5 Things We Wish Wed Been Told When Starting College

5 Things We Wish Wed Been Told When Starting College 5 Things We Wish We’d Been Told When Starting College Starting college can be tough. You’ve got new ideas to wrestle with, new friends to make, and you have to get used to looking after yourself. Here are 5 things we wish someone had told us when we first started college. 1) Don’t Buy Books! You might have been told to go out and buy all the books on your reading list, but this isnt usually necessary. Any college library worth its salt will have plenty of the required books. Just make sure you get there before the other students snap them up! And if you get really stuck, you can always get cheap hand-me-downs from last years students. 2) Choose One Club It’s really easy to get sucked into signing up for 10 clubs in the first week at college. Sure, archery, salsa dancing, the Russian food club and white water rafting all sound great, but will you really have the time? Better to wait a few months before buying any expensive equipment to make sure you are really committed, rather than spending loads of money on a wetsuit and sailing shoes in your first week only to use them about four times. 3) Start Writing Your Papers Early It’s so tempting to put off writing a paper until a week before it is due. However, you’ll save yourself a lot of stress and time if you start writing as soon as the title is set. If you get into the habit now, you’ll be an expert when you get into your final year. 4) Save the Introduction until Last Another great writing tip is, once youve planned your paper, to skip writing the introduction until last. This will help you help you write a really strong opening, since youll have a much better sense of what the paper is about. 5) Take it Easy on the Drink College is a time for partying, sure, but you will find that relentless drinking will take its toll sooner than you think. There’s so much to get used to in your first year of college, so it’ll be a hell of a lot easier without a constant hangover! Try alternating alcoholic drinks with soft drinks and having a few alcohol-free nights a week. It’ll help you stay emotionally balanced and make life much easier!

SAT Writing Prep The Best Methods and Strategies

SAT Writing Prep The Best Methods and Strategies SAT / ACT Prep Online Guides and Tips I’ve spent the past decade teaching SAT prep classes and helping hundreds of students prepare for the SAT Writing section. After taking my class, many of my former students were able to improve their SAT Writing scores by more than 200 points. My experience has taught me that having a disciplined, focused approach to your SAT prep will allow you to maximize your score. In this article, I have given you the best advice I have for preparing for SAT Writing. Using these methods will enable you to use your study time wisely and master the skills you need to be an SAT Writing superstar. I tried to arrange these tips by how important they are to acing SAT Writing. However, these are all crucial tips for SAT Writing success, and you need to follow them all if you want to fully prepare yourself. #1: Learn the Grammar Rules that the SAT Tests SAT Writing is primarily a grammar test. Knowing the grammar rules that appear on the SAT isthe most important way to prepare for SAT Writing. On the PrepScholar blog, we have written articles covering all of the grammar rules and errors that repeatedly appear on the SAT Writing section. Here they are: Subject-Verb Agreement Verb Tense and Forms Pronoun Agreement Pronoun Case Wordiness and Redundancy Idioms Run-On Sentences/Sentence Fragments Parallelism Faulty Modifiers Adjective and Adverb Errors Illogical Comparisons Relative Pronouns Word Choice/Diction You should focus your studying on the rules that are more commonly tested. We have written a post on the distribution of appearance of the grammar rules on SAT Writing (coming soon). For those of you striving for a highscore, you need to have a firm grasp on all of these grammar rules. And learn them. And understand them. #2: Do Tons of Practice Problems and Understand Your Mistakes If you want to do the best you can on SAT Writing, you have to put in the time. Doing tons and tons of practice problems will make you more confident with the material. You'll be able to recognize grammar errors more quickly and avoid falling into common SAT Writing traps. Frankly, there's a lot of SAT prep material out there that isn't good and will be of minimal help to you. The practice questions you're doing should be representative of the questions you'll find on your SAT. We've identified the quality material so you won't waste your time. To spend your time wisely, you want to do practice problems that are likely to resemble those you will encounter on the SAT. Practice with official SAT tests and make sure you're using the best books to prep for SAT Writing. Check out these articles on where to find the best SAT Writing practice tests and the best SAT prep websites you should be using. Additionally, PrepScholar has over 1500 practice problems customized to each skill. However, simply doing practice problems is not enough. Why You Need to Understand Your Mistakes While doing a bunch of practice problems will help you prepare for SAT Writing, if you keep repeating the same mistakes, your score is not going to improve. You need to understand why you're getting certain questions wrong so that you can reduce your weaknesses and raise your score. One of the most common mistakes students make in their SAT preparation is that they don't take the necessary time to comprehend their mistakes and figure out how to correct them in the future. Understanding your mistakes can be more difficult than just doing practice problems, but it's essential if you want to keep improving your SAT Writing score. How to Understand Your Mistakes Fully understanding your mistakes takes diligence and organization. Here is the process that I recommend to grasp why you made each mistake and how to improve for the future; this process is somewhat rigorous, but it's also the best way to prepare for SAT Writing: On every practice test or question set that you take, mark every question that you're even 20% unsure about. When you grade your test or quiz, review every question you marked or answered incorrectly. This way you'll be reviewing all your missed questions and the questions on which you were able to guess correctly. On your computer or in a notebook, write down the gist of the question, why you missed it, and what you'll do to avoid that mistake in the future. Create different sections for each grammar skill and put the question in the appropriate section. Try to determine why you got questions wrong on your own. However, if you're having