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The Basic Nature of Vehicle Understeer-Oversteer
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1965 by SAE International in United States
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This paper gives a comprehensive analysis of vehicle understeer-oversteer, utilizing theoretical and experimental approaches. It departs from the conventional by defining understeer-oversteer in the transient as well as in the steady-state condition under various types of inputs. The relationship between understeer-oversteer and directional and oscillatory stability is stated within this concept. The paper introduces new definitions, based on transient condition analysis, for direct and indirect understeer, directional and oscillatory stability, side-slip velocity, and others. It employs a computer program evolved from the equations of motion, shown in the comprehensive Appendix, to analyze the basic nature of understeer-oversteer. New procedures are outlined for quantitative determination of vehicle understeer and stability. The paper discusses the relationships between understeer, oscillatory stability, and the subjective “feel” of passenger automobiles. Understeer rate and yaw damping are stated to be the major factors controlling vehicle handling characteristics under transient conditions. The paper discusses, in detail, the direct and indirect understeering-oversteering effects produced by individual vehicle design factors.
CitationBergman, W., "The Basic Nature of Vehicle Understeer-Oversteer," SAE Technical Paper 650085, 1965, https://doi.org/10.4271/650085.
Data Sets - Support Documents
|Unnamed Dataset 1|
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- Ellis J. R. “Understeer and Oversteer,” “Automobile Engineer,” May 1963 178
- Ellis J. R. “Tyre Mechanics and Vehicle Handling,” “Automotive Design Engineering,” September 1963 61
- Bundorf R. T. Nordeen D. L. “Terminology For Vehicle Directional Control and Tire Characteristics” proposed in the article “Vehicle Directional Control Behavior Described in More Precise Terms,” SAE Journal February 1964 26
- Bundorf R. T. Pollock D. E. Hardin M. C. “Vehicle Handling Response To Aerodynamic Inputs,” Paper presented at SAE Summer Meeting, Montreal, Canada June 10–14 1963
- Bergman W. “Theoretical Prediction of the Effect of Traction On Cornering Force,” SAE Transactions 69 1961 614
- Bergman W. Fox E. Saibel E. “Dynamics of an Automobile In a Cornering Maneuver On and Off the Highway.” Paper presented to first International Conference on the Mechanics of Soil-Vehicle Systems June 1961
- Walker Lind “The Automobile Engineer,” 40 530 533 1950
- Walker Lind “The Automobile Engineer,” 40 1950 282 283