form-driven process to state as much detail about the matter as possible and these are passed to Harlow’s team for submission to firms. This case is very useful in talking about institutional change and how the procurement process can be adopted to many fields and services. Main Issues Uncontrollable Spending The company was spending millions of dollars annually on the spending on the legal matters. It was identified that there was also extra unnecessary cost incurred that could have been avoided through a better process that was more centralized. â€Å"More than a quarter of companies in the U.S. and UK spent over $5 million annually on litigation costs in 2012, and among healthcare companies that proportion was estimated to be 30%– 40%. Because legal fees had become a prominent line item in company overheads, top management in many companies pressured their general counsel (GC), the chief lawyer of a legal department, to rein in legal spending† (Gardner and Silverstein 2)There were some moments when the company even did not know about the spending on the legal matters, and legal department exceeded the budget sometimes. This was an issue many companies were being affected by, not just GSK. However, GSK noticed the high costs and need to be able to have a better centralized process. Therefore, it was challenging for the company to manage the spending on the legal matters and find another solid process that could not only cost less, but also provide quality services since quality is very important in the legal work. Relationship Vs. QualityGSK is engaged with the same law firms that they have had long relationships with. â€Å"One involved consolidating the number of firms with which their company regularly worked—sometimes ending long-standing relationships.† (Gardner and Silverstein 3) Relationship management is very key is long lasting business relationships, which has allowed GSK to be very successful with prior legal matters. However, through this process, the company would incur extra cost on the legal matters, because there is no cap on spend since it was tracked hourly. Since there was no centralized system to track the work and spend, GSK had no idea about the urgent matters and problems of the company. It is very important the firms that are selecting ensure that quality work is being completed without overspending. Cost does not always mean quality. GSK should have to risk quality during their cost for the best legal pursuits. Even though supplier relationship management is great, but it becomes challenges when spend is starting to become uncontrollable and unmanageable. Building closer relations with your strategic partners will minimize supply chain risks. Having strategic partners whose goals are aligned with business objectives are highly valuable and important to long term success.KPIsThere was not performance management in place to determine how the firm is performing. GSK did not have a quantifiable measure that is used to track and assess the status of the firm process. Every area of business especially complex professional services should have specific metrics that should be monitored. Having metrics will focus more on big picture financial metrics, which was an issue for GSK without the procurement process. The case does not mention how performance of the firms will be tracked. â€Å"GELRT leveraged technology to obtain?the information it needed to optimize financial performance and strengthen strategic planning. Matter management, electronic billing, and reporting systems were already in place within the legal department.† (Gardner and Silverstein 6) There is a lot of information about how GELRT uses technology to acquire information. The system is able to track spending, but there is no system in place to track KPIs.AnalysisThe process of sourcing involves the company to select suppliers for a product or service. The complete an evaluation of the supplier and finally contract with the supplier to deliver the required products or services. While procurement refers to the activity of getting the deliveries from the supplier identified and ensuring that the payments to the supplier are made. GSK adopting procurement process has helped make changes within their spend. â€Å"By 2006–2007, procurement had become heavily involved in the sourcing of many ancillary services. Harlow’s tough stance in negotiations saved GSK an estimated $23 million: $19 million from Legal Staffing/eDiscovery, $1 million from Court Reporting, and $3 million from Medical Records.† (Gardner and Silverstein 4) By taking the right initiatives in sourcing and procurement, GSK is able to see the benefits. Having a process in place will save the company time; ensure that one is getting the right solution to meet business needs. A procurement process will ensure you pay the right price and avoid overlooking vital steps that may come back to haunt the firm later. Procurement policies and procedures allow a business to arrange its buying strategy to its long-term goals and objectives. Procurement helps with a better chance to meet business goals. â€Å"This system reminds me of buying office supplies or landscaping services. Can it really be applied to a complex legal case like this one†¦.?† (Gardner and Silberstein 1) This is what Sophia Keating thought to herself when the idea of a reverse auction process was presented to her. The vendor selection process initially starts as part of a company’s strategy. A procurement process can measure the direct costs and the team timesaving achieved through better management. For example, GSK was very focus on their legal spend, which in turns means you need to select firms that would be able to handle the request in the right budget. The nice thing they had a selection of firms who meet their cost, quality and service requirements needs, but also add some firms who were new. After they shortlisted their firms, GSK was able to use OCSI for their quotes, terms and minimum service levels. Finally, review their proposals from the reverse auctions and reward the firm with the lowest number. Procurement increases an organization’s productivity by providing visibility into transactions.Benchmarking is the process of paralleling what companies are doing with what the best performing company in your industry is doing. In textbook, Purchasing Supply Chain Management describes bench making as, â€Å"Benchmarking is the continuous measuring of products, services, processes, activities, and practices against a firm’s best competitors or those companies recognized as industry or functional leaders.† (770) In Exhibit 3 of the case, you able to see how GSK compares with the other Law Firms Self-Assessment. Unfortunately, GSK managing attorney assessment does under perform in a couple areas like understanding business objectives, involvement of diverse team members, and reactiveness and creativeness. One of three types of benchmarking, process benchmarking compares operational processes. Performance benchmarking compares product or services, marketing and sales to determine how to increase profits. Short term benchmarking goals, produce quick results. But it is the long-term goals that help with the direction and strategies of the company that will make it more competitive in the market. Performance management is a performance controlling style that has grown increasingly popular with a variety of companies. Performance management is the process in which it challenges the company’s overall performance and abilities. It challenges them to bring their best foot and work forward. Performance manage usually involve setting goals, then evaluating their progress or work with a reward or penalty depending on how the firm or vendor performs. RecommendationsRun Reverse AuctionsA reverse auction is best used to obtain the best rate by embracing competition among firms bidding on price. GSK using this method will allow the law firms to compete with their best idea to win the business and also be within budget. The idea of reverse because during the auction makes sure the price drops. Price was definitely an issue for GSK previously because there was no way to track the spending. Using the method of reverse auction has a number of advantages. Some of the benefits of reverse auction is the amount of time it takes to make a decision. Before something that could takes months, can now be shortened into weeks or even days. Also, the bidders are able to see who their competition and how they compare to them. There is a lot more transparency when it comes reverse auctions. Law firms would calculate their preliminary prices and confirm the very lowest price they would go to secure the business. II. Conduct Routine Performance ReviewsPerformance management is a mutual agreement about how companies or individuals contribute to an organization’s goals. This is what OCSI can do for GSK. OCSI can act as a process of performance management and appraisals focusing on aligning GSK’s workforce, building capabilities, improving employee performance and development, and influencing better business results. GSK should complete annual performance reviews to evaluate the firms’ performance. This entails gathering feedback from co-workers and clients into consideration and observations by management. These assessments can be very detailed and elongated to include a review of the previous years’ evaluation and an assessment of services. Many firms may have the company complete an evaluation of their own performance that is then discussed during the evaluation and compared to the official evaluation. Monitoring gives the company an opportunity to make a course correction or adjust a timeline if it is needed so that the vendor will produce the desired outcome of successfully achieving goals. If GSK concludes the vendor has unacceptable performance, monitoring performance enables them to identify the problem early and get an opportunity to rectify before being evaluated incorrectly. III. Implementing a Performance-Based Incentive These systems are designed to retain top-performing vendors, motivate the desired performance, and control costs. If a company wants to pay for performance, it must define performance in very specific, objective, quantifiable terms, measure it and track it. Introducing a performance based incentive program with help firm collective help GSK reach their business goals and legal objectives. This really entices firms to align their work with the business goals. Having a reward for exceptional performance and penalties for poor performance really ensure that money is not being wasted but invested properly. IV. Routinely Fresh Preferred SuppliersIt is healthy to refresh suppliers and firms from time to time. If you consolidate your supplier base, it will allow better visibility over the billing process. It will be easier to track payments leaving the business and going to the suppliers, so any errors will be identified more rapidly. When you deal with less suppliers and vendors, there is less administration and paperwork to handle. This allows more time to focus on other areas of the business. When it comes to decreasing the number of suppliers GSK uses, it is best to control what’s best for the business. Above all, GSK needs to find the best overall fit so that there’s a steadiness between the time it takes to achieve their supplier base and the profitability of the business.Conclusion Procurement is should be viewed strategic function working to improve the organization’s cost-effectiveness. Procurement helps streamline processes, reduce service prices and costs, and identifying better firms to do services. It is essential to any business that purchases anything such as products or services. Since GSK buys services like other companies, then the better its procurement function works, the more money it can make. Typically, businesses buy products or services from multiple vendors. Procurement handles the details of procuring these purchases at optimal prices. Combining your strengths with stakeholder’ helps find new progressive solutions to remain successful in business and stay ahead of the competition. To maintain sustainable supply chain, procurement management has a profitable impact on a company’s processes. It helps avoid supply chain risks by better collaborating with vital partners and providing added value to diverse business practices. The bottom line: Performance management is an ongoing practice, not a yearly task. The success of an organization, if aligned to your organizational goals, will drive business results. References Capko, Judy. â€Å"Five Steps to a Performance Evaluation System.† Family Practice Management, 1 Mar. 2003, www.aafp.org/fpm/2003/0300/p43.html.Gardner, Heidi K, and Silvia Hodges Silverstein. â€Å"GlaxoSmithKline: Sourcing Complex Professional Services.†Ã‚  Harvard Business Review, 26 Feb. 16, hbr.org/product/glaxosmithkline-sourcing-complex-professional-services/414003-PDF-ENG. Accessed 18 Apr. 2018.Markgraf, Bert. â€Å"How to Evaluate a Company’s Performance.†Ã‚  Small Business – Chron.com, Chron.com, 5 Feb. 2018, www.smallbusiness.chron.com/evaluate-companys-performance-67095.html. Monczka, Robert M., et al.  Purchasing and Supply Chain Management. South-Western, 2011.Wincel, Jeffrey P.  Lean Supply Chain Management: a Handbook for Strategic Procurement. Productivity Press, 2008. How to cite Global Procurement and Supply, Papers

Lost in Life free essay sample

The blue birds chirping like the melody of a beautiful song.That is the only beautiful thing out in the woods, all alone.Alone, separated from my family.I wandered all around the woods checking the signs to see if I remembered the area that I was in. after the first couple of hours I realized how hard it is to stay on a given path, especially with all the obstacles in the way. Terrified and frightened I jumped and yelped at any little noise that the forest would make. The more that I thought I was going in circles the more frustrated I got. Insects were buzzing all around me.I swatted at them but it did little good.I started to wonder if I was able to get out. I was all to familiar with being lost.My life was all jumbled and mixed up kind of like I was lost. We will write a custom essay sample on Lost in Life or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page What did I want to do when I got older?The impact of that decision would impact the rest of my life.I went over what I loved and what I did not love. Nature was a big part of my life, anywhere I went it usually had nature in it.Then I realized that I like fishing a lot.So I thought what would have fish in a college major?Then It clicked, marine biology had everything that I wanted to do when I got older so I made my choice.I then settled down and thought about how I was going to get out of the woods.I kept a calm mind because if I had a clouded mind I would not be able to think clearly.I knew that my family and I were going north based on the sun , so I started to head south back to where the trail should have been.After two or so hours I found the path we were traveling on. The moon was just starting to shine as I found my way back to the campsites. My family was by the end of the trail waiting as a team was sent out to find me.My mom was crying as was my dad the officers were broug ht out and then I decided that any obstacles can be overcome as long as you have a plan and a clear mind.