trouble figuring out your mistakes, the College Board website has an official test with explanations. Also, Khan Academy has helpful explanation videos for some of the questions on this test. Take notes on what you specifically missed and how to improve in the future. Be as specific and as thorough as possible. For example, don't just write that you missed a subject-verb agreement question and need to do more subject-verb agreement questions. Write down how the subject-verb agreement error was presented. Was the subject placed after the verb? Did you get confused by an interrupting phrase? What resources will you use to fully learn this rule and address your weakness? Don't just take notes on your content issues. Also, write down any information about your careless mistakes and what steps you'll take to prevent making them again. Do you need to read the question more carefully? Do you need to look at the answer choices more closely? You want to really dig into why you're missing questions and focus on specific ways to improve. #3: Identify Your Weaknesses and Drill Them If you do a thorough job of categorizing your missed questions and taking notes, you should be able to identify your weaknesses. When you notice patterns to the questions you miss, find extra time to practice the areas where you're struggling. Maybe there's a specific grammar rule like illogical comparisons or parallelism that is causing you problems. Do extra content review and practice problems related to those rules. The best SAT prep books and websites will have real or realistic SAT practice problems for each specific skill that is tested on SAT Writing. (We obviously believePrepScholar qualifies, and it'sdesigned to customize your SAT prep to focus on your weaknesses.) Furthermore, you should keep going over all of the questions you missed and marked. By focusing your studying on the areas where you're having the most difficulties, you'll be using your time most efficiently. Spending the majority of your time practicing stuff you already know is not an effective use of your time. Strengthen your weaknesses! The following tip relates to the approach you should use to answer SAT Writing questions. #4: Practice Relying on Grammar Rules to Answer Questions Don't rely on what sounds right to answer SAT Writing questions, except on idiom questions. Many of the SAT Writing sentences are lengthy or use uncommon phrases. The sentences might sound odd to your ear, but that doesn't necessarily mean they're wrong. Similarly, some of the sentences contain grammar errors that are so common that these sentences are likely to sound fine to you. As such, it's vital that you practice approaching the test from a logical standpoint. Every time you answer a question, you should be able to justify your choice with a specific grammar rule. Here's an example of how you would rely on grammar rules to answer SAT Writing questions. The explanation I give to the question is similar to the thought process you should use when answering SAT Writing questions. Now, take a look at this question from a real SAT: Frequently on tour, a band called the Chieftainsrevered internationally as spirited performers oftraditional Irish music. (A) revered internationally as spirited performers (B) revered internationally and they are spirited performers (C) is revered internationally for its spirited performances (D) is revered internationally as giving spirited performances (E) are revered internationally as being spirited performers Explanation: When I first read the sentence, I immediately noticed that it does not express a complete thought. It’s a sentence fragment. The word â€Å"revered† is used as a participle and not a verb. I assumed that the correct answer would add a verb to fix the sentence fragment. Immediately, I eliminated answer choices A and B because they don’t fix the sentence fragment. Then, I had to determine whether to use the singular verb â€Å"is† or the plural verb â€Å"are†. Because the subject is â€Å"band†, which is singular, the verb should be in the singular form. I eliminated E because that would be a subject-verb agreement error. Answer choice D is incorrect because â€Å"as† is the wrong word. This is an idiom error, the only type of error in which you may have to rely on your ear for what sounds right. The correct answer is C. The sentence fragment has been corrected, the subject and verb agree, and â€Å"for† is the correct preposition to use in this sentence. When you're doing practice questions, be able to explain and justify your answer choices with your knowledge of SAT grammar. #5: Determine If You Have Time Management Issues. If So, Address Them How To Determine if You Have Time Management Issues Find an official SAT practice test, and take only the Writing sections. For each section, use a timer and treat it like a real test. If time runs out for that section and you're 100% ready to move on, then move on. If you're not ready to move on, keep on working for as long as you need. For every new answer or answer that you change, mark it with a special note as "Extra Time." When you're ready, move on to the next section, and repeat the above until you finish all Writing sections. Grade your test using the answer key and score chart, but we want two scores: 1) The Realistic score you got under normal timing conditions and 2) The Extra Time score. If the difference is more than 4 raw points, then you need to address your time management issues. How To Improve Time Management Issues Generally, time management improves as you become more familiar and confident with the content. If time management is a lingering issue for you, monitor your time spent per question. You should have a target time of 45 seconds foreach improving sentences question and 30 seconds for each identify the error question. No question should take longer than 1 minute. When you're doing your practice questions, keep track of how long you're spending on each individual question. Focus on finishing each question in the target time. For my final tip, I want to remind you about the shortest subsection on SAT Writing. #6: Don't Forget Paragraph Improvement Because there are only 6 paragraph improvement questions on each SAT, you should spend the majority of your time preparing for the sentence improvement and identify the error subsections. However, make sure you practice paragraph iprovement questions as well. Some paragraph improvement questions are similar to improving sentences questions, but others are unique to this subsection. Here are the major types of questions you will find on paragraph improvement: Macro Logic: how paragraphs relate to each other and to the main idea Transitional Logic: how sentences and ideas connect to each other Redundant Sentences: whether sentences