Design Of The Rear Spoiler For Road Vehicles Engineering Essay

Design Of The Rear Spoiler For Road Vehicles Engineering Essay ABSTRACT When objects move through air, forces are generated by the relative motion between the air and surfaces of the object. Aerodynamics is the study of these forces, generated by the motion of air, usually aerodynamics are categorized according to the type of flow as subsonic, hypersonic, supersonic The spoiler is also a part of the aerodynamics. The function of the spoiler is to spoil the unfavourable flow of air flowing through the car and generate a proportional downforce. This work describes the design and the performance of the rear spoiler. Content 1. Introduction6 2. Literature Review7 2.1 Principle7 2.2 Working of Rear wing8 2.3Criteria for efficiency of the spoiler..9 3. Material..12 3.1 Material Types12 3.2 ABS Material12 4. Design calculation..13 5. Applications15 6. Conclusion..16 Figures Fig. 2.1.8 Fig. 2.2.9 Fig. 2.3..10 Tables Table 1..13 Table 1..14 Chapter 1 Introduction A spoiler is an aerodynamic device which is used to spoil the unfavourable air (unwanted movement of air like turbulence) of a car which is in motion. Basically this device fitted to the front and rear of the vehicle. The front spoiler also called as front wing or air dam, and the rear spoiler is also called as rear wing. From historical point of view, post-world-war 11 automobile racing was initially dominated by developments related to engine technology, and later to tire advancements. During the 1960s, race car aerodynamics evolved as an important and relatively inexpensive technology that could place less well-funded teams. Over time, the cars aerodynamics on vehicles has become more refined as cars are now tested in expensive wind tunnels as part of continued development process. The biggest jump in speed occurred in the 1972 with the first efficient use of front and rear wings. It has even nearly become one of the only aspects of performance gain due to the very marginal gains that can currently be made by engine changes or other mechanic component development. Chapter 2 Literature review 2.1 Principle: The main principle of the spoiler is to reduce the rear end lift that means to increase the downforce and to spoil unfavourable air movement across a body. Lift is one of the main aerodynamic forces imposed on a vehicle, but unlike drag, lift can be manipulated to enhance the performance of a car. Lift is the force that acts on a vehicle normal to the road surface that the vehicle rides on. Lift usually has the effect of pulling or lifting the vehicle away from the surface it drives on. However, by manipulating the car geometry it is possible to create negative lift, or down-force. Down-force enhances vehicle performance by increasing the normal load on the tires. This increases the potential cornering force which results in the ability of the vehicle to corner faster. This down force can be compared to a virtual increase in weight, there by pressing the car down onto the road and increasing the available frictional force between the car tyres and the road, which in effect enables higher cornering speeds. Drag is the aerodynamics force that resists the vehicles motion through a fluid and points backwards. Drag is detrimental to vehicle performance as it can limit the top speed of a vehicle and increase the fuel consumption, both of which are negative consequences for vehicles. Its size is proportional to the speed differential between the air and the solid object. What this wings or spoilers does is it prevents the separation of flow and thereby preventing the formation of vortices or helps to fill the vacuum in the rear end more effectively thus reducing drag. So what actually this wings does is that, The wing works by differentiating pressure on the top and bottom surface of the wing. As mentioned previously, the higher the speed of a given volume of air, the lower the pressure of that air, and vice-versa. What a wing does is make the air passing under it travel a larger distance than the air passing over it (in race car applications). Because air molecules approaching the leading edge of the wing are forced to separate, some going over the top of the wing, and some going under the bottom, they are forced to travel differing distances in order to Meet up again at the trailing edge of the wing. This is part of Bernoullis theory. What happens is that the lower pressure area under the wing allows the higher pressure area above the wing to push down on the wing, and hence the car its mounted to. The way a real, shaped wing works is essentially the same as an airplane wing, but its inverted. An airplane wing produces lift, a car wing produces negative lift or in other words what we call us, downforce. That lift is generated by a difference in pressure on both sides of the wing.    Well, if you look closely at the drawings, youll see that the upper side of the wing is relatively straight, but the bottom side is curved. This means that the air that goes above the wing travels a relatively straight path, which is short. The air under the wing has to follow the curve, and hence travel a greater distance. Now theres Bernoullis law, which basically states that the total amount of energy in a volume of fluid has to remain constant. (Unless you heat it or expose an enclosed volume of it to some form of mechanical work) If you assume the air doesnt move up and down too much, it boils down to this: if air (or any fluid, for that matter) speeds up, its pressure drops. From an energetic point of view, this makes sense: if more energy is needed to maintain the speed of the particles, theres less energy left do do work by applying pressure to the surfaces. In short: on the underside, air has to travel further in the same amount of time, which means it has to speed up, which means its pressure drops. More pressure on top of the wing and less on the underside results in a net downward force called downforce. 