Engineering and Teton Dam

Introduction Engineering is an important part of human existence. It may not be obvious at first but once the term engineering is defined as the manipulation of the natural environment through scientific means, its value is made more evident. Even in pre-historic times, ancient peoples rely on engineering feats to solve their problems. But in the modern world engineering has become an indispensable tool for human survival.Advertising We will write a custom research paper sample on Engineering and Teton Dam specifically for you for only $16.05 $11/page Learn More The importance of engineering is linked to technology and innovation. Most of the time, innovation and technology is a positive development in the lives of people. But in certain occasions the inappropriate use of innovation and technology has brought more harm than good. In cases of man-made disasters, scientists, investigators and various stakeholders attempt to understand the engineering aspec t of the application of the said technology. In this particular study the Teton Dam disaster is the object of inquiry. Before going any further it is important to reiterate that engineering innovation is a key to sustainable growth. Engineering innovation can be the main difference between the survival or the demise of a firm. Organizations that did not invest in the research, development and use of engineering innovation may find themselves in the brink of obsolescence or bankruptcy. Some of the more important companies in the last fifty years understood the importance of engineering innovation. There must be a continuous move forward when it comes to engineering innovation because according to experts in this field, it has become a survival imperative (Christensen, 2001). The same thing can be said about national governments and local communities. It is critically important for a city, state, and nation to look ahead and prepare for the inevitable. But more often than not, enginee ring innovation is the by-product of a need to solve a particular problem. In the case of the State of Idaho and the town of Rexburg, engineering innovation was needed to deal with the growing needs of an expanding township. In the latter part of the 19th century, settlers began to pour into the area near Idaho falls because of the discovery of gold (McDonald, 2006, p.9). One of the locations chosen to build a town to support the gold prospecting activities in the said region is Rexburg. For many decades the local residents contributed to the success of the area and agriculture became the region’s lifeblood (McDonald, 2006, p.9).Advertising Looking for research paper on engineering? Let's see if we can help you! Get your first paper with 15% OFF Learn More It did not take long before the region became known for the abundant harvest of wheat, sugar beets, and potatoes (McDonald, 2006, p.9). But with the success of the settlement also comes the inevitable problems related to sustainability. Thus, there came a time when the need for a dam was deemed a necessity. Teton Dam In 1964 the U.S. Congress approved the construction of the Teton Dam on the Teton River located in the southeast portion of Idaho (Williamson, 1997, p. 31). The purpose of the dam was for the benefit of the residents living in the area. The goal was to complete an engineering feat that would help control the chronic flooding as well as to provide irrigation and recreational facilities for the people living in the area. The construction of the said dam was started in 1972. But the necessary preparation was made years before the first construction material was brought to the site. When the dam was completed the people marveled at the fact that the structure was 305 feet high and the base was almost 1,700 feet thick (Williamson, 1997). After the completion of the project the homeowners and farmers placed their trust on the Teton Dam and as a result many of them cancelled their flood insurance (Williamson, 1997, p. 311). They were confident that the presence of the dam has eliminated the possibility of further flooding. But they were mistaken. A competent engineer should have been contracted by the residents to determine if the Teton Dam was impervious to leaks and other structural problems that could bring about the destruction of dam. They needed to find out if the dam can protect life and property. The Disaster The dam was designed to hold significant amounts of water. It would require massive and impervious structure to contain the potential energy contained in the daily impounding of free-flowing water from the Teton River. Seepage, cracks and other minor imperfections must be corrected because these insignificant failures can be multiplied after the passage of time. In the case of the Teton Dam, the engineers and workers were unable to fix the problems in time. The cracks became unmanageable until it resulted in the total destruction of the said dam. Advertising We will write a custom research paper sample on Engineering and Teton Dam specifically for you for only $16.05 $11/page Learn More There are three main reasons why the dam failed. First, there was an urgent need to build a dam for the sake of the community that lives nearby. It can be argued that the urgency forced many to shortcut the process. In other words engineers, surveyors, politicians and other stakeholders were pressed for time to complete the dam. The second major reason is the failure of the government agency and the surveying team to properly acknowledge the importance of the geological features of the Teton River. Subsequent investigations would reveal that the dam was constructed in an area composed mostly of volcanic rocks such as rhyolite. It is a type of rock that is lightweight and easily fractured (Ellingwood Kanda, 2005). The third major reason is the absence of an independent consultant that can provide an unbiased asse ssment of the site and the overall design of the dam. In June of 1976 the reservoir was nearly full and it should have been a cause for alarm but all the stakeholders were confident that the dam was built to withstand that kind of pressure. But a week later on June 5, 1976 a worker spotted two cracks in the dam and this was followed by another large leak two hours later (Williamson, 1997, p. 312). Water seepage was already observed in the days prior but engineers knew that water seepage is a usual occurrence in dams (McDonald, 2006, p. 30). However, there should have been a system in place that could have accurately interpreted the implications of a 40 gallons per minute of water seepage. The absence of monitoring capabilities and risk assessment in the case of a water seepage was a serious weakness in the overall design of the said facility. It was a Saturday morning and therefore many residents were outside their homes as they try to enjoy the weekend. While many were enjoying the water downstream, dam authorities were trying to use bulldozers to push earth into the widening gaps of the Teton Dam. But when the workers realized the futility of their actions they left their bulldozers as strong currents began to wash away the heavy machineries.Advertising Looking for research paper on engineering? Let's see if we can help you! Get your first paper with 15% OFF Learn More The officials of Teton Dam initiated an evacuation that was considered unnecessary in the previous months. As a result they only had less than an hour to warn the residents of Wilford and Sugar City, the communities that were directly in the path of the rampaging floods (Williamson, 1997, p. 312). Eleven people died and the houses of residents were devastated. Engineering The disaster that occurred at Teton Dam is a man-made disaster. There can be many factors such as the destruction of the environment and human errors. But the root cause is a fundamental problem when it comes to engineering. It is therefore important to take a closer look at how engineering is perceived by people and engineers themselves. It is therefore surprising to find out that there is no agreement when it comes to its definition. According to one view, engineering has something to do with design (Poel, Goldberg, Davis, 2010). This idea makes sense because nothing can function properly without an appropriate design. For instance, a sports car can only achieve extraordinary speeds not only because it has a big engine but because of the other design considerations. It is important to consider design factors such as weight of the engine, its structural design that enable it to burn fuel at the most cost-efficient rate and of course the overall design of the car that enables it to deal with the effects of drag. Another insightful definition is given by another group who asserted that engineering is â€Å"the transformation of the natural world, using scientific principles and mathematics, in order to achieve some desired practical end† (Poel, Goldberg, Davis, 2010, p.3). This definition fits well with the current analysis of the Teton Dam disaster. In the case of the Teton Dam engineering requirements should not be limited with the design of the dam but also the need to determine if the construction site is suitable for the design of the project. A well-conceived design is useless i f the geological features of the river is seen as inappropriate and therefore making it a risky proposition to build a dam. A good way to understand a perfect strategy to construct a dam is to study successful projects in order to compare their methods with those of the experts. In the case of dam construction one of the standards in preparation, design and construction is the Hoover Dam. An overview of the construction process will reveal that the engineers working on this project did not leave anything to chance. Their preparation includes site studies to know more about the lay of the land as well as to determine the logistical requirements of moving men and materials to the site (Wolf 6). In other words the engineers conceived the project from beginning to end. Going back to the discussion on engineering innovation it is important to realize that the work of the engineers must not end with the creation of a solution to a particular problem. In this case the construction of the T eton Dam was the answer to chronic flooding and the need for irrigation reserve. But the job of the engineers must not end right after the turnover of the project to the local officials and the residents. Engineering innovation must be constant feature of their work. In this case engineering innovation is needed to sustain the project, specifically to develop strategies to ensure that it will not rendered useless through human error and natural calamities. It is easy to understand why the engineers did not think beyond the construction phase of the project. It requires a motivated team and motivated leader to push through with any type of project that would lead to innovation (Tidd Bessant, 2009, p.100). At the same time the engineers working at Teton Dam must have the support of a group of investors and policy makers that would encourage them to pursue their goals. Conclusion The Teton Dam disaster is a man-made disaster that could have been prevented if appropriate engineering pr ocedures were observed. There was not enough preparation made in order to ensure the viability of the project. The stakeholders wanted to construct a dam on the Teton River because they believed that it was beneficial for all that were involved in the endeavor. It can be argued that the project was approved without consulting the opinion of a third party consultant. An unbiased assessment of the site would reveal that the geological features of the area could not handle the weight created by super-sized structure like the Teton Dam. Furthermore, it must be pointed out that engineers must not only come up with appropriate designs, they must also consider the possibility of failure. Human error must never be discounted and therefore, engineers, in collaboration of the other stakeholders should have developed an emergency disaster response. At the same time engineers should have created a monitoring capability that can provide feedback with regards to water seepage and the existence of cracks. This monitoring system should be able to determine the acceptable threshold before a dam would break. References Christensen, C. et al. (2001). Harvard Business Review on Innovation. MA: Harvard Business School Publishing. Ellingwood, B., Kanda, J. (2005). Structural safety and its quality assurance. VA: American Society of Civil Engineers. McDonald, D. (2006). The Teton Dam disaster. CA: Arcadia Publishing. Poel, I., Goldberg, D., Davis, M. (2010). Philosophy and engineering: an emerging  agenda. New York: Springer. Tidd, J. J. Bessant. (2009). Managing Innovation, Integrating Technological,  Ã‚  Market Organizational. New Jersey: John Wiley Sons. Williamson, D. (1997). River tales of Idaho. ID: Caxton Printers. Wolf, D. (1996). Big Dams and Other Dreams: The Six Companies Story. OK: University ofOklahoma Press. This research paper on Engineering and Teton Dam was written and submitted by user Marlee Ratliff to help you with your own studies. You are free to use it for research and reference purposes in order to write your own paper; however, you must cite it accordingly. You can donate your paper here.