or ideas are extraneous and can be deleted Conciseness and Style: how to choose words to express ideas succinctly and clearly When you practice paragraph improvement questions, you should use the same approach as for the other two subsections. Categorize your mistakes, take notes on why you made mistakes and how to improve, identify your weaknesses, and then spend extra time improving those weaknesses. Review this article on how to approach paragraph improvement. If you make a commitment to following the six tips I just gave you, I guarantee you'll be giving yourself the best chance to succeed on SAT Writing. Whenever your motivation starts to wane, think about your goals and why you want to do well on the SAT Writing section. What's Next? Review the article on how to get an 800 on SAT Writing. It offers more depthsome of the methods I presented in this post. Also, you'll want to check out the articles on my top study strategies and test-day tips for SAT Writing success (coming soon). Want to improve your SAT score by 160 points? Check out our best-in-class online SAT prep program. We guarantee your money back if you don't improve your SAT score by 160 points or more. Our program is entirely online, and it customizes what you study to your strengths and weaknesses. If you liked this Writing and grammar lesson, you'll love our program.Along with more detailed lessons, you'll get thousands ofpractice problems organized by individual skills so you learn most effectively. We'll also give you a step-by-step program to follow so you'll never be confused about what to study next. Check out our 5-day free trial:

Portfolio Essay Example | Topics and Well Written Essays - 1000 words - 1

Portfolio - Essay Example The topic on the selling of human organs is of importance due to its emerging and contentious nature. Several questions have arisen from the point of view that organs are being sold, raising both heath and ethical concerns. The American history is also of major concern considering the need for our generation to understand where our country has come from and get to understand the differences and similarities between then and now. The three essays I wrote revolves around these two major topics, here I will explain in detail my findings and the positive and negative remarks that I have established as I review them. Following an article on the ‘Capitalism Magazine’ by Holcberg about the issue of human organs being predestined for sale, I developed a deep interest to review the topic so as to present Holcberg’s thoughts systematically. I found the report raising very serious concerns about legalizing of selling of human organs. I clearly articulated his concerns while presenting the facts that he had considered. My introduction was very captivating and captured the concerns at a first glance. The reasoning behind the article was not based on my own thoughts but that of the author. The topic limited me to the thoughts of the author; an aspect that I believe brought some biasness in the article and made the topic narrow instead of taking the broader perspective of capturing the opinions of many. However, the brevity and the systematic articulation of my points made the essay to read and comprehend. Several improvements to the article could have made it more interesting and more informative. I only focused on an individual have thought that was a challenge; this could have been enhanced by considering not only the opinion of others but also could have reviewed some literature on the topic. Another challenge was in the way I presented my work, all the points I presented them in one long paragraph. This could have been improved by articulating my poin ts in individual short and precise paragraphs. It is apparent that the paper limited use of my own thoughts an aspect that made me as the writer to be a reviewer and had no opportunity to put across a personal opinion, especially because the topic had been of concern to me. Grammatical errors and poor sentence structure also prevailed in my work; an aspect contributed by the fact that I did not take time to edit my work, I learnt a lesson and has decided that next time I will be keen to recheck. My second essay was geared towards giving a summary of the Krugman’s article that was published in the New York Times focusing on the similarities and differences between the America we had at independence and today. I presented the reasons for his argument as presented in the media. The thoughts were analyzed taking into concern the key points that outstand when comparing the state of the country at the two different times. All the information was presented in one paragraph since the y were direct and self-explanatory. However, the narrow presentation was evidenced by the regard of Krugman’s thoughts only, without having a point of view from other individuals. My opinion of the situation influenced the summary, such that I was prompted to think against the arguments of the author. However, to restrain myself from his facts and opinions I had to break down the arguments into points that he had mentioned. This facilitated the development of a summary in a great

Looking at Los Angeles from a Dance Perspective Research Paper

Looking at Los Angeles from a Dance Perspective - Research Paper Example   Participants of the dance across disciplines manipulate spaces of their creative and innovative practices that form a network of merging societies. In the Los Angeles dancing culture, the society tends to shape their bodies, societal locations, and fashion identification and lay the basis and grounds to choreograph1 the urban relations. The culture has focused on these protocols where the professionals and amateur understand their stand as agents and creators within their community. The goal of this is to reframe the training scenarios, audience, and performance in the casting of daily practices. The role of dance and performance is to come up with civic infrastructure and position dance as one of the deliberate techniques to place urban making. Therefore, the cultural spectrum of Los Angeles comprises of centers and sites for dancing. The dancing culture is significant since is shaped the environment accordingly. The dancing culture has come to navigate the complex and a ceremonious diversity that features the city. The dancing culture in Los Angeles is a spiritual, political, and social frameworks acting as an archive that preserves the past and looks into the future. For instance, the Pilates training has a duality perspective where the associated techniques are considered as a disciplinary project and their connection of alibi. In Los Angeles, the intimacy of Alibi is gotten from the shared understanding of the physical limits, metaphors in organizing the body.  

