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Automotive aerodynamics
Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high speeds. Air is also considered a fluid in this case. For some classes of racing vehicles, it may also be important to produce downforce to improve traction and thus cornering abilities.
==History==
The frictional force of aerodynamic drag increases significantly with vehicle speed.〔() Tuncer Cebeci, Jian P. Shao, Fassi Kafyeke, Eric Laurendeau, ''Computational Fluid Dynamics for Engineers: From Panel to Navier-Stokes'', Springer, 2005, ISBN 3-540-24451-4〕 As early as the 1920s engineers began to consider automobile shape in reducing aerodynamic drag at higher speeds. By the 1950s German and British automotive engineers were systematically analyzing the effects of automotive drag for the higher performance vehicles.〔Proceedings: Institution of Mechanical Engineers (Great Britain). Automobile Division: Institution of Mechanical Engineers, Great Britain (1957)〕 By the late 1960s scientists also became aware of the significant increase in sound levels emitted by automobiles at high speed. These effects were understood to increase the intensity of sound levels for adjacent land uses at a non-linear rate.〔C. Michael Hogan & Gary L. Latshaw, (''The relationship between highway planning and urban noise'' ), Proceedings of the ASCE, Urban Transportation Division specialty conference, May 21/23, 1973, Chicago, Illinois.
by American Society of Civil Engineers. Urban Transportation Division〕 Soon highway engineers began to design roadways to consider the speed effects of aerodynamic drag produced sound levels, and automobile manufacturers considered the same factors in vehicle design.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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