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The Relationship Between the Complexity of Linear Models and the Utility of the Computer Results
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English
Abstract
Linear analysis and corresponding vehicle tests have been used since the late 1950's to help understand the directional response of automobiles and commercial vehicles. This work is now well accepted, and linear terms such as understeer gradient and response time are descriptors routinely used to characterize vehicle performance in the linear range.
This paper assesses the use of various levels of complexity in linear models. It verifies that, for steady state measures such as understeer gradient, all important effects can be handled quasistatically and a two degree of freedom model is adequate. The paper then illustrates situations in which the roll degree of freedom can be important for transient calculations, and assesses the changes in calculated transient results deriving from the addition to the model of time lags in lateral tire force buildup.
Citation
Lund, Y. and Bernard, J., "The Relationship Between the Complexity of Linear Models and the Utility of the Computer Results," SAE Technical Paper 920052, 1992, https://doi.org/10.4271/920052.Also In
References
- Segel, L. “Theoretical Prediction and Experimental Substantiation of the Response of the Automobile to Steering Control,” Proceedings of the Institution of Mechanical Engineers Automobile Division 310 330 1956-57
- Bergman, W. “The Basic Nature of Vehicle Understeer-Oversteer,” International Automotive Engineering Congress January 1965
- Bundorf, R. T. “The Influence of Vehicle Design Parameters on Characteristic Speed and Understeer,” Paper 670078 SAE Transactions 76 1967
- Fancher, P. S. Bernard, J. E. Emery, L. H. “The Effects of Tire-in-Use Factors on Passenger Car Performance,” SAE Paper 741107 International Automobile Tire Conference October 1974
- Bundorf, R. T. Leffert R. L. “The Cornering Compliance Concept for Description of Vehicle Directional Control [Handling] Properties,” General Motors Proving Ground Engineering Publication 2771 1971
- Winsor, F. J. “Cornering Compliance Applied to Dynamics of Rolling Vehicles,” SAE Paper 760711 Automobile Engineering Meeting October 1976
- Weir, D. H. DiMarco, R. J. “Correlation and Evaluation of Driver/Vehicle Directional Handling Data” Paper 780010 SAE Congress and Exposition 1978
- Pacejka, H. B. “Analysis of the Dynamic Response of a Rolling String-Type Tire Model to Lateral Wheel Plane Vibrations” Vehicle System Dynamics I 1972
- Owen, R. H. Bernard, J.E. “Directional Dynamics of a Tractor-Loader-Backhoe,” Vehicle System Dynamics 11 251 265 1982
- Heydinger, G. J. Garrott, W. R. Chrstos, J. P. “The Importance of Tire Lag on Simulated Transient Vehicle Response,” SAE Paper 910235 International Congress and Exposition 1991
- Bernard, J. E. Vanderploeg, M. J. Shannan, J. “Linear Analysis of a Vehicle with Four-Wheel Steering,” SAE Paper 880643 International Congress and Exposition 1988
- Bernard, J. E. Shannan, J. Vanderploeg, M. J. “Vehicle Rollover on Smooth Surfaces,” SAE Paper 891991 Passenger Car Meeting and Exposition September 1989
- Heydinger, G. J. “Improved Simulation and Validation of Road Vehicle Handling Dynamics,” The Ohio Slate University 1990