Ethics of selling body parts Research Paper Example | Topics and Well Written Essays - 1250 words

Ethics of selling body parts - Research Paper Example There are many avenues both legal and illegal that human body products can be sold through. According to () the amount of money one receives for trading in human body parts is in proportional to the risk involved. This source of income can be tapped again and again. The global trade in organs opens a large market worldwide with both legal and ethical issues. Being a living laboratory compared to no other laboratory known it can produce products such as Kidneys, blood, ovum, sperms, hair, also prostitution is said to be trade in human body parts and others such as surrogacy. These body parts are are sold through illegal and legal avenues. The human baby is made from a biological combination of sperm and ovum, thus there is no product made from scratch by factories. Good percentage of people who want children are unable to get hence they are helped by science but the important ingredients have to be used. Infertility science has improved so much such that it has developed into a multib illion ventures for entrepreneurs in this business. Buying of biological fathers has been made easier with the availability of sperm banks. A client chose a biological father depending on personality, education, ethnicity among many other factors; this is because when woman buys a sperm she is buying that mans medical history and genes. Screening is thorough in the legal markets for sperms. Ovum donation also referred to as egg donation, involves risks of infection and injuries to the donor, though it is a fifteen minute operation. But even with the modern invitro fertilization methods, many implanted embryos fail to hatch in the recipient’s womb. This technology enables women who are barren to get children.egg donors earn monthly for every months work, they can earn between $3000-$8000 dollars a month, but this is not a task for the squeamish. Man’s obsession with beauty has opened a large market for hair business. There are options for auctioning ones hair. Hair trad e is a multimillion dollar business and probably hair is the easiest body part to harvest and even to sell, depending on the texture of the hair. Prostitution is the oldest trade in human body parts that is practiced the world over but this is a service product. Other human body parts traded in are, the kidneys and the heart, which are done through kidney and heart transplant respectively, it involves a lot of risks to both the donor and the recipient hence it is very expensive for the recipient. for the heart the donor cannot remain alive hence it has not gained popularity because it is 100% risky and very expensive for one to afford .it is not like kidney transplant where the risk is not much since only one kidney is removed. Others like surrogacy involves provision of raw materials for human life, the only body parts sold here the hormones responsible for baby formation, maintenance and renting of the womb. The surrogate mother undergoes a grueling experience for nine

Anti Jerk Control Of Hybrid Electric Vehicle Engineering Essay

Anti Jerk Control Of Hybrid Electric Vehicle Engineering Essay The report details the review done in the area of anti-jerk control of vehicles. It explains the phenomenon of driveline oscillations excited due to torsion of driveline at high engine torques causing unwanted longitudinal oscillations in vehicle body. Report starts with a broad introduction to the topic and lays down the aims and objectives of the research project. The aims and objectives of the project are to design an active feedback control for an electric motor of a hybrid electric vehicle to damp these undesirable oscillations. A summary review of previous research work done in this area is presented which defines the starting point of the project. Different techniques used for anti-jerk control in conventional vehicle are discussed. Basic approach to model based control design is presented in the report. An introduction to hybrid electric vehicle driveline and description of its components different from conventional vehicle is shown. The report also lays down the procedure of the work to be followed for the research project with a project plan. INTRODUCTION The increasing pressure of protecting the natural environment and to decrease the dependence on non-renewable sources of energy has encouraged vehicle manufacturers to develop more clean and efficient power systems. As a result Hybrid vehicles are hot topic for research among vehicle manufacturers. Efforts are being made to make the vehicles more fuel efficient with high performance and minimum CO2 emissions. Diesel hybrids are considered as next big thing among ecological designs since diesel engines are 20 % 30% more fuel efficient than their petrol counterparts. Nowadays noise, vibration and harshness (NVH) issues have become more important for a customer such that there are very stringent requirements for noise or vibration in a vehicle. Driveability of a vehicle is majorly impacted by NVH problems and is strongly felt as vehicles performance during various manoeuvres such as acceleration, braking, gear change etc. Thus vehicle manufacturers and OEMs have realized the importance of NVH issues and target to identify the root cause of vibration and incorporate the correcting measures at early stages of manufacturing with a main goal to refine the ride and driveability of a vehicle. These days efforts are being made to increase the performance of vehicles and to make them more fuel efficient by using different techniques and one of the techniques is electrification of various systems in a vehicle. Electronic power assist steering system, electric active roll control, electronic differential, brake by wire are some of the examples of electrification of vehicle systems. This kind of methodology becomes more evident in case of hybrid electric vehicles where electric power components including power electronics are integral part of the powertrain. It has been observed that using these electrification techniques not only helps in increasing the performance of the vehicle but also makes them more fuel efficient. Thus the electrification in a diesel hybrid powertrain to improve the driveability of vehicle forms the main platform for this research project. Problem Statement One of the major NVH issues in automobiles is torsional vibrations of driveline. The torsion of drivetrain at high engine torques causes oscillations in driveline. These oscillations are generally excited by various sources such as rapid or sudden load/torque change, gear change and unevenness of road surface. These oscillations cause longitudinal acceleration in vehicle structure and passenger compartment of the vehicle, which reduces the comfort and driveability of the vehicle and are experienced as unwanted jerking by the driver and passengers. These type of driveline oscillations are termed as Jerking, which is the