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On-Road Investigation of a Vehicle's Longitudinal Response to Wind Gusts
Technical Paper
2008-01-0472
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The objective of this work is an attempt to investigate the longitudinal aerodynamic response of a vehicle to ambient wind. The natural wind environment is usually unsteady and causes therefore slight oscillations of the vehicle's velocity around its cruising speed. The additional force superposed to the steady drag caused by the smooth oncoming air flow is generated by ambient turbulence. For the on-road investigation of the vehicle's longitudinal response to the ambient turbulent flow field both vehicle velocity and relative airspeed in driving direction are recorded by independent data acquisition systems during a set of coastdowns. The deceleration data and the vehicle's response to the airspeed fluctuations are derived by numerical filtering techniques and differentiation of the motorcar's velocity-time history. The study results in a frequency-dependent response function.
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Bischof, G., "On-Road Investigation of a Vehicle's Longitudinal Response to Wind Gusts," SAE Technical Paper 2008-01-0472, 2008, https://doi.org/10.4271/2008-01-0472.Also In
References
- Saunders J. Wordley S. A Review of Measurement of Ambient Turbulence with Respect to Ground Vehicles SAE technical paper 2006-01-1028 2006
- Cooper K. R. Watkins S. The Unsteady Wind Environment of Road Vehicles, Part One: A Review of the On-road Turbulent Wind Environment SAE technical paper 2007-01-1236 ( 2007
- Watkins S. Cooper K. R. The Unsteady Wind Environment of Road Vehicles, Part Two: Effects on Vehicle Development and Simulation of Turbulence SAE technical paper 2007-01-1237 2007
- Baker C. J. Ground vehicles in high cross winds -Parts I, II and III, J. Fluid Struct 5 1991
- Baker C. J. The behaviour of road vehicles in unsteady cross winds, J. Wind Eng. Ind. Aerodyn 49 1993
- Nguyen T. M. Saunders J. W. Watkins S. The Sideways Dynamic Force on Passenger Cars in Turbulent Winds SAE technical paper 970405 1997
- Bischof G. Bratschitsch E. Haas A. Kaltenhauser A. Ullrich F. Technical Note: On-road determination of aerodynamic drag improvements, Proc. Instn Mech. Engrs 218 Part D: J. Automobile Engineering 2004
- Bischof G. Bratschitsch E. Mandl M. On-Road Aerodynamic Drag Analysis by Simultaneous Linear Inversion of the Equation of Motion SAE technical paper 2005-01-1456 2005
- Hamming R. W. Digital Filters Dover Publications, Inc. Mineola, New York 1998
- Lanczos C. Applied Analysis Dover Publications, Inc. Mineola, New York 1988
- Press W. H. Teukolsky S. A. Vetterling W. T. Flannery B. P. Numerical Recipes in C - The Art of Scientific Computing Cambridge University Press 1988
- Buckley F. T. ABCD - An Improved Coast Down Test and Analysis Method SAE technical paper 950626 1995
- Passmore M. A. Le Good G.M. A Detailed Drag Study Using The Coastdown Method SAE technical paper 940420 1994
- Watkins S. Saunders J.W. Turbulence Experience by Road Vehicles under Normal Driving Conditions SAE technical paper 950997 1995
- Gillespie T. D. Fundamentals of Vehicle Dynamics Society of Automotive Engineers, Inc. Warrendale 1992
- Cooper R. K. Atmospheric turbulence with respect to moving ground vehicles J. Wind Eng. Ind. Aerodyn. 17, 2 1984
- Ride and Vibration Data Manual, SAEJ6a Society of Automotive Engineers, Inc. Warrendale 1965