2.2 How the rear wing works: The rear wing assists the front wing and rear diffuser in the overall downforce setup of the car. The angle of the wing is adjusted according to each specific Grand Prix circuit, depending on the amount of downforce required, the weather and the amount of mechanical grip available. The end plates located at the sides of the wing are designed to smooth the meeting of two different airflows the high pressure air above the car tries to switch places with the low pressure air below the car and it is this that causes the spinning flow of air behind the car. When these two forces meet they form a vortex, a spinning flow of air which is very turbulent. 2.3 The efficiency of the wings is based on following criteria: Aspect Ratio The amount of downforce produced by a wing is determined by its size. The length to width ratio is called the aspect ratio; the larger the wing the greater the downforce. As the higher the Aspect ratio more efficient the wing will be. The higher the aspect ratio, the less air resistance created by the vortex at the wing tips. The aspect ratio is the span of the air foil (the long dimension perpendicular to the air flow) divided by its dimension parallel to the airflow. The angle of attack Fig 2.1 The efficiency of the wing is the downforce to drag ratio. The amount of downforce generated depends upon the angle or tilt of the wing. The greater the angle of attack the more the downforce will be created. While increasing downforce a wing also increases unwanted drag. Drag increases with the angle of attack as already stated. The downforce generated by the wing acts in vertical downward direction, while drag acts in the opposite direction to the air flow. Fig 2.2 From the above two graphs of coefficient of drag VS angle of attack the coefficient of drag can be assumed, if the angle of attack is 80 then the coefficient of drag will be 0.07. The height of the wing: The third thing is the height of the spoiler. The height also affects the performance of the spoiler. The gap between the trunk lid and the wing can make air to pass easily. The fig shows the effect of the height of the wing on the car. So the height is taken as 130 mm. Fig 2.3 Chapter 3 Material 3.1 Material types Spoilers are usually made of: ABS plastic Most original equipment manufacturers create spoilers produced by casting ABS plastic with various admixtures, which bring in plasticity to this inexpensive but fragile material. Frailness is a main disadvantage of plastic, which increases with product age and is caused by the evaporation of volatile phenols. Fibreglass Used in car parts production due to the low cost of the manufacturing process. Fibreglass spoilers consist of fibreglass filler fastened with synthetic tar. Fibreglass is sufficiently durable and workable, but has become unprofitable for large scale production. Silicon more recently, many auto accessory manufacturers are using silicon-organic polymers. The main benefit of this material is its phenomenal plasticity. Silicon possesses extra high thermal characteristics and provides a longer product lifetime. Carbon fibreglass based on carbon fibre is the youngest material on the automotive aftermarket. Carbon is light weight, durable, but also a very expensive material. Unlike ordinary fibreglass, solidification of the connecting tar takes place in a pressure chamber using high temperatures. Due to the very large amount of waste during the manufacturing process, large scale producers cannot widely use carbon fiber in automobile parts production currently. 3.2 ABS Material ABS  Resistance: Excellent resistance (no attack) to Glycerine, Inorganic Salts, Alkalis, Many Acids, Most Alcohols and Hydrocarbons Limited resistance (moderate attack and suitable for short term use only) to Weak Acids Poor resistance (not recommended for use with) Strong Acids and Solvents, Ketones, Aldehydes, Esters, and some Chlorinated Hydrocarbons ABS  Quick Facts: Maximum Temperature: 80 °C Minimum Temperature: -40 °C Autoclavable:  No Melting Point: 221 °F 105 °C Tensile Strength: 4,300 psi Hardness: R110 UV Resistance:  Poor Translucent Rigid Specific Gravity: 1.04 ABS Fabrication: It can be thermo-formed, pressure formed, blow moulded, sheared, sawed, drilled, or even cold stamped Joints can be ultrasonic welded, thermo-welded, and chemically bonded Impact resistant Commonly used for telephone bodies, safety helmets, piping, furniture, car components, TV casings, radios, control panels, and similar Chapter 4 Design Calculations The design of the rear wing or spoiler of the car is totally dependent on the coefficient of the drag. Higher the coefficient of drag, greater the performance of that spoiler. The coefficient of drag is directly proportional to the angle of the spoiler where the air attacks. As the angle increases the drag coefficient increases. To design the spoiler the width of the car should be necessary to consider the wing span that means the total length of the spoiler. The following table shows the most common width of the cars: Table 1 Honda City Toyota Corolla Kia Forte Mitsubishi Lancer Width 1715 1710 1775 1770 By considering the common width in the range of 1700 1780 mm, the length of the spoiler 1700mm can be acceptable to create the max drag force. The formula for downforce of a wing is given by: Where: D  is downforce in  Newton WS  is  wingspan  in metres H  is height in metres AoA  is  angle of attack F  is drag coefficient à Ã‚ Ã‚  is  air density  in kg/m ³ V  is  velocity  in m/s The data for the calculation of the