main focus of this research. The high engine torques at low engine speeds makes this phenomenon more common in modern diesel engines. A sudden/abrupt pressing or releasing of accelerator pedal by the driver causing a rapid increase or decrease in engine torque called as tip-in and tip-out respectively, which gives rise to oscillations between frequency range of 2 10 HZ. To reduce these oscillations and to increase the comfort and improve the driveability of vehicle some kind of anti-jerk control is required. In conventional diesel engine vehicles, active control of engine fuelling and drivers torque demands and passive utilization of mechanical isolators such as dual mass flywheel (DMF) are used to permit feed forward active and passive damping of these oscillations. Aims and Objectives The aims of the research project are to investigate the phenomenon of jerking in a diesel hybrid electric vehicle and to electrify the anti-jerk control using the electric motor of hybrid vehicle to damp these oscillations. The aims of the project would be realized through following objectives: A feed forward approach in modeling the vehicle driveline to investigate driveline jerking using SIMULATION-X. The response of vehicle during tip-in, tip-out, idle and coast conditions would be studied. To design an active feedback control for electric motor of the hybrid vehicle to permit active damping of the investigated driveline oscillations. To analyse its effects on fuel consumption, comfort and sportiness of the vehicle and comparison with conventional anti-jerk control methods. To study the impact of passive damping of these oscillations using DMF in the driveline. Due to the diverse nature of the project the work has been divided between two students. It was decided that modelling of the driveline will be done by Pavan Mukkamala and Kamal Shamnani will take care of control design part of the project. Report Overview As it can be seen before, the report begins with the introduction to the current scenario of hybrid vehicles, driveability and electrification of vehicle systems. Then problem statement was defined followed by aims and objectives. The next chapter would summarize the undertaken review to understand the research work beginning with analyses of jerking. The literature review also serves as the basis to provide the expected response characteristics. It also explains the different control methods used on a conventional diesel engine vehicle. Chapter 3 lays down the outline of the procedure to be followed for the research project along with project plan. Conclusions based the literature review have been made in chapter 4. LITERATURE REVIEW Driveline Oscillations Different type of powertrain configurations (front wheel drive or rear wheel drive), engine type and dynamic response, engine torque at different engine speeds and vehicle mass excites different kind of oscillations in vehicle driveline. These oscillations have been summarized below [1]: Torsion of shaft causes jerking and pitching type oscillations in the driveline. Jerking then causes longitudinal acceleration of car body in a frequency range of 2 5 Hz. The pitch motion frequency is about 1 2.5 Hz. Engine movement and engine mount characteristic excites oscillations in a frequency range of 15 200 Hz. Gear box housing cause oscillations in the frequency range between 50 and 80 Hz. Combustion process, movement of pistons inside the cylinder and engine speed causes oscillations depending upon type of engine, number of cylinders and engine speed. Inline-four cylinder engine types engine exhibit large cyclic fluctuations of torque at idle speed. Driveline Jerking in a Diesel Engine Vehicle The fast response and high torque of modern direct injection diesel engines results in sharp and large changes in driveline torque. Moreover smaller and more powerful modern diesel engines with reduced flywheel inertias and reduced mass of powertrain components reduce the initial response to transient throttle demands by the driver. But on the other hand faster response and large changes in driveline torque make them more susceptible towards generation of driveline oscillations. These types of oscillations are commonly referred as driveline jerking, surging, driveline shuffle, driveline judder, jerk oscillations or bonanza effect. [2], [3] and [4]. These oscillations are generally excited due to the torsional vibrations of driveline when accompanied with sudden torque change. The sudden driveline torque change can be described as tip-in and tip-out manoeuvres. The tip-in and tip-out behaviour are described in figure-1 as a step input and after few seconds a step back to zero [2]. The tip-in and tip-out behaviour causes oscillations to engine speed. The difference between engine speed and wheel speed is generally used to describe the torsional oscillations of driveline shown as torsional speed in figure-2-1. These oscillations are transmitted to the vehicle body from wheel and tire and cause oscillations in vehicle longitudinal acceleration. The oscillations in longitudinal acceleration of vehicle body are shown in figure-2-2. The acceleration of vehicle body oscillates between the frequency range of 2 and 5 Hz. The observed frequency of oscillation is dominated by drivelines first natural frequency. This frequency lies between the resonance frequencies of various sensitive human body parts such as shoulders (4 6 Hz), stomach (4- 8 Hz) and trunk (3 6 Hz) [5]. So, these different body parts may resonate due to this jerking and hence very unpleasant for drivers and passengers. Figure 2: Effect of Tip-in and Tip-out on Engine and wheel speed [2] Figure 2: Body acceleration during Tip-in and Tip-out [2]. The phenomenon of jerking is more common where the manual clutch is not present, as a human driver uses manual clutch to reduce these vibrations. Whereas in automatic clutch units the design philosophy is to reduce the clutch engagement and disengagement time to prevail smooth torque transfer which gives rise to driveline oscillations. These oscillations differ at different gear ratios. It has been shown that oscillation frequency increases shifting from first gear to higher gears due to change in damping co-efficient associated with each gear and reflected engine inertia [6]. Generally driveline shuffle is also associated with phenomenon of clonk or gear rattle. Clonk is basically a noise which is a by-product of backlash present in gears. Backlash is allowed to incorporate operating clearances and manufacturing tolerances. The clonk can be reduced by increasing the driveline compliance but side effect of increasing compliance is the increased driveline oscillations hence jerking. Anti-Jerk Control of Conventional Vehicles The main parameters which govern the severity of jerking response of vehicle can be termed as engine torque rise rate and driveline compliance. Anti-jerk control acts as the balance between comfort and sportiness of the vehicle. The reduction in driveline oscillations is possible by