buy custom Antenatal Care essay

buy custom Antenatal Care essay This essay is based on a case study (attached in the appendix) and basically examines the care given to a woman through her pregnancy to the time she gives birth. The case study involves a complication (episiotomy) and throughout the essay an effort is made to refer to the case study showing the relevance of what is being discussed to the case study. The essay is structured into three parts: the antenatal care, the post partum period and the post natal care. Many changes are experienced during pregnancy. The changes are mainly hormonal and according to Dr. Cullin (2009, par. 1) include, enlargement of the uterus, nipples and breasts and gaining of weight (Cullin par. 1). Other changes may include reduction in sexual desire, constipation, aches and pains in the abdomen and lower back, skin texture change, nausea or vomiting, heartburn, tiredness and other discomforts which have not been experienced before. In most case pregnancies proceed without many complexities. However care should be taken to ensure that pregnancy proceeds in the correct manner to avoid later development of complexions due to oversights which were made early on. Some of the warnings to look out for include: sudden weight gain for instance two pounds within one day severe swelling of the ankles, feet or face severe or frequent headaches which are quite persistent fainting, flashes of light, and blurred vision burning or pain during urinating a sudden feeling of thirst dramatic decrease or increase in urination vaginal bleeding (light) and sometimes unusual discharge Pregnant women ought to look for the light signs which indicate slight problems as well as those which indicate serious problems. One such sign indicating big complexity likely to occur is the occurrence of premature labour. The signs for premature labour include: strong uterine contraction every 10 minutes or less; the lower abdomen experiencing menstrual-like cramps repetitively; pelvic pressure which gives a feeling of the fetus pushing down; and sudden water breakings. The pregnant mother ought to take precaution against some substances which may affect the fetus which and not limited to teratogenic agents. Toralles et al., (2009, p. 1) defines teratogenic agents as, physical, chemical, or biological agents or nutrient deficiencies that lead to fetal structural or functional alterations (Toralles et al. p. 1). They argue that pregnant mothers ought to be sensitized on the effects of these agents on the developement of the pregnancy, the delivery process, and the post natal care for both the baby and the mother. Pregnant mothers should desist from the use of stimulants and foods which are not advisable to be used during pregnancy. This way, chances of developing complications are reduced (Pillitteri, 2007, p. 198; Toralles et al. p. 1). Buy custom Antenatal Care essay

The history of tequila in mexico Research Paper

The history of tequila in mexico - Research Paper Example Known as the tree of miracles, the Agave plant is the only source of Tequila drink (Earth Bar Magazine 1) where it takes about nine years for an agave plant to be ready for harvesting, processing, and distilling to make the Tequila drink. The history of Tequila in Mexico confirms that the drink is a symbol of cultural heritage with a cultural significance that supersedes the status of alcoholic beverage (James 1). The process that produces Tequila represents a cultural blend as it defines the indigenous Prehispanic culture of Jalisco, Mexico and the emergence of the Spanish distillation process (Festa 1). This marked a Spanish and Mexican cultural blend (James 1). This cultural blend has passed to the current generation where the production and consumption of Tequila in Mexico portrays a cultural blend. The ancient tribe of Mexico, the Aztecs, the Chichimecans, the Otomies, the Toltecan’s, and the Nahuatls who drank beverages made from the Agave plant initiated the history of the Tequila in Mexico (Earth Bar Magazine 1). Indeed, the Aztecs were the first people to ferment sap from the local agave plants that made Tequila in the pre-Hispanic times (La Cava del Tequila 1). On the other hand, the Nahuatl’s worshipped the Agave plant that made Tequila (Earth Bar Magazine 1). The blue agave plant that produces sugar that later forms Tequila is native to northwestern state of Jalisco (Earth Bar Magazine 1). The arrival of the Spaniards in Tequila, which is in a region of Techinchan in the old Aztec Empire and Jalisco state of Mexico, led to the introduction of the European influence on Tequila (Earth Bar Magazine 1). In the 1000 B.C the Mayan and Aztec leaders produced and consumed pulque, which was North Americas first known alcoholic beverage (La Cava del Tequila 1). The Mayan and Aztec leaders made the pulque drink from the fermented maguey plant’s sap (La Cava del Tequila 1). The

E-Business strategy Essay Example | Topics and Well Written Essays - 2500 words

E-Business strategy - Essay Example Starbucks Company also has an information technology department that incepted its first website in 1998. This use of website has enabled the company slowly embrace and transact with e-commerce. In the year 2000, Starbucks Company managed to upgrade its server system to the Microsoft Commerce server 2000, which led to a remarkable improvement witnessed in its online service delivery. The Company has continually embraced e-commerce by purchasing different commerce servers in relation to the change in technology Stanford-Smith and Kidd 2000.The presence of e-business and e-commerce has enabled Starbucks Company to consistently purchasing numerous advanced registers and coffee machines to replace the old systems. The use of these new systems has contributed to the improvement of staff‘s efficiency and the speed, with the inclusion of assisting the shops to produce better quality coffee products. The use of these new materials and processes has resulted in the company. Starbucks Com pany and coffee houses no longer experience annoying queues to be served. This ensures the Starbucks considerably expand its customer base, and assist in the improvement of better customer relations.E-business has become one of the few technologies strategies that have been sort of by many companies and organizations. Through this technology, companies are able to improve their facilities by the use of the internet, intranet and extranet in ensuring that they have both intra and extra communication within the company, and the outside world.... Some of the issues that need to be addressed include poor communication between the staffs, customers and the external world. Rationale for The process mapping of Starbucks technological advancement Starbucks has made some efforts to improve customer communication. This has been central to design evaluation. These efforts include development of the brand in order to improve customer experience. One of these processes involved improvement of internal communications in the effort to ease customer base connection. Sophisticated feedback machinery sees to it that customer’s feedback is collected and acted upon in an effective and timely manner. One of such an effort includes the intention by the company to partner with Square’s GPS mobile for improved payments. In addition, through GPRS, the customer can be able to receive alerts on any updates including special offers. Starbucks can also get alerts whenever a returning customer has returned for more. Furthermore, Starbucks was named the most popular social media brand. It uses several social media sites to reach out new customers and continued communication with the old customers. Some of the popular sites used by Starbucks include Facebook, Twitter, and Foursquare. In addition, the company has adopted the use of digital network in its stores. With Wi-Fi availability, the company is able to entertain customers with digital networks. The process mapping of Starbucks technological advancement The Intertwining E-business and Starbucks can be intertwined. This is because e-business uses tools like mobile phones, file transfer, video conferencing, internet, intranets, and extranet to improve the administrative and operational activities. It ensures that Starbucks is in a position to access the internet to source

Specific Applications of PR & PA Essay Example | Topics and Well Written Essays - 1250 words

Specific Applications of PR & PA - Essay Example The essay takes a descriptive approach where societal factors as well as economic factors affecting the role of public affairs and public administration are discussed. Public Relation has been recognized as one of the vital managerial functions of an organization. It is because of the fact that with effective Public Relations an organization benefits a lot like to say it helps to create a better image in the organization in times of severe crisis through removing the misunderstanding among the organization and their public, enables to provide sufficient information about the launching of their new product or services, helps to overcome resistance, removes contradictory conditions between the organization and its public and lastly it helps to announce any unfavorable conditions is going to happen in the future (Theaker, 2001). The subject matter of the study is how a Public Relations plays an important role in the context of social and economic. Before passing to the role, it is necessary to understand the concept of Public Relation. Public Relation is essentially a management function which involves monitoring and evaluating the attitudes of the p ublic which include shareholders, government, consumers, employees and the media, through continuous communication with them so as to establish and maintain a mutual relationship and understanding between an them and the organization. In other words it can be told as a managerial function which assists in establishing and maintaining the mutual flow of communication, understanding, acceptance and cooperation between an organization and its publics through keeping in touching with the public, by calling a conference, working with press or through communicating with the employees. Public Relation plays an important role in the organization in terms of social and economic context. In the context of social, the organization should be very careful in choosing the Public Relation applications. Because every organization stands in the society and has a responsibility to protect the interest of the society in general, so there arises the duty of organization to choose an effective Public Relation. The society comprising of people near to the company must be aware of the policies or the product that is going to launch. If any decision is taken which may influence the society negatively ultimately it may affect the smooth running of the organization. So before going to execute any programs for communicating with the society it must evaluate or analyze opinion of the society (Sriramesh, 2003). For this Public Relation should be an effective one. An effective Public Relation can establish and maintain a mutual relationship between the organization and its public. Such P ublic Relations helps the organization to know about the likely comment about the product and the organization. On other hand in the context of economic, there is no doubt that the adoption of Public Relation in the organization will not be a waste to the organization. Instead of that it will provide so many economic benefits to the organization in terms of economic. That is with the effective Public Relation an organization can achieve the objectives at very low cost as compared to other promotional

Effects of Material on Braking Abilities