spoiler is as follows: Table 2 WS/ Length 1700mm 1.7 m Height 100mm 0.1 m Angle of attack 150 (15 x à Ã¢â€š ¬/180) 0.26 radians Coefficient of drag (according to AOA) 0.015 0.015 Density of air (à °Ã‚ Ã‚ Ã¢â‚¬ ) 1.2 1.2 Max. Velocity (V) 200 km/hr (200/3.6) 55.55 m/s The angle of attack is taken as 150, because the car should have some downforce but in some limit. So if the angle of attack increased the drag will increase which can affect the performance of the vehicle like less fuel economy. Therefore the angle 150 is the perfect angle for the road vehicle spoiler. Also to design spoiler the second thing is the speed of the vehicle. To achieve the best performance max speed required that is 200km/hr for a normal road vehicle. The third thing is the height of the spoiler. The height also affects the performance of the spoiler. The gap between the trunk lid and the wing can make air to pass easily. So the height is taken as 100 mm. Therefore by substituting the above values in the formula, D = x (1.7 x 0.13 x 0.26) x 0.015 x 1.2 x (55.55)2 D = 1.595 N Therefore the downforce created by the spoiler is 1.2275 N. This could be acceptable for a normal road vehicle. Chapter 5 Applications Cars have spoilers to increase their grip on the road. Normally the weight of a car is the only thing that forces the tires down onto the pavement. Without spoilers, the only way to increase the grip would be to increase the weight, or to change the compound the tire was made out of. The only problem with increasing the weight is that it doesnt help in turns, where you really want to grip. All that extra weight has inertia, which you have to overcome to turn, so increasing the weight doesnt help at all. The way the spoiler works is like an airplane wing, but upside down. The spoiler actually generates whats called down force on the body of the car.   Chapter 6 Conclusion The design of spoiler described in this project can be used for any road vehicle having width at least 1700mm. The main aim to design this type of spoiler is to improve the overall performance of the car with respect to dragforce. The designed spoiler could be give the best result if it will be in use.

Explain the Importance of Resilience in Children and Young People Essay

Resilience is a mixture of nature and nurture. Attributes that some children are born with, such as good intellectual ability and a placid, cheerful temperament, are associated with resilience. Children who are born prematurely and/or with disabilities, who cry and cannot be comforted, who cannot sleep or who will not accept being held are more vulnerable to adversity and may be less likely to be resilient. There are, however, many other qualities associated with resilience which develop through children’s life experiences — the main ones can be summarised as follows: Good self esteem derives from being accepted by people whose relationship one values and from accomplishment in tasks one values. Praise, on its own, will not improve self-esteem; the child him or herself has also to ascribe value to the achievement. A belief in one’s own self-efficacy means having the qualities of optimism; ‘stickability’ and believing that one’s own efforts can make a difference. For children and young people who have had very damaging childhoods the creation of ‘survivor’s pride’, i. e. the ability to value how far they have overcome huge adversity in their lives, is helpful. Young people’s sense of self-efficacy is enhanced by taking responsibility and making decisions. Initiative is the ability and willingness to take action, including action to stop abuse occurring. Children and young people facing adversity are in a stronger position to deal with it if they are able to take the initiative in finding ‘creative’ responses. This sometimes combines with a strong sense of responsibility towards others such as siblings. Faith and morality can be described as ‘a belief in a broader value system which can help the child to persist in problem solving or in surviving a set of challenging life circumstances. A sense of coherence in their experiences gives the child a feeling of rootedness; the conviction that life has meaning and an optimistic focus’ (Daniel, Wassell and Gilligan 1999. Trust is believing in or relying on another person or thing. In order to trust others, you do not need to love them but you do need to experience them as reliable, feel respect for them, value them and not expect them to betray your confidences. Attachment is ‘an affectionate bond between two individuals that endures through space and time and serves to join them emotionally’ (Klaus & Kennell 1976, quoted in Fahlberg 1994). A secure attachment relationship creates a secure base from which a child feels safe to explore the world. Many looked fter children whose primary attachment figures have been unsupportive or unpredictable are able, fortunately, to find other attachment figures. In fact, one sign of resilience in children is the ability to ‘recruit’ caring adults who take a particular interest in them. This could be a neighbour, friend’s parent(s), teacher, child minder, relative, mentor or befriender, foster carer or, of course, residential worker. The concept of a secure base originally related to the security provided by a dependable attachment relationship. However, in the context of looked after children it has developed a wider meaning i. . the provision of a consistent and stable place to live and continuity of wider relationships which then allow the maintenance or development of attachment relationships. Where placement moves are absolutely unavoidable, strenuous efforts should be made to maintain continuity in other aspects of children’s lives. Meaningful roles: Such roles include proficiency at academic and