controlling the engine torque rise rate, which can be done by smoothening of drivers torque demands. In a conventional diesel engine vehicle it is done by electronic fuelling control and in a petrol engine vehicle it is done by using spark advance and electronic throttle control. Various manufacturers use the filtering of drivers torque request but this becomes of no use when oscillations are excited by ground roughness. In practice, anti-jerk controller parameters are experimentally optimized to combine comfort and sportiness of the vehicle [2]. The parameters are tuned and accessed, to include non-linearities present in the system, by using various test-runs to find optimal controller parameters. All these parameters are stored in form of different maps and relationship between different engine parameters which are then used to obtain a feed-forward controller for the vehicle. The reductions in driveline oscillations in conventional drivetrain are possible by various active and passive methods. These include: Optimizing driveline parameters such as compliance of clutch, driveshaft and transmission, gear ratios and inertia of driveline components. Passive reduction of oscillations by adding damping to the system. Active control of engine torque. Model Based Anti-Jerk Control In past these parameters were obtained by using trial and error methods which may not be fully optimized and this strategy takes a lot of time depending upon the knowledge of automotive engineer [2]. These days as explained above that optimal anti-jerk control parameters are obtained experimentally by systematic and standardized computer aided test runs. This procedure still relies on time-consuming test runs. Whereas use of simulation can help in analytical assessment of a large number of performance, driveability and comfort parameters with reduced costs and less risk of testing. Simulation can determine highly optimized and accurate system parameters out of which only few parameters are required to be checked by real tests which save a lot of testing time. Due to this a lot of emphasis is given on use of simulation to obtain the optimal controller parameters and also if possible integration of model based controller in the vehicle is also being considered. A review of model based controller design approach is shown below. Modelling techniques Driveline of a conventional diesel engine vehicle is made up of an internal combustion engine which is connected to a gearbox through clutch whose output is connected to driveshafts which transmits torque to the wheels. In model based controller design gray-box approach is used to model the drivetrain. According to which driveline can be modelled as lumped parameter model which is made up of rotating bodies with lumped inertias, compliances, damping losses, input torque and load torque through environmental forces [6]. Even a complete linear state space model based upon this relatively simple transformation of driveline is of 14th order which is very complex and requires very extensive computational resources to run on a real time engine ECU and is therefore very expensive and cannot be implemented for mass production [4]. Structure of a complex rear wheel drivetrain is shown in figure -3 [4]. Figure 2: A rear wheel drive vehicle driveline structure [4] Thus it is required to define a reliable and low order linear representation of overall driveline dynamics. Since the purpose of anti-jerk controller is to damp the oscillations at drivelines first resonance mode, some approximations can be made to reduce the model complexity. To simplify the model it can be assumed that driveline oscillations at first resonance mode are caused due to torsion of drive shafts which can be explained as they are subjected to relatively highest torque since the torque from engine is amplified by the transmission and final drive [1], [7]. Clutch due to its higher stiffness can be considered as not contributing to first resonance mode. All these assumptions can be justified by measurements [1], [7]. This reduces the driveline model to a 2nd, 5th or 7th order depending upon the type of drive configuration and flywheel. For a reliable and accurate design of a model-based controller identification of model parameters is done on basis of measurement data. To incorporate the non-linearities present in driveline the values of parameters depending upon engine speed can be stored in form of look-up tables resulting in time-variant model which is more accurate and reliable [1], [7]. Different techniques such as least square optimization and extended kalman-filter can be used to optimize the non-linearities present in the system to reduce the error. The model can be validated by comparing the simulation results with real behaviour of the car. Controller Design In a model based anti-jerk controller design the controller is used in a feedback path. Here also different methodologies have been used to design the control strategy. One of them is to use the model to obtain the controller parameters. Thus in this case model based controller design approach is used to assist the engineer and to save time on testing [2]. This type of control topology is shown in figure 2-4 [2]. Figure 2: Model based designed controller structure [2] In this type of control architecture a two step procedure is used to damp the driveline oscillations first the requested driveline torque Tin is filtered to prevent jerking generation and then the feed-back controller minimizes the jerking further. State of the vehicle can be the feedback to the controller which can be engine speed, wheel speed, and vehicle speed etc, based on which variable controller parameters will be chosen from predefined maps. Advantage of this type of control structure is that it can be used to compensate for the disturbances from the ground roughness. The other advantage of this type of control strategy is that it requires only controller variable parameters to be stored in the ECU of the engine which will be extracted by two performance criteria i.e. sportiness of vehicle demanded by the driver and level of comfort required through no longitudinal oscillations [2]. The disadvantage of this type of controller is that it needs to store different parameter valu es for different gears and operating points which require the experience and knowledge of automotive engineer to adjust parameter maps. Also it may require some feedback of vehicle states from the vehicle which may be difficult to measure in a vehicle. Also the adjusted parameters values for comfort and sportiness will depend upon the subjective preferences of the engineer. A field of research in this case is the invention of tuneable factor between sportiness and comfort which enables customers to tune their car to their requirement [2]. Another approach in model based controller design is the predictive approach i.e. a reduced model of vehicle drivetrain will be included in vehicle ECU which will reproduce the occurrence of jerking before its actual