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A Brush-Model Based Semi-Empirical Tire-Model for Combined Slips
Technical Paper
2004-01-1064
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper presents a new method to derive the tire forces for simultaneous braking and cornering, by combining empirical models for pure braking and cornering using brush-model tire mechanics. The method is aimed at simulation of vehicle handling, and is of intermediate complexity such that it may be implemented and calibrated by the end user. The brush model states that the contact patch between the tire and the road is divided into an adhesion region where the rubber is gripping the road and a sliding region where the rubber slides on the road surface. The total force generated by the tire is then composed of components from these two regions. In the proposed method the adhesion and the sliding forces are extracted from an empirical pure-slip tire model and then scaled to account for the combined-slip condition. The combined-slip self-aligning torque is described likewise. The separation of the adhesive and sliding forces makes it possible to let the sliding force depend on the relative velocity between the tire and the road. This introduces a velocity dependence in the model, even though this is not explicitly present in the pure-slip model. The approach is quite different from most previous combined-slip models, in that it is based on a rather detailed mechanical model in combination with empirical pure-slip models. The model is computationally sound and efficient and does not rely on any additional parameters that depend on combined-slip data for calibration. It can be used in combination with virtually any empirical pure-slip model and in this work the Magic Formula is used in examples. Results show good correspondence with experimental data.
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Citation
Svendenius, J. and Gäfvert, M., "A Brush-Model Based Semi-Empirical Tire-Model for Combined Slips," SAE Technical Paper 2004-01-1064, 2004, https://doi.org/10.4271/2004-01-1064.Also In
Vehicle Dynamics and Simulation, Steering and Suspensions on CD-ROM from the SAE 2004 World Congress
Number: SP-1881CD; Published: 2004-03-08
Number: SP-1881CD; Published: 2004-03-08
References
- Bakker E. Nyborg L. Pacejka H. B. Tyre modelling for use in vehicle dynamics studies SAE Technical Paper 870421 1987
- Bakker E. Pacejka H. B. Lidner L. A new tire model with an application in vehicle dynamics studies SAE Technical Paper 890087 1989
- Edlund S. Tyre models: Subreport -91 Volvo Truck Corporation 1991
- Gäfvert M. Svendenius J. Construction of semi-empirical tire models for combined slip Department of Automatic Control, Lund Institute of Technology Sweden April 2003
- Gäfvert Magnus Topics in Modeling, Control, and Implementations in Automotive Systems Lund Institute of Technology Sweden 2002
- Gim G. Nikravesh P. E. An analytical model of pneumatic tyres for vehicle dynamics simulations. Part 2: Comprehensive slips International Journal of Vehicle Design 12 1 19 39 1991
- Nordström O. The VTI flat bed tire test facility - a new tool for testing commercial tire characteristics SAE Technical Paper 933006 1993
- Pacejka H. B. Modelling of the pneumatic tyre and its impact on vehicle dynamic behavior Technische Universiteit Delft 1988
- Pacejka H. B. Tyre and Vehicle Dynamics Butterworth-Heinemann 2002
- Schuring D. J. Pelz W. Pottinger M. G. A model for combined tire cornering and braking forces SAE Technical Paper 960180 1996
- Wong J. Y. Theory of Ground Vehicles John Wiley & Sons 3 2001