Effects of Material on Braking Abilities Abstract: The most important utility in our lives as of today is automobiles, there is a lot of research and development is going in every section of the automobile field to give the safest possible vehicle to the world. One such is Brakes section; this is very important part in every vehicle, though we have most accurate and efficient brakes now-a-days, but they fail at the extreme conditions of heat , vibrations , high frequencies etc., this project is mainly concentrated on the aspects which are causing adverse affect to fail and create unusual   disturbances in the brakes. One such is brake squeal, an unwanted sound which is caused due to the vibration of the brake pads against the disc generating the high pitch noise. There are few other problems which leads into the high frequency problems, vibrations, tear in the brake disc etc. Here in this project a detailed study of disc brake is taken into account by considering with two different materials cast iron and aluminium alloy. The performance of brake is studies using normal stress analysis, vibration analysis and thermal analysis. The main problem of squeal can be due to the combination of vibration in brake set-up from callipers to the brake discs. And can also due to the uneven surfaces of the brake disc which causes due to the improper heat dissipation in the brake disc, all this problems are kept into consideration and this analysis are carried out for brake disc with two different materials as mentioned. A simple change in the design of brake disc has also been done for the maximum heat dissipation and this design also studied in this extreme conditions. And these two type brake disc are compared in all its possibly calculated attributes and the best one is concluded. Introduction: An automobile is a creation of history when they started and now it has become a crucial part of the world. Automobile is a wheeled motor vehicle used for transporting passengers, good etc. There has been a lot of improvement in the automotive field in all ways from the past few decades. The main aim of the automotive department is to provide safest vehicle from its design to the material used for each component. Every single thing is decided on basis of the effect of it on the human lives. The vehicles we use are very efficient when compared with older generation vehicles, the safety increases with the development and technology. But there are few problems which are yet to be solved. One such is about brakes, as we know BRAKES are the most important part in the every moving body, we have seen very drastic improvement in the methods of braking system. In olden days the brakes were handled by hand and now we have disc brakes and hydraulic brakes.   But the whole concept of brakes is working on same principle of kinetic energy is converted into heat energy. We find brakes very commonly used in cars, bikes, aeroplanes, automated machines etc. Brake is a device which decelerates the vehicle or machine by converting its kinetic energy into other form of energy, which will bring the vehicle down to the rest. We have disc brakes now which require very less amount of effort and time to stop the vehicle due to its accuracy and sensitivity; this are widely used in vehicles now-a-days. The drum brakes were used for very long time and we use even now, these were also very efficient brakes but due to the very common issues of changing the brake pads very often due to the short hand braking or improper usage, this has been replaced by disc or hydraulic in few machines. But we have found very common issues in disc brakes due to the brake rotor and brake pads. Due to the high friction while short braking we get unwanted noise brake squeal, though it doesnt have much effect on the performance of the vehicle, but it may fail the brake due to the tear o f brake disc or brake pads. A detailed study of each problem will be studied in further report taking disc brake system. History of Brakes: Invention of brake has started with the automated machines; brakes came into light mainly when the motorised wheeled vehicles came into existence. Brakes were not only used in the vehicles, these are used in other machines as brake lever to stop the motion rotor and so on. It has been an essential part of the moving systems. Brakes have developed a lot from first generation vehicles to present time. Early braking systems used steel rimmed wheels to stop the vehicle, which consists of curved wooden block designed to bear against the steel tire when operated by a single leverage system from the driver seat. But the brake shoe used was normal way of braking either in the horse drawn vehicle or steam locomotive. In 1895 Michelin Brothers move a step ahead to replace the steel rimmed wheels with the pneumatic rubber tire to come out with a new braking system as the brake shoes were no longer satisfactory.   A new method of braking system was required in those times as two early devices attempted to apply the friction force to the axle or to drum on axle or transmission shaft were not efficient as wanted. One method was use of wooden block inside a flexible contracting metal band which when pressed together would tighten the drum causing friction between the drum, which is connected to the wooden block and w heel, then the vehicle gets slow down. The other method was inner wheel or brake drum which will add an external contracting band to bear against the drum to bring the vehicle to rest. In 1899 Daimler started cable operated braking system; a cable was wound around a drum and attached to the chassis, so that when the cable is tightened when car was moving forward, the rotation of drum will increase the tightness and grip of cable, so that it will reduce the amount of force required to pull the cable-lever on the pedal to stop the moving vehicle. This brake system worked well but still the braking efficiency was less, the added efficiency called servo assistance is still an important factor in drum brakes even today. The external brake was vulnerable to the atmospheric conditions like weathering and to un-even roads which caused a rapid loss of efficiency and wear of the brake shoe lining and on few times automatic brake use to happen due to the drum expansion. To overcome all these problems an internal shoe brake was developed were the expanding the brake shoes were placed the inside the brake drum, mainly to protect from the dust and weather. Originally early brakes were operated by mechanically, i.e. the transformation by mechanical system was used to expand the brake shoes against drum by the drivers effort applied on the brake pedal. It works by pressing the brake pedal, which make cam to rotate by a lever connected to pedal, which forces the shoes to come on contact with the brake drum. And springs attached to both of the brake shoes to retain the original position when brakes are released. As the early brakes use to operate on lever supported cables and linkage system of fixed rods, equalising the same amount of brake pressure on the wheels has presented many problems , which were solved when hydraulic system was introduced, which used fluid to transfer the force applied to the brake pedal. In hydraulic braking system the set-up of cylinders and pipe lines forms a closed system which is filled with fluid. The pressure generated in master cylinder will transmit equal force to the each wheel cylinder and then equal pressure is applied to all brake shoes. This hydraulic system is used with the disc brake as well. Disc brake is more efficient braking system which was used mostly sports car when introduced but now it has been a very common system in passenger vehicles. It has a disc and a calliper is attached to it which can be operated mechanically, hydraulically, pneumatically, electromagnetically. Types of brakes: The brakes are broadly explained as using friction, pumping or electromagnetism. But one brake system can also use more than one principle. As the project is based on the disc brake we will look forward only to discuss about the frictional brake. Frictional brakes: These types of brakes are mostly rotating devices with a stationary pad attached with a rotating surface. These types of brakes are widely used even now in modern automotive braking system. Basically this are developed from band brakes to drum brakes then to the disc brakes. Band brakes: A simple type of brake, works on a principle that a band is wrapped round the rotating drum. When a force is applied on the lever, the restraining torque is found from the difference in tension between the two ends of the belt. The principle of operation of the band brake is same as for belt drives. This is external type braking system, as we see in picture the brake shoe are mounted on the drum. Ref: http://school.mech.uwa.edu.au/~dwright/DANotes/brakes/intro/intro.html Drum shoe brakes: This type of brake usually mean the brake shoe is mounted to press the inside surface of the drum. Two brake shoes are connected with a calliper set-up; it has lining on it which will create a frictional force when pressed towards the moving surface of the vehicle. These types of drum brakes are still used in modern cars due to the some cost and engineering benefits. These are applied to the rear wheels of today cars. Ref: http://school.mech.uwa.edu.au/~dwright/DANotes/brakes/intro/intro.html Disc Brake: these most widely used brake of these days, A disc is mounted on the wheel or axle and brake pads are placed within the jaws of the calliper, this is give the necessary friction when it will grip on the brake disc. Ref: http://static.howstuffworks.com/gif/disc-brake3.jpg Characteristics of brakes: Brakes are described on basis of several characteristics as Peak force: The maximum force obtained to decelerate the vehicle is called peak force. Few times this can be more than the traction limit of tires, then the wheel gets skid Continuous Power dissipation: As we know that the brakes get hot in use and get fail when the temperature gets too high, the maximum amount of power that dissipates through the brake without failure is the continuous power dissipation. Fade: Due to the over heat of the brakes the surface of the brake pads or disc get fade which will cause decrease in the effectiveness of brakes. Few times even cooling will have big effect on to fade. Power: when a very less force leads to the braking force, which is higher than the other brakes in similar class then its stated as powerful brake, which is due to the sensitivity of the brake system. Durability: Friction brakes have the lining which has wear surfaces, these to be renewed periodically.   Like brake shoes, pads or brake disc. Even if wear surface due to brake shoe generates high peak force this will lead to wear quickly. Weight: In some circumstances brakes are often mounted on wheels, this can disturb the traction significantly. Here weight means brake itself or an additional support structure Noise: generally brakes create some minor noise when applied, but sometimes create a high pitch noise called squeal or grinding noise. Principles of braking system: Brakes work on simple principle to slow down the moving vehicle by applying an external force, it may use more than one component; directly or indirectly several components effect on the momentum of the moving vehicle. Various types of process are used for braking effect. Frictional brakes are most commonly used these days, these works on the simple mechanism of changing the kinetic energy into the heat energy, which is done by only factor friction. Friction is created when a stationary brake pad grips on the moving brake disc with a force applied. This type of braking system is also used in the disc brakes; the stationary brake pads rub on the disc rotor which moves relatively in its own axis. Basic laws of braking system: Braking system can be explained by two simple Newton laws; which will explain the whole concept of the braking system As we know that the Newtons second law The net force on an object is equal to the its mass times its acceleration and points in the direction of the acceleration F = m* a The law is used to find out the net force required by brake pads to bring the moving vehicle to rest, tough there are many other factors to be considered for calculation of brake force which will be discussed further. It can also be explained through Newton first law Every object remains at rest or in motion in a straight line at constant speed unless it is forced to change its state by an external force if we check this law, an external force (brake force) is required to change the state of the vehicle (motion to rest). As this law explained the evaluation of the brake force and system of braking, a further law explains how the brake force will stop the vehicle. Law of thermodynamics: Energy can neither be created nor be destroyed; it will be converted from one form of energy to other form. This explained the frictional force (brake force) is converted into the heat energy. Factors considered while Braking: There are many factors to be considered for the high braking efficiency and performance; here we will see the few important factors which have a more effect on braking efficiency. 