occurrence and output of which is used as controller input which will then avoid jerking before its occurrence [1] , [7] and [4]. Figure 2: Model based predictive control structure [1] The dead time or the time delay due to engine combustion events is separated from dynamics of process and modelled separately at the end of model which makes the response of the model faster than actual vehicle [1], [7] hence enables the accurate reproduction of oscillations before their occurrence. Structure of a predictive model based controller is shown in figure 2-5 [1]. These types of controllers are generally equipped with an observer which incorporates the external disturbances such as ground surface roughness and compensates the model inaccuracies by including a feedback between model output and actual process output [1] and [7]. The response of observer is faster than that of the process to make the steady state error zero after a short period of time due to this its design is done separately and values for different engine speeds and demanded torques are stored in form of look up tables. Root locus method is used for designing these kind of controllers. An advantage of usin g this type of controller is that less dependence on automotive engineer to adjust parameter maps. However an appropriate compromise between comfort and sportiness needs to be defined. One of the ways to increase sportiness is to deliberately delay the activation of controller until initial vehicle acceleration. This type of method can give the user an option of different modes for example, sporty, everyday and comfort by changing the controller values [4]. It can also predict system states which are difficult to measure on a real vehicle hence a more accurate system response can be obtained. At the same time this type of controller can be very expensive as it requires significant computational resources added on to vehicle driveline ECU. Hybrid Vehicle Driveline A hybrid vehicle is a vehicle in which powertrain has more than one source of power, a hybrid electric vehicle (HEV) has an internal combustion engine and an electric machine/motor. HEVs powertrain can be classified as series or parallel hybrid systems. A series hybrid system is one in which electric motor provides all the torque required for vehicle propulsion whereas a parallel hybrid system allows torque input from either internal combustion engine or electric motor or from both. Hybrid electric vehicles are the most important topic of research for the past few years. A series hybrid vehicle driveline does not have a direct mechanical link between the engine and driveline. It is connected to a generator which in turn provides electric supply to power electronics. The electric machine/motor is connected generally through a single speed gearbox, final drive and drive shafts to wheels. Thus driveline oscillations in a series hybrid vehicle will be present, similar to a conventional vehicle. The main difference will be because of propulsion mechanism which is an electric motor. Regarding the anti-jerk control for a series hybrid vehicle, it can be done by active control of electric motor torque. It has been explained in a publication by Borodani and Ambrosio [3] in which an active robust control algorithm based on the Hà ¢Ã‹â€ Ã… ¾ control technique was designed for a Fiat Bravo 1600 cc for electric only mode. In a parallel hybrid vehicle driveline both engine and motor are mechanically connected to the wheels through clutch, an automatic gearbox and drive shafts. The vibration modes of parallel hybrid driveline are similar to a conventional vehicle. A similar strategy can be used to minimize the jerking as used for conventional vehicles in engine only mode. Whereas an active control of electric motor torque can also be used to prevent jerking. As there is not enough evidence of work done regarding the investigation of jerking and development of anti-jerk control for hybrid vehicles, this will be a topic of this research. Figure 2: Block diagram of hybrid drivetrain to be used Electric motor in a hybrid vehicle driveline gives an opportunity to electrify the anti-jerk control which then can be compared with conventional methods of anti-jerk control for fuel consumption, degree of comfort and sportiness of the vehicle. A parallel four wheel driven diesel hybrid electric driveline with dual mass flywheel (DMF) of a sport utility vehicle will be used to investigate the driveline oscillation and then to design an active feedback control for electric motor to damp these oscillations. Vehicle drive configuration can be changed to front wheel drive by unlocking the central coupler. The effect electric real axle drive (ERAD) will not be considered for anti-jerk control design. The driveline is shown in figure 2-6. Some important components of driveline and their effect are explained below: Integrated Starter Generator (ISG) As name suggests ISG replaces both conventional starter and alternator/generator to a single electronically controlled device. An ISG can convert electrical energy to mechanical energy to start an engine and also mechanical energy to electrical energy to power all electrical systems in a vehicle such as lights, air conditioning etc and to charge battery. An ISG serves three important functions start-stop, electricity generation and power assistance [8]. It allows engine start-stop functionality to save fuel instead of idling when vehicle is not in motion. ISG generates electricity from spinning crankshaft of vehicle to charge the battery. In a hybrid vehicle an ISG can provide power assist to the engine during the boost-mode. Although it cannot propel a vehicle on its own but it can assist the engine and can be used to store energy while regenerative braking. The ISG is generally used in mild hybrids. An ISG can provide retarding force on crankshaft to generate electricity during bra king; this feature of ISG can be used for anti-jerk control. Dual Mass Flywheel A dual mass flywheel [DMF] consists of two rotating flywheels [primary and secondary] connected by long travel arc-springs [7]. Figure -7 shows the structure of a basic DMF [4]. A DMF can be used to mechanically isolate the driveline oscillations arising from high speed engine oscillations by decoupling the transmission from engine. It filters out the engine irregularities completely. Due to the smooth operation of secondary flywheel and transmission input shaft gear rattle is significantly reduced. DMF can provide good vibration isolation at low engine speeds which in turn reduces the fuel consumption of a vehicle. Due to its excellent vibration isolation and damping attributes, DMF today is found in many vehicle drivelines including low budget cars [4]. But despite of its advantaged DMF increases the system complexity. DMF is basically a spring damper unit having highly non-linear characteristics. It can temporarily store energy due to which it applies a reaction torque on internal combustion engine and alters the engine speed signal which is used