TAILIEUCHUNG - An overview on motor vehicle aerodynamics

The forces and moments the vehicle receives from the surrounding air depend more on the shape of the body than on the characteristics of the chassis. A detailed study of motor vehicle aerodynamics is thus beyond the scope of a book dealing with the automotive chassis. However, aerodynamic forces and moments have a large influence on the longitudinal performance of the vehicle, its handling and even its comfort, so it is not possible to neglect them altogether. Even if the goal of motor vehicle aerodynamics is often considered to be essentially the reduction of aerodynamic drag, the scope and the. | 21 AN OVERVIEW ON MOTOR VEHICLE AERODYNAMICS The forces and moments the vehicle receives from the surrounding air depend more on the shape of the body than on the characteristics of the chassis. A detailed study of motor vehicle aerodynamics is thus beyond the scope of a book dealing with the automotive chassis. However aerodynamic forces and moments have a large influence on the longitudinal performance of the vehicle its handling and even its comfort so it is not possible to neglect them altogether. Even if the goal of motor vehicle aerodynamics is often considered to be essentially the reduction of aerodynamic drag the scope and the applications of aerodynamics in motor vehicle technology are much wider. The following aspects are worth mentioning reduction of aerodynamic drag reduction of the side force and the yaw moment which have an important influence on stability and handling reduction of aerodynamic noise an important issue for acoustic comfort and reduction of dirt deposited on the vehicle and above all on the windows and lights when driving on wet road and in particular in mud or snow conditions. This aspect important for safety can be extended to the creation of spray wakes that can reduce visibility for other vehicles following or passing the vehicle under study. G. Genta L. Morello The Automotive Chassis Volume 2 System Design 115 Mechanical Engineering Series Springer Science Business Media . 2009 116 21. AN OVERVIEW ON MOTOR VEHICLE AERODYNAMICS The provisions taken to obtain these goals are often different and sometimes contradictory. A typical example is the trend toward more streamlined shapes that allow us to reduce aerodynamic drag but at the same time have a negative effect on stability. Another example is the mistaken assumption that a shape that reduces aerodynamic drag also has the effect of reducing aerodynamic noise. The former is mainly influenced by the shape of the rear part of the vehicle while the latter is much influenced by the

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