1. Condition of disc rotor: An uneven disc or ruffed disc rotor will decrease the braking effect; it has to be very well maintained as few a times due to dust and weather a extra layer is formed on the disc surface which will have a negative effect on the braking concept. Or wear of disc rotor due to overheat. 2. Pressure on brake rotor: A sufficient amount of brake pressure is to be maintained to get enough frictional force to stop the vehicle. If less pressure is applied it will directly affect the brake efficiency as force acting on the two rubbing surface will become less. 3. Contact surface: The area of contact between the brake pads and disc rotor should be more then the high friction is obtained. If lining of brake pads or surface of disc rotor is uneven then area of contact will be less, which will affect the brake efficiency. 4. Tyres: The design of tyre also have a normal affect on the brake efficiency, the more the contact of tyre to the road surface the good will be the braking system. Worn tyres will have less braking action and will not allow vehicle to stop the required point and may also skid, braking action is found high in new tyres due to its more contact with the road surface. There are other factors which also play an crucial part in brake efficiency like aerodynamics, heat dissipation, weight of body etc., Causes of failure: The most commonly found causes for the brake failure are 1. Oil or grease on the brakes will cause failure as it interferes with the friction. If we found oil in brakes mean the oil seal has failed and is why oil is leaking. 2. Overheat of brakes to great degree, which will develop a hot spot on the rotor and drums. This spots will resist the friction from brake shoe and pads, therefore braking power is lost and brake fails. 3. Brake squeal which indicates the tear in the brake pads, by the time the brakes start making a grinding sound, they would have worn out past the pads to rotors. This will require to change more than just brake pads for new one, which will increase replacement cost as well. 4. Improper wheel alignment or disturbance in the steering system will also lead into the failure of brakes. Even if the mass of vehicle will get out of its range due to extra load will cause a brake failure due to the uneven load distribution. DISC BRAKE Introduction: Disc brakes came into existence in 1890s in England. But due to the poor state of roads and dusty conditions the disc and pads use to get rust and get wear, so the system got non-viable at that time. But later it was fully adopted in 1950s with new innovations in the previous design. Many companies started using it in their cars as it was better when to compared with drum brakes, the main reason as it has overcome the brake fade problem by providing the resistance to the brake components and overall performance is better when compared with drum brakes.   Disc brakes become popular in sports cars due to its braking performance. Now it has been common in commercial vehicles as well, as its used at front of the vehicles, as the front brakes perform most of the braking effort. Components: A disc brake assembly consists of a 1. Cast-iron disc (disc rotor) that rotates with the wheel. 2. Calliper assembly attached to the steering knuckle (operated mechanically or hydraulically). 3. Friction materials (disc pads) that are mounted to the calliper assembly. Operation: (Hydraulically powered) Disc brakes prove to be efficient when compared with drum brakes even the working principle is same for both systems. The basic principle of braking system The kinetic energy is converted into heat energy   When brake pedal is pressed, the hydraulic pressure is applied on the piston; it pushes the brake pad to get in contact with the disc. As the pressure increases the calliper pushes the outside pad to get in contact with the disc. Due the friction generated between pads and disc will create the braking force as the pads gets in contact fully with the disc rotor. But if we study the disc brakes widely, it shows that it does not use the much of the friction between the lining and rotor to increase the braking power as drum brakes does, they likely cause a pull between them. Disc brakes have constrained self-energizing action, there has to be sufficient hydraulic pressure to get the required braking force. The braking force can be increased by changing the size of calliper piston. Even less heat dissipation occurs as the friction surface is exposed to the air, which also reduces the braking fade.   Design of disc rotor: generally disc rotors are either solid or ventilated. The ventilated type disc rotor has cooling fins in the middle of the disc to ensure good cooling. Proper cooling ensures longer pad life and it also prevents fading. Some ventilated rotors have spiral fins which allow more air flow and better cooling. These fins are mounted on side of the vehicle and directional. Spiral fins are used in the front of the vehicles as front brakes take most of the braking action as more heat generates. Ref: https://pontiworld.com.au Design of calliper: The calliper are used as floating calliper or fixed calliper design, and these are mounted on the axle or attached to the wheel. Floating calliper type: The calliper are used as floating calliper or fixed calliper design, and these are mounted on the axle or attached to the wheel. this type of calliper requires less parts than the other type and its also less in weight and economical. Based on requirement it consists of one or two pistons. The piston is either side of the calliper. Hydraulic pressure from the main cylinder is generated and the piston thus press the brake pad towards the disc, then instantly an equal hydraulic pressure is generated at the other side and right brake pad pushed towards disc rotor and vehicle stops due to the braking force. Fixed calliper type: The calliper are used as floating calliper or fixed calliper design, and these are mounted on the axle or attached to the wheel. This type of calliper design has piston on both sides of the calliper, which provides the equal force to each brake pad. These fixed calliper types can set-up either one or two pistons on each side. The two pistons can generate a more braking force and a compact design, as these absorb and dissipate more heat, due to its size and weight. This design is capable for greater number of hard stops of short brakes without the effect of brake fade. Materials used for component: The material used for disc rotor plays an important role in braking force. The material should be tuff enough to stand on high pressures and high friction forces. Generally cast iron is used for disc rotor commercially, but ceramic discs are used for high-performance vehicles and heavy automobiles. Recent study shows that aluminium alloys also do a great job as disc. Now we will discuss in detail about the commonly used materials cast iron and aluminium alloys. Cast iron: Grey cast iron alloy is used for the manufacturing of disc rotor; it has superior properties and various advantages over other materials, as it best suitable for manufacturing and machining when compared with other materials which lead to the graphite lubricating the cut and breaking the chips. It contains 2.5%-4% of carbon and greater than 2% of silicon.   This material has good wear resistance and galling which leads to self lubricating due to the graphite flakes. The graphite microstructure of grey cast iron allows less shrinkage. The silicon percentage in the grey cast iron makes the material corrosion resistance and increases its fluidity when casting which also makes material easy to weld. Compared with other alloys of the cast iron, grey cast iron has low tensile strength , the good point about this material is the shock and impact resistance is almost doesnt exist. Here we will see the properties of the grey cast iron for ASTM 60, Tensile strength 62.5 Kpsi Compressive strength 187.5 Kpsi Shear modulus of rupture 88.5 Kpsi Modulus of elasticity ( Tension ) 20.4 - 23.5 Mpsi Modulus of elasticity ( Torsion ) 7.8 - 8.5 Mpsi Endurance Limit 24.5 Kpsi Brinerll Hardness 302 H_b Specific heat 447 j/kg deg Ref: http://www.engineershandbook.com Characteristics of Grey cast iron: Wear resistance: Grey cast iron works as excellent resistance to sliding friction wear, it is widely used for manufacturing of sliding components, most of the automobile components are made up of this item, its all because of the low coefficient of friction, resistance to the galling it has which is due to the effect of graphite flakes . This will help the disc rotor to withstand for high friction forces. Thermal conductivity: The important merit of grey cast iron is its high thermal conductivity, due to its flake graphite structure, heat dissipates occurs in material with good rate. This will increase the cooling of the disc rotor Machinability: Due to the ferrite graphite structure, grey cast iron is simplest and easiest alloys for machining and casting. This will make easy to get the typical designs of the disc rotor with spiral and fins Damping capacity: Grey cast iron has high ability to absorb vibration energy and also damping vibrations, which is due to the high percentage of the graphite flakes it has in it. It also has great property to resist high frequency vibrations. This will help disc rotor Aluminium Alloys: Aluminium is the important alloy of aluminium alloys, were the other metals are copper, silicon and magnesium. It has less tensile strength and low melting pointing. It has good casting characteristics due to its great levels of silicon (4-13%) in it. It is widely used as disc rotor due to its corrosion resistance.   But this is quite expensive when compared with cast iron. Though is in light in weight, has good electrical and thermal conductivity. It does also can be recyclable. All these properties brought a change in many industries to change their traditional materials i.e., aluminium alloys. Characteristics of aluminium alloys: Light weight: The best part of this material is its light in weight, actually its one third of steel in weight, due to its specific weight of 2.7 g/cm3. The more the energy consumed by aluminium the high will be the load capacity of the vehicle.   