Publication detail
Vehicle ride height change due to radial expansion of tires
ČAVOJ, O. BLAŤÁK, O. HEJTMÁNEK, P. VANČURA, J.
English title
Vehicle ride height change due to radial expansion of tires
Type
journal article - other
Language
en
Original abstract
In most cases, tire deformations caused by wheel rotation are not being considered in the development of vehicle aerodynamics. On the road, the tires radially expand with increasing speed, thus affecting the realistic ride height of a vehicle. This in turn often increases the real world aerodynamic drag compared to values obtained using CFD or a wind tunnel as the mass flow through relatively rough underbody increases with ground clearance. In this study, the on-road ride height increments were measured while running a vehicle in a straight line with fixed velocity and the aerodynamic lift of a vehicle was determined in a wind tunnel. Subsequently, the dependencies of ride heights on axle loads were obtained by loading the vehicle in standstill with ballast. By comparing the ride heights in high and very low velocities with expected vertical displacement caused purely by aerodynamic lift force as computed according to the ride height – axle load equations, the amount of ride height change due to tire radial expansion was determined.
English abstract
In most cases, tire deformations caused by wheel rotation are not being considered in the development of vehicle aerodynamics. On the road, the tires radially expand with increasing speed, thus affecting the realistic ride height of a vehicle. This in turn often increases the real world aerodynamic drag compared to values obtained using CFD or a wind tunnel as the mass flow through relatively rough underbody increases with ground clearance. In this study, the on-road ride height increments were measured while running a vehicle in a straight line with fixed velocity and the aerodynamic lift of a vehicle was determined in a wind tunnel. Subsequently, the dependencies of ride heights on axle loads were obtained by loading the vehicle in standstill with ballast. By comparing the ride heights in high and very low velocities with expected vertical displacement caused purely by aerodynamic lift force as computed according to the ride height – axle load equations, the amount of ride height change due to tire radial expansion was determined.
Keywords in English
vehicle aerodynamics, tire deformation, on-road measurements, laser displacement transducer
RIV year
2015
Released
05.12.2015
Publisher
ČVUT v Praze MECCA
Location
Praha
ISSN
1214-0821
Volume
13
Number
2
Pages from–to
22–27
Pages count
6
BIBTEX
@article{BUT127769,
author="Ondřej {Čavoj} and Ondřej {Blaťák} and Petr {Hejtmánek} and Jan {Vančura},
title="Vehicle ride height change due to radial expansion of tires",
year="2015",
volume="13",
number="2",
month="December",
pages="22--27",
publisher="ČVUT v Praze MECCA",
address="Praha",
issn="1214-0821"
}