non-academic activities at school, sporting prowess, part time work, volunteering, caring for siblings, and domestic responsibilities, provided they are not excessive. Such roles are likely to have a positive effect in several ways — they can be beneficial in providing a sense of positive identity and a source of self-esteem, they may act as a source of pleasure and hope or distract young people from the adversity they are experiencing in other areas of their lives. Autonomy means the ability to make decisions. Young people who are autonomous know that it is OK to make mistakes and that you can learn from mistakes. They take reasonably well calculated risks. Autonomous children and young people are good at self-regulation — they gain increasing control over their own emotions and behaviour. Identity: Young people in care have a deep need to know and understand who they are, where they belong and to whom they are important. They may need help to find these answers. Children and young people’s ethnicity, religion, culture and language form part of their identity. Preservation of their background and culture helps to create continuity and a secure base; it is also a legal right. Young people, who have good insight into their own difficulties, including a realistic assessment of their own contribution and the contribution of others to those difficulties, are more likely to be resilient. Young people who are able to recognise benefits, as well as negative effects, from severe adversity are likely to be resilient. Insight helps people to take appropriate actions and make appropriate choices. It is therefore linked to self-efficacy and to initiative. Humour is the final building block of resilience. It can help young people to distance themselves from, and therefore reduce, emotional pain and it can also help them make and sustain relationships — humorous people are usually popular people.

Bureaucracy

One of the characteristics off eructation school/organization is specialization. Specialization is concentrating on a specific task for example; bursar as one of the school officers regulates finances of the school. According to Weber as cited in Ho and Missile (1 991 ) â€Å"division of labor and specialization means that the regular activities required for the purposes of the bureaucratically governed structure are distributed in a fixed way as official duties† (p: 104). This is to say, work in schools is divided into different task hence everyone have his/her specific task.Teachers are specializing by teaching a specific subject for example, Mathematics. Mathematics teacher specialize by teaching only Mathematics to all the grades in the school that is, form one, two and three. This is advantageous due to the fact that it makes one's job easier and to be of high quality since he/she deals with a specific subject. Furthermore, specialization goes hand in hand with what is ca lled division of labor. Light, Keller and Calhoun (1989) state â€Å"in bureaucracies the work to be accomplished is broken down into clear-cut division of labor and people are trained to specialize in performing each task† (p: 219).This is division of labor which refers to dividing work into small and manageable tasks. Therefore since tasks in schools are too complex to be performed by a single individual, division of labor is crucial. Everyone in a school has a position for example; there is a head teacher who is responsible for the running affairs of the school and teachers who are responsible for imparting knowledge to students or simply instruction delivery. Division of labor among positions improves efficiency. Ho and Missile (1991) postulate that division of labor produces specialization hence efficiency increases.And this is because specialization helps employees to be knowledgeable and expert at performing their prescribed duties. So the authors suggest â€Å"such d ivision enables the organization to employ personnel on the basis of technical qualifications. Hence, division of labor and specialization produce more expertise in school personnel† (p: 105). This is to say that workers are employed for the type of work they have skills on. Another characteristic of bureaucratic school/organization is a hierarchy of offices.According to Ho and Missile (1991) offices are arranged hierarchically; ACH lower office is under the control and supervision of a higher one. In agreement YMMV. Clientà ¨les. Com suggests that the structure of a bureaucracy is called a hierarchy because it includes a series of levels from the most menial worker in the organization to the highest executive. Each level has clearly defined authority and responsibilities. Therefore, this makes work to be easier and more manageable since everyone knows his/her responsibility in the school/organization. Light, et al. (1989) state that when an organization's operation is divide d into smaller, more manageable tasks; the arioso activities must be put together. Thus, the solution is to organize workers into a hierarchy with each person being responsible to the person directly above in the chain of command. This means that everyone will have a supervisor. For example, senior teachers can supervisor teachers to assess the efficiency of their work in the classroom. Moreover, a hierarchy of offices helps in keeping order within the organization since everyone understands his place very well and what is expected of him/her.According to Stark (1989) â€Å"all employees in the organization must know who their boss is and each errors should always respect their chain of command† (p: 594). To support this, employees should respect those in authority or their supervisors by doing what they expect them to do. They should also follow a channel of communication within the organization. The