This will decrease the vibrations and also increases the brake efficiency due to its light weight. Properties of the aluminium alloys: Density 2600-2800 kg/m3 Melting point 660 deg Elastic modulus 70-79 Gpa Poisson's ratio 0.33 Tensile Strength 230-570 Mpa Yield Strength 215-505 Mpa Percent Elongation 10-25% Thermal expansion coefficient 20.4 -25.0 10-6 /k Thermal conductivity: its used in most of the high conductivity line like power transmission, it has twice of the copper in the properties, and its a good conductor of heat and electricity. This will increase the heat dissipation of the disc rotor. Ductility and recyclability: Due to the lower density and melting point, the material is considered as ductile, this will help to the complicated design, as we need in the disc rotor with spiral fins and groves for the air dissipation. Recyclability is also one great factor of aluminium as it consumes only 5% of the energy to melt it, and it doesnt affect its original quality of aluminium. Corrosion resistance: This is the main factor which made it to select for disc rotor manufacturing. It has a natural property of corrosion resistant as it surfaces form an oxide coating on it. While using as disc rotor further surface treatments like lacquering and anodising are done to increase its resistance towards corrosion. Major problems with Disc Brakes: The disc rotor of Disc Brakes is more exposed to the air, due to which there are very frequent chances of getting damaged. Usually this damage of disc rotor is explained in four common ways warping, cracking, rusting and scarring. Few a times the damage takes the disc into the unsafe area then the new disc is replaced with damaged ones. But sometimes using simple machining and other process this damages can be overcome. As scratches or damage on disc rotor can be removed by removing the thin layer on the disc on lathe machine if after that the thickness of the disc falls in the safe dimensions for the braking force. Warping: This is caused due to the excessive heat of the friction area of the disc rotor, due to excessive shorthand braking, uneven cooling of disc may also causes warping. If braking pads get into contact of disc excessively this will lead to warping after certain times, this warping is most commonly found in the racing cars as brakes are used very frequently due to speed and used at high gear times. There are few methods which can avoid the warping, braking at lower gear which will help to reduce the braking load on the brakes, and less heat is generated. The more the braking load, the more the heat generated and more the chances of improper cooling to take place. Changing the disc design with more fins can few times avoids warping. Improper installation of disc rotor may also leads to the warping as only the overwhelmed disc will come in contact with the brake pads. Cracking: This is found mainly in the drilled disc. Cracking occurs mostly around the edges and holes of the disc, due to the uneven expansion in severe environments. As the uneven expansion take place and the braking load varies every time the brake is applied which will lead to the cracking. And in several situations the disc will fail and no possible repair can be done. Even cracking can be overcome by maintaining proper the cooling of the disc and proper heat dissipation. If cracking is become severe then there might be a chance to replace the disc rotor. Rusting: This is found in the vehicle which are not used for period of time, the regular use keeps the friction area clean, but when not in use the friction area and slots get rusted and it reduces the braking power, due to which the strength of the disc also falls down and at this conditions disc should replace with new one. Scarring: Scarring occurs if something hard gets in contact with the disc while moving, which forms a hard spot on the disc, which reduces the braking power and weakens the brake. Generally this happens when the brake pad service life come to end and still its attached to the brake set-up then the steel support of the brake pad get in contact with the disc which creates a hard scratch. These scratches will form black slots when a vehicle come in use, and reduces the structure strength. This can be avoided by regular checking of brake pads checking life of the friction layer, machining the disc to remove the layer on surface of disc which removes the scratches. There are few phenomenal problems which has been a challenging task in braking department like brake squeal, brake judder and brake dust. These problems can be dangerous when they get on excessively. Change of design, material, brake assembly setup all these have been checked extensively to find out the perfect solution for these problems, this project is undertaken based on this problems. Lets discuss in detail about these problems and what are the methods being simplified to overcome it. Brake Squeal: squeal mean noise, this brake noise is a vehicle system problem due to the regularity and severity. The noise generated is mainly because of brake and suspension components together. This is not considered as the main problem to the vehicle were performance is the initial objective, but its not so proper for the road use. This noise is mainly between the pad and disc during the braking. But squeal can also be combination of disc, calliper and brake pads. To avoid squeal under the braking condition is not so possible, if we are assuming brake to absorb very high energy inputs. Actually this brake squeal came into account when front wheel drive and metallic brakes arrived. These metallic pads are harder than asbestos counterparts, and thus more squeal is observed if there are more irregularities and roughness on the rotor surface or if you found looseness between the pads and callipers. Few types of calliper designs are more noisier, if the pads of this callipers are not fitted so tightly and the calliper itself move around when brakes are applied. The more the brakes play the more are the chances of noise. Fixing the squeal problems in wrong way can lead to the squeal more worse. Brake squeal also occurs due to vibration of brake pads towards the disc rotor when vehicle is moving at low speed, this may not affect the braking performance much but will lead to the replacement of brake pads, this is very common problem which most of the vehicles are facing now.   Lot of methods are used to reduce the level of noise,   simple methods like having chamfers to the linings, applying grease between the pads and calliper, adding the brake shim between   the brake back plate and brake pads etc., these may help in some way to reduce the noise. Ref: http://www.aa1car.com/library/bsqueal.htm While using the methods to reduce the brake noise, have to assume the vehicle suspension system which acts more on the braking system, but at the end the squeal is avoided by trial and error method. Although we see an efficient improvement in understanding the actual reason for the brake squeal, it has been difficult to solve it. It was easily verified through the design and study to overcome the squeal, but it was different case practically. The failure was mainly caused because of the dynamic behaviour of the braking system and due to the gap between braking components. The easiest way was using high temperature Effects of Material on Braking Abilities Effects of Material on Braking Abilities Abstract: The most important utility in our lives as of today is automobiles, there is a lot of research and development is going in every section of the automobile field to give the safest possible vehicle to the world. One such is Brakes section; this is very important part in every vehicle, though we have most accurate and efficient brakes now-a-days, but they fail at the extreme conditions of heat , vibrations , high frequencies etc., this project is mainly concentrated on the aspects which are causing adverse affect to fail and create unusual   disturbances in the brakes. One such is brake squeal, an unwanted sound which is caused due to the vibration of the brake pads against the disc generating the high pitch noise. There are few other problems which leads into the high frequency problems, vibrations, tear in the brake disc etc. Here in this project a detailed study of disc brake is taken into account by considering with two different materials cast iron and aluminium alloy. The performance of brake is studies using normal stress analysis, vibration analysis and thermal analysis. The main problem of squeal can be due to the combination of vibration in brake set-up from callipers to the brake discs. And can also due to the uneven surfaces of the brake disc which causes due to the improper heat dissipation in the brake disc, all this problems are kept into consideration and this analysis are carried out for brake disc with two different materials as mentioned. A simple change in the design of brake disc has also been done for the maximum heat dissipation and this design also studied in this extreme conditions. And these two type brake disc are compared in all its possibly calculated attributes and the best one is concluded. Introduction: An automobile is a creation of history when they started and now it has become a crucial part of the world. Automobile is a wheeled motor vehicle used for transporting passengers, good etc. There has been a lot of improvement in the automotive field in all ways from the past few decades. The main aim of the automotive department is to provide safest vehicle from its design to the material used for each component. Every single thing is decided on basis of the effect of it on the human lives. The vehicles we use are very efficient when compared with older generation vehicles, the safety increases with the development and technology. But there are few problems which are yet to be solved. One such is about brakes, as we know BRAKES are the most important part in the every moving body, we have seen very drastic improvement in the methods of braking system. In olden days the brakes were handled by hand and now we have disc brakes and hydraulic brakes.   But the whole concept of brakes is working on same principle of kinetic energy is converted into heat energy. We find brakes very commonly used in cars, bikes, aeroplanes, automated machines etc. Brake is a device which decelerates the vehicle or machine by converting its kinetic energy into other form of energy, which will bring the vehicle down to the rest. We have disc brakes now which require very less amount of effort and time to stop the vehicle due to its accuracy and sensitivity; this are widely used in vehicles now-a-days. The drum brakes were used for very long time and we use even now, these were also very efficient brakes but due to the very common issues of changing the brake pads very often due to the short hand braking or improper usage, this has been replaced by disc or hydraulic in few machines. But we have found very common issues in disc brakes due to the brake rotor and brake pads. Due to the high friction while short braking we get unwanted noise brake squeal, though it doesnt have much effect on the performance of the vehicle, but it may fail the brake due to the tear o f brake disc or brake pads. A detailed study of each problem will be studied in further report taking disc brake system. History of Brakes: Invention of brake has started with the automated machines; brakes came into light mainly when the motorised wheeled vehicles came into existence. Brakes were not only used in the vehicles, these are used in other machines as brake lever to stop the motion rotor and so on. It has been an essential part of the moving systems. Brakes have developed a lot from first generation vehicles to present time. Early braking systems used steel rimmed wheels to stop the vehicle, which consists of curved wooden block designed to bear against the steel tire when operated by a single leverage system from the driver seat. But the brake shoe used was normal way of braking either in the horse drawn vehicle or steam locomotive. In 1895 Michelin Brothers move a step ahead to replace the steel rimmed wheels with the pneumatic rubber tire to come out with a new braking system as the brake shoes were no longer satisfactory.   