by ECU. It increases the probability of undesirable side effects such as jerking. Figure 2: Dual Mass flywheel structure [4] PROCEDURE Procedure of work Driveline vibration is mainly a problem of engine torque profile and compliances of components in the driveline. To study the effect of jerking in hybrid vehicles a model of driveline with all system complexities will be developed using a SIMULATION-X. The simulation-X model will be a complex model replicating the complete dynamic behaviour of the vehicle. As the frequency range of interest is 2-5 Hz, drivelines first natural frequency the model will be reduced according to a final model to be implemented for the design on controller which can accurately predict the oscillations in the desired frequency range. An active feed-back control for electric motor torque and for engine fuelling control will be designed by implementing the reduced model in MATLAB/SIMULINK. Then both controllers will be implemented in the actual complex model in SIMULATION-X to observe the system performance in terms of fuel consumption, level of comfort and sportiness. Simulation tool Simulation-X Simulation-X has been chosen to investigate the phenomenon of jerking for the project due to its very user friendly graphical user interface. This interface provides a very intuitive and efficient lumped parameter modelling approach for modelling dynamic systems. It can model various physical systems (i.e. Electronics, Mechanics, Hydraulics, Pneumatics, Thermal etc) with much ease. It also allows for the signal and equation based modelling ideal for control systems. Another important feature of Simulation-X is the ease of parameterization i.e. it is very easy to define the system complexities and parameters depending upon the requirement. It has numerous possibilities for visualization, analysis and recording a large number of results associated with each element of a model. It is very beneficial for modal analysis as it can easily extract the dynamics of system by showing the modes of vibrations and the cause of these resonance modes. This feature is very handy and useful for this r esearch project as it can be used to differentiate between the causes of oscillations in the driveline and thereby helping to reduce the model for the desired frequency range. Project Plan CONCLUSIONS On the basis of literature review it can be stated that the high change in engine or load torque excites oscillations in vehicle driveline, known as jerking causing horizontal acceleration in vehicle body. The frequency of jerking lies in resonance frequency range of various sensitive body parts as a result it is entirely undesirable by the drivers. Comfort and driveability issues raise the need for anti-jerk control. There has not been enough work done on anti-jerk control for hybrid electric vehicles since not many hybrid electric vehicles are available in market. Other than the conventional methods, electrification of anti-jerk control can be done in a hybrid electric vehicle which will be the main aim of the research project. A model based controller design approach can be regarded as efficient and reliable. It can assist an automotive engineer in deciding control parameters for the controller, also it can be implemented directly to vehicle for anti-jerk control by reducing the order of driveline model. Driveline oscillations can also be damped using passive damping methods such as using DMF which will be studied as a part of research project. REFERENCES [1] Kiencke, U. and Nielsen, L. (2005), Automotive Control Systems for Engine, Driveline and Vehicle, Springer, Berlin, Germany. [2] Grotjahn, M., Quernheim, L. and Zemke, S. (2006), Modeling Identification of car driveline dynamics for anti jerk controller design, ICM 2006 IEEE 3rd International Conference on Mechatronics , 1-4244-9713-4/06. [3] Borodani, P. and Ambrosio, C. (2002), Robust control of active damping of a hybrid vehicle driveline shuffle, MED2002 Conference. [4] Walter, A. Kiencke, U., Jones, S. and Winkler, T. (2008), Anti-Jerk Idle Speed Control with Integrated Sub-Harmonic Vibration Compensation for vehicles with Dual Mass Flywheels, SAE International Powertrains, Fuels and Lubricants Congress Shanghai, China, 2008-01-1737. [5] McDevitt, I. (2005), Torsional Vibrations of Vehicle Driveline, MSc Thesis, Automotive Product Engineering, Cranfield University. [6] Lee, H.C. (2006), Driveline vibration control of electric vehicle, MSc Thesis, Automotive Product Engineering, Cranfield University. [7] Baumann, J., Torkzadeh, D., Ramstein, A., Kiencke, U. and Schlegl, T. (2005), Model-based Predictive Anti-Jerk Control, Control Engineering Practice 14 (2006) 259-266. [8] Viorel, I., Szabo, L., Lowenstein, L. and Stet, C (2004), Integrated Starter-Generators for Automotive Applications, Acta Electrotehnica, Volume 45 Number 3 2004. [9] Reik, W., Seebacher, R. and Kooy, A. (1998), Dual Mass Fly-wheel.

Free College Admissions Essays: I Hated My Father :: College Admissions Essays

I Hated My Father I hated my father for a long time. I resemble him completely, and everyone says I am a copy of him in appearance. And some people even said that 30 years after, I would be what he was completely in everything. But I really disliked to be told so, and I felt it was an insult to me. My father was an object of detestation for me; to be his son was my curse. I didn't regard him as my father and despised him very much, so I sought ways of revenge on him. I decided that after I graduate from university and I can earn my own living, I would abandon him. "For now, I will act a meek son, but it won't last forever. He should live his lonely old age," I thought. There were many reasons why I hated my father. He was quick-tempered, selfish, and he easily beat and kicked me, because he wanted to have his own way in everything. Though I had not been such a bad child, I was often scolded and knocked about by him since I was a small child, so I was afraid of him, and I really had contempt for him. There was one more reason why I hated my father; it was my name "Taro", given me by my father "Taro" is a very simple name. Anyone naming a child could think of this name in one second. Of course, this simple name was made fun of by my friends. I really hated it, and I wondered whether my father had really thought my name over seriously. I asked him the reasons for naming me this, but he answered only "Taro is simple, manful, and easy to remember." I even wondered if perhaps my father thought of me as a dog. I seldom felt his love for me. Last year, I entered Fukui Medical School, and started to live alone. My despising of my father had not changed at all, so I was very happy to live alone, because I didn't have to meet him except during my vacation! Of course, I seldom went home though it is possible to go there in only one hour by car. But since I have lived by myself, my impression of my father has gradually changed. My mother often said my father wanted to meet me and he talked about me very often.