author also postulates â€Å"in this way the people at the top can be sure that directives arrive where they are meant to go and know where responsibility lie† (p: 594).Therefore, a hierarchy of offices is very important characteristic of a bureaucratic school/ organization as it allows workers to focus on their responsibilities since it Leary define them. It also encourages carefulness among workers as it is easier to trace who is not doing his/her work properly. Www. Baccalaureate's. Com/excerpts suggests that a formal hierarchy is the basis of central planning and centralized decision making of a bureaucratic school/organization.This is due to the fact that these offices are for the people who are responsible for the operation of the school/ organization hence; they plan and make decisions together on how best to do that. Stark (1989) postulates ‘to ensure order in decision making, business is inducted primarily through written rules, records and communication† (p: 593). This is to say, planning and decision making is central to a hie rarchy of offices within the school/organization due to the fact that it is where written rules, records and communication are found.Rules and regulations are one of the characteristics of bureaucratic school/organization. In any organization rules and regulations are very vital because they ensure that there is order. Weber as cited in Stark (1989) â€Å"stressed that rational bureaucracies must be managed in accordance with careful developed rules and principles that can e learned and applied†¦ † (P: 595). To support this, a bureaucratic school should have rules that guide employees' behavior since they are applied equally to everyone of them. They cannot be broken due to the fact that by doing so punishment will follow.Therefore, rules and regulations are important in a bureaucratic school since they promote self-discipline and self- control among workers. This will help the organization to run smoothly and efficiently since workers need not to be followed to do their work as they are guided by the rules and regulations. Rules and regulations maintain control thin the organization as according to Ho and Missile (1991) â€Å"†¦ By taking advantage of the screening functions of bureaucratic rules, administrators can gain and maintain some control over organizational activities.They anticipate that general and impersonal rules will be good because they provide direction without creating status distinctions. Control is the us maintained by using bureaucratic rules†¦ † (P: 109-110). Moreover, to ensure that rules and regulations are the characteristics of bureaucratic school/ organization; Bernard, Burgess and Kirby (2004) suggest that a bureaucratic school/organization should have a body of rules that governs it. For example, employees usually have a code of conduct. According to Fragrant (1980) a code of conduct is a set of rules for professional conduct since teachers are professionals.These rules are divided into two; a commitmen t to the students and to the profession. A commitment to the students are rules which outline what the teacher should do and not to do to students for example, the teacher disclosing information about students without their permission. And a commitment to the profession are rules which outline hat they society expects from the teacher for example, the teacher should not dress in an unprofessional manner. Ho and Missile (1991 ) state that rules and regulations provide continuity of operation and help to coordinate activities.This is because employees are guided by rules on what they should do and not to therefore, rules and regulations in a bureaucratic school promote cooperation within the organization since employees work well with each other. Lastly, one of the characteristics of bureaucratic school/ organization includes rewards based on merit. According to Light, et al. (1989) â€Å"positions in a bureaucracy are awarded on the basis Of technical qualifications (as measured by tests, educational degrees and diplomas and other standardized yardsticks) not on the basis of who one knows† (p: 220).This is to say that jobs and promotion in a bureaucratically school/ organization are obtained through qualifications. For example in Botswana, for one to be a secondary school teacher should have at least a certificate of Diploma in Secondary Education not just passed form five and then be employed as teacher. Employees should be employed for the job they qualify or so that work cannot be difficult for them since they will be doing what they are trained for. This will in turn, helps the school/organization to be effective and efficient.Furthermore, rewards based on merit will allow us providers to give promotions to the ones who are qualifying for those positions. This is to say they will not give promotion on the basis of favoritism like to their relatives and friends. Stark (1989) states â€Å"to ensure expert management, appointment and promotion are base d on merit rather than favoritism and those appointed treat their positions as full-time, primary arrears† (p: 593). To support this, people are rewarded because of the efforts they put in their work.So that's why in schools teachers can be promoted and given positions such as, from being a subject teacher to a subject coordinator. Nevertheless, giving jobs and promotions to people because one knows them, will make the school/organization to suffer since they do not qualify for those works. Ho and Missile (1991) suggest â€Å"promotion is dependent on the judgment of superiors† (p: 105). This is to say that promotion is made by supervisors but even though, it is upon them they should do it fairly.

Opportunity For Young Illegal Immigrants - 950 Words

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