A new method of braking system was required in those times as two early devices attempted to apply the friction force to the axle or to drum on axle or transmission shaft were not efficient as wanted. One method was use of wooden block inside a flexible contracting metal band which when pressed together would tighten the drum causing friction between the drum, which is connected to the wooden block and w heel, then the vehicle gets slow down. The other method was inner wheel or brake drum which will add an external contracting band to bear against the drum to bring the vehicle to rest. In 1899 Daimler started cable operated braking system; a cable was wound around a drum and attached to the chassis, so that when the cable is tightened when car was moving forward, the rotation of drum will increase the tightness and grip of cable, so that it will reduce the amount of force required to pull the cable-lever on the pedal to stop the moving vehicle. This brake system worked well but still the braking efficiency was less, the added efficiency called servo assistance is still an important factor in drum brakes even today. The external brake was vulnerable to the atmospheric conditions like weathering and to un-even roads which caused a rapid loss of efficiency and wear of the brake shoe lining and on few times automatic brake use to happen due to the drum expansion. To overcome all these problems an internal shoe brake was developed were the expanding the brake shoes were placed the inside the brake drum, mainly to protect from the dust and weather. Originally early brakes were operated by mechanically, i.e. the transformation by mechanical system was used to expand the brake shoes against drum by the drivers effort applied on the brake pedal. It works by pressing the brake pedal, which make cam to rotate by a lever connected to pedal, which forces the shoes to come on contact with the brake drum. And springs attached to both of the brake shoes to retain the original position when brakes are released. As the early brakes use to operate on lever supported cables and linkage system of fixed rods, equalising the same amount of brake pressure on the wheels has presented many problems , which were solved when hydraulic system was introduced, which used fluid to transfer the force applied to the brake pedal. In hydraulic braking system the set-up of cylinders and pipe lines forms a closed system which is filled with fluid. The pressure generated in master cylinder will transmit equal force to the each wheel cylinder and then equal pressure is applied to all brake shoes. This hydraulic system is used with the disc brake as well. Disc brake is more efficient braking system which was used mostly sports car when introduced but now it has been a very common system in passenger vehicles. It has a disc and a calliper is attached to it which can be operated mechanically, hydraulically, pneumatically, electromagnetically. Types of brakes: The brakes are broadly explained as using friction, pumping or electromagnetism. But one brake system can also use more than one principle. As the project is based on the disc brake we will look forward only to discuss about the frictional brake. Frictional brakes: These types of brakes are mostly rotating devices with a stationary pad attached with a rotating surface. These types of brakes are widely used even now in modern automotive braking system. Basically this are developed from band brakes to drum brakes then to the disc brakes. Band brakes: A simple type of brake, works on a principle that a band is wrapped round the rotating drum. When a force is applied on the lever, the restraining torque is found from the difference in tension between the two ends of the belt. The principle of operation of the band brake is same as for belt drives. This is external type braking system, as we see in picture the brake shoe are mounted on the drum. Ref: http://school.mech.uwa.edu.au/~dwright/DANotes/brakes/intro/intro.html Drum shoe brakes: This type of brake usually mean the brake shoe is mounted to press the inside surface of the drum. Two brake shoes are connected with a calliper set-up; it has lining on it which will create a frictional force when pressed towards the moving surface of the vehicle. These types of drum brakes are still used in modern cars due to the some cost and engineering benefits. These are applied to the rear wheels of today cars. Ref: http://school.mech.uwa.edu.au/~dwright/DANotes/brakes/intro/intro.html Disc Brake: these most widely used brake of these days, A disc is mounted on the wheel or axle and brake pads are placed within the jaws of the calliper, this is give the necessary friction when it will grip on the brake disc. Ref: http://static.howstuffworks.com/gif/disc-brake3.jpg Characteristics of brakes: Brakes are described on basis of several characteristics as Peak force: The maximum force obtained to decelerate the vehicle is called peak force. Few times this can be more than the traction limit of tires, then the wheel gets skid Continuous Power dissipation: As we know that the brakes get hot in use and get fail when the temperature gets too high, the maximum amount of power that dissipates through the brake without failure is the continuous power dissipation. Fade: Due to the over heat of the brakes the surface of the brake pads or disc get fade which will cause decrease in the effectiveness of brakes. Few times even cooling will have big effect on to fade. Power: when a very less force leads to the braking force, which is higher than the other brakes in similar class then its stated as powerful brake, which is due to the sensitivity of the brake system. Durability: Friction brakes have the lining which has wear surfaces, these to be renewed periodically.   Like brake shoes, pads or brake disc. Even if wear surface due to brake shoe generates high peak force this will lead to wear quickly. Weight: In some circumstances brakes are often mounted on wheels, this can disturb the traction significantly. Here weight means brake itself or an additional support structure Noise: generally brakes create some minor noise when applied, but sometimes create a high pitch noise called squeal or grinding noise. Principles of braking system: Brakes work on simple principle to slow down the moving vehicle by applying an external force, it may use more than one component; directly or indirectly several components effect on the momentum of the moving vehicle. Various types of process are used for braking effect. Frictional brakes are most commonly used these days, these works on the simple mechanism of changing the kinetic energy into the heat energy, which is done by only factor friction. Friction is created when a stationary brake pad grips on the moving brake disc with a force applied. This type of braking system is also used in the disc brakes; the stationary brake pads rub on the disc rotor which moves relatively in its own axis. Basic laws of braking system: Braking system can be explained by two simple Newton laws; which will explain the whole concept of the braking system As we know that the Newtons second law The net force on an object is equal to the its mass times its acceleration and points in the direction of the acceleration F = m* a The law is used to find out the net force required by brake pads to bring the moving vehicle to rest, tough there are many other factors to be considered for calculation of brake force which will be discussed further. It can also be explained through Newton first law Every object remains at rest or in motion in a straight line at constant speed unless it is forced to change its state by an external force if we check this law, an external force (brake force) is required to change the state of the vehicle (motion to rest). As this law explained the evaluation of the brake force and system of braking, a further law explains how the brake force will stop the vehicle. Law of thermodynamics: Energy can neither be created nor be destroyed; it will be converted from one form of energy to other form. This explained the frictional force (brake force) is converted into the heat energy. Factors considered while Braking: There are many factors to be considered for the high braking efficiency and performance; here we will see the few important factors which have a more effect on braking efficiency. 1. Condition of disc rotor: An uneven disc or ruffed disc rotor will decrease the braking effect; it has to be very well maintained as few a times due to dust and weather a extra layer is formed on the disc surface which will have a negative effect on the braking concept. Or wear of disc rotor due to overheat. 2. Pressure on brake rotor: A sufficient amount of brake pressure is to be maintained to get enough frictional force to stop the vehicle. If less pressure is applied it will directly affect the brake efficiency as force acting on the two rubbing surface will become less. 3. Contact surface: The area of contact between the brake pads and disc rotor should be more then the high friction is obtained. If lining of brake pads or surface of disc rotor is uneven then area of contact will be less, which will affect the brake efficiency. 4. Tyres: The design of tyre also have a normal affect on the brake efficiency, the more the contact of tyre to the road surface the good will be the braking system. Worn tyres will have less braking action and will not allow vehicle to stop the required point and may also skid, braking action is found high in new tyres due to its more contact with the road surface. There are other factors which also play an crucial part in brake efficiency like aerodynamics, heat dissipation, weight of body etc., Causes of failure: The most commonly found causes for the brake failure are 1. Oil or grease on the brakes will cause failure as it interferes with the friction. If we found oil in brakes mean the oil seal has failed and is why oil is leaking. 2. Overheat of brakes to great degree, which will develop a hot spot on the rotor and drums. This spots will resist the friction from brake shoe and pads, therefore braking power is lost and brake fails. 3. Brake squeal which indicates the tear in the brake pads, by the time the brakes start making a grinding sound, they would have worn out past the pads to rotors. This will require to change more than just brake pads for new one, which will increase replacement cost as well. 4. Improper wheel alignment or disturbance in the steering system will also lead into the failure of brakes. Even if the mass of vehicle will get out of its range due to extra load will cause a brake failure due to the uneven load distribution. DISC BRAKE Introduction: Disc brakes came into existence in 1890s in England. But due to the poor state of roads and dusty conditions the disc and pads use to get rust and get wear, so the system got non-viable at that time. But later it was fully adopted in 1950s with new innovations in the previous design. Many companies started using it in their cars as it was better when to compared with drum brakes, the main reason as it has overcome the brake fade problem by providing the resistance to the brake components and overall performance is better when compared with drum brakes.   Disc brakes become popular in sports cars due to its braking performance. Now it has been common in commercial vehicles as well, as its used at front of the vehicles, as the front brakes perform most of the braking effort. Components: A disc brake assembly consists of a 1. Cast-iron disc (disc rotor) that rotates with the wheel. 2. Calliper assembly attached to the steering knuckle (operated mechanically or hydraulically). 3. Friction materials (disc pads) that are mounted to the calliper assembly. Operation: (Hydraulically powered) Disc brakes prove to be efficient when compared with drum brakes even the working principle is same for both systems. The basic principle of braking system The kinetic energy is converted into heat energy   When brake pedal is pressed, the hydraulic pressure is applied on the piston; it pushes the brake pad to get in contact with the disc. As the pressure increases the calliper pushes the outside pad to get in contact with the disc. Due the friction generated between pads and disc will create the braking force as the pads gets in contact fully with the disc rotor. But if we study the disc brakes widely, it shows that it does not use the much of the friction between the lining and rotor to increase the braking power as drum brakes does, they likely cause a pull between them. Disc brakes have constrained self-energizing action, there has to be sufficient hydraulic pressure to get the required braking force. The braking force can be increased by changing the size of calliper piston. Even less heat dissipation occurs as the friction surface is exposed to the air, which also reduces the braking fade.   Design of disc rotor: generally disc rotors are either solid or ventilated. The ventilated type disc rotor has cooling fins in the middle of the disc to ensure good cooling. Proper cooling ensures longer pad life and it also prevents fading. Some ventilated rotors have spiral fins which allow more air flow and better cooling. These fins are mounted on side of the vehicle and directional. Spiral fins are used in the front of the vehicles as front brakes take most of the braking action as more heat generates. Ref: https://pontiworld.com.au Design of calliper: The calliper are used as floating calliper or fixed calliper design, and these are mounted on the axle or attached to the wheel. Floating calliper type: The calliper are used as floating calliper or fixed calliper design, and these are mounted on the axle or attached to the wheel. this type of calliper requires less parts than the other type and its also less in weight and economical. Based on requirement it consists of one or two pistons. The piston is either side of the calliper. Hydraulic pressure from the main cylinder is generated and the piston thus press the brake pad towards the disc, then instantly an equal hydraulic pressure is generated at the other side and right brake pad pushed towards disc rotor and vehicle stops due to the braking force. Fixed calliper type: The calliper are used as floating calliper or fixed calliper design, and these are mounted on the axle or attached to the wheel. This type of calliper design has piston on both sides of the calliper, which provides the equal force to each brake pad. These fixed calliper types can set-up either one or two pistons on each side. The two pistons can generate a more braking force and a compact design, as these absorb and dissipate more heat, due to its size and weight. This design is capable for greater number of hard stops of short brakes without the effect of brake fade. Materials used for component: The material used for disc rotor plays an important role in braking force. The material should be tuff enough to stand on high pressures and high friction forces. Generally cast iron is used for disc rotor commercially, but ceramic discs are used for high-performance vehicles and heavy automobiles. Recent study shows that aluminium alloys also do a great job as disc. Now we will discuss in detail about the commonly used materials cast iron and aluminium alloys. Cast iron: Grey cast iron alloy is used for the manufacturing of disc rotor; it has superior properties and various advantages over other materials, as it best suitable for manufacturing and machining when compared with other materials which lead to the graphite lubricating the cut and breaking the chips. It contains 2.5%-4% of carbon and greater than 2% of silicon.   This material has good wear resistance and galling which leads to self lubricating due to the graphite flakes. The graphite microstructure of grey cast iron allows less shrinkage. The silicon percentage in the grey cast iron makes the material corrosion resistance and increases its fluidity when casting which also makes material easy to weld. Compared with other alloys of the cast iron, grey cast iron has low tensile strength , the good point about this material is the shock and impact resistance is almost doesnt exist. Here we will see the properties of the grey cast iron for ASTM 60, Tensile strength 62.5 Kpsi Compressive strength 187.5 Kpsi Shear modulus of rupture 88.5 Kpsi Modulus of elasticity ( Tension ) 20.4 - 23.5 Mpsi Modulus of elasticity ( Torsion ) 7.8 - 8.5 Mpsi Endurance Limit 24.5 Kpsi Brinerll Hardness 302 H_b Specific heat 447 j/kg deg Ref: http://www.engineershandbook.com Characteristics of Grey cast iron: Wear resistance: Grey cast iron works as excellent resistance to sliding friction wear, it is widely used for manufacturing of sliding components, most of the automobile components are made up of this item, its all because of the low coefficient of friction, resistance to the galling it has which is due to the effect of graphite flakes . This will help the disc rotor to withstand for high friction forces. Thermal conductivity: The important merit of grey cast iron is its high thermal conductivity, due to its flake graphite structure, heat dissipates occurs in material with good rate. This will increase the cooling of the disc rotor Machinability: Due to the ferrite graphite structure, grey cast iron is simplest and easiest alloys for machining and casting. This will make easy to get the typical designs of the disc rotor with spiral and fins Damping capacity: Grey cast iron has high ability to absorb vibration energy and also damping vibrations, which is due to the high percentage of the graphite flakes it has in it. It also has great property to resist high frequency vibrations. This will help disc rotor Aluminium Alloys: Aluminium is the important alloy of aluminium alloys, were the other metals are copper, silicon and magnesium. It has less tensile strength and low melting pointing. It has good casting characteristics due to its great levels of silicon (4-13%) in it. It is widely used as disc rotor due to its corrosion resistance.   But this is quite expensive when compared with cast iron. Though is in light in weight, has good electrical and thermal conductivity. It does also can be recyclable. All these properties brought a change in many industries to change their traditional materials i.e., aluminium alloys. Characteristics of aluminium alloys: Light weight: The best part of this material is its light in weight, actually its one third of steel in weight, due to its specific weight of 2.7 g/cm3. The more the energy consumed by aluminium the high will be the load capacity of the vehicle.   This will decrease the vibrations and also increases the brake efficiency due to its light weight. Properties of the aluminium alloys: Density 2600-2800 kg/m3 Melting point 660 deg Elastic modulus 70-79 Gpa Poisson's ratio 0.33 Tensile Strength 230-570 Mpa Yield Strength 215-505 Mpa Percent Elongation 10-25% Thermal expansion coefficient 20.4 -25.0 10-6 /k Thermal conductivity: its used in most of the high conductivity line like power transmission, it has twice of the copper in the properties, and its a good conductor of heat and electricity. This will increase the heat dissipation of the disc rotor. Ductility and recyclability: Due to the lower density and melting point, the material is considered as ductile, this will help to the complicated design, as we need in the disc rotor with spiral fins and groves for the air dissipation. Recyclability is also one great factor of aluminium as it consumes only 5% of the energy to melt it, and it doesnt affect its original quality of aluminium. Corrosion resistance: This is the main factor which made it to select for disc rotor manufacturing. It has a natural property of corrosion resistant as it surfaces form an oxide coating on it. While using as disc rotor further surface treatments like lacquering and anodising are done to increase its resistance towards corrosion. Major problems with Disc Brakes: The disc rotor of Disc Brakes is more exposed to the air, due to which there are very frequent chances of getting damaged. Usually this damage of disc rotor is explained in four common ways warping, cracking, rusting and scarring. Few a times the damage takes the disc into the unsafe area then the new disc is replaced with damaged ones. But sometimes using simple machining and other process this damages can be overcome. As scratches or damage on disc rotor can be removed by removing the thin layer on the disc on lathe machine if after that the thickness of the disc falls in the safe dimensions for the braking force. Warping: This is caused due to the excessive heat of the friction area of the disc rotor, due to excessive shorthand braking, uneven cooling of disc may also causes warping. If braking pads get into contact of disc excessively this will lead to warping after certain times, this warping is most commonly found in the racing cars as brakes are used very frequently due to speed and used at high gear times. There are few methods which can avoid the warping, braking at lower gear which will help to reduce the braking load on the brakes, and less heat is generated. The more the braking load, the more the heat generated and more the chances of improper cooling to take place. Changing the disc design with more fins can few times avoids warping. Improper installation of disc rotor may also leads to the warping as only the overwhelmed disc will come in contact with the brake pads. Cracking: This is found mainly in the drilled disc. Cracking occurs mostly around the edges and holes of the disc, due to the uneven expansion in severe environments. As the uneven expansion take place and the braking load varies every time the brake is applied which will lead to the cracking. And in several situations the disc will fail and no possible repair can be done. Even cracking can be overcome by maintaining proper the cooling of the disc and proper heat dissipation. If cracking is become severe then there might be a chance to replace the disc rotor. Rusting: This is found in the vehicle which are not used for period of time, the regular use keeps the friction area clean, but when not in use the friction area and slots get rusted and it reduces the braking power, due to which the strength of the disc also falls down and at this conditions disc should replace with new one. Scarring: Scarring occurs if something hard gets in contact with the disc while moving, which forms a hard spot on the disc, which reduces the braking power and weakens the brake. Generally this happens when the brake pad service life come to end and still its attached to the brake set-up then the steel support of the brake pad get in contact with the disc which creates a hard scratch. These scratches will form black slots when a vehicle come in use, and reduces the structure strength. This can be avoided by regular checking of brake pads checking life of the friction layer, machining the disc to remove the layer on surface of disc which removes the scratches. There are few phenomenal problems which has been a challenging task in braking department like brake squeal, brake judder and brake dust. These problems can be dangerous when they get on excessively. Change of design, material, brake assembly setup all these have been checked extensively to find out the perfect solution for these problems, this project is undertaken based on this problems. Lets discuss in detail about these problems and what are the methods being simplified to overcome it. Brake Squeal: squeal mean noise, this brake noise is a vehicle system problem due to the regularity and severity. The noise generated is mainly because of brake and suspension components together. This is not considered as the main problem to the vehicle were performance is the initial objective, but its not so proper for the road use. This noise is mainly between the pad and disc during the braking. But squeal can also be combination of disc, calliper and brake pads. To avoid squeal under the braking condition is not so possible, if we are assuming brake to absorb very high energy inputs. Actually this brake squeal came into account when front wheel drive and metallic brakes arrived. These metallic pads are harder than asbestos counterparts, and thus more squeal is observed if there are more irregularities and roughness on the rotor surface or if you found looseness between the pads and callipers. Few types of calliper designs are more noisier, if the pads of this callipers are not fitted so tightly and the calliper itself move around when brakes are applied. The more the brakes play the more are the chances of noise. Fixing the squeal problems in wrong way can lead to the squeal more worse. Brake squeal also occurs due to vibration of brake pads towards the disc rotor when vehicle is moving at low speed, this may not affect the braking performance much but will lead to the replacement of brake pads, this is very common problem which most of the vehicles are facing now.   Lot of methods are used to reduce the level of noise,   simple methods like having chamfers to the linings, applying grease between the pads and calliper, adding the brake shim between   the brake back plate and brake pads etc., these may help in some way to reduce the noise. Ref: http://www.aa1car.com/library/bsqueal.htm While using the methods to reduce the brake noise, have to assume the vehicle suspension system which acts more on the braking system, but at the end the squeal is avoided by trial and error method. Although we see an efficient improvement in understanding the actual reason for the brake squeal, it has been difficult to solve it. It was easily verified through the design and study to overcome the squeal, but it was different case practically. The failure was mainly caused because of the dynamic behaviour of the braking system and due to the gap between braking components. The easiest way was using high temperature