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- W2061189355 abstract "An overview of existing and alternative forms of understeer/oversteer expressions is presented. New forms are derived consistent with conceptual extensions to the configurations of the vehicle's steering system, the driving mode - steady-state or transient, and the responses - path curvature or yaw velocity. Derivation of all expressions is presented with a consistent use of the reference case and the related Ackermann vehicle construct. The is otherwise represented in a traditional manner as a bicycle model operating in the linear range consistent with small angle approximations. The vehicle's steering system is assumed to be more generally configured with four-wheel steer and active or steer-by-wire actuation at both axles. The actuation is assumed to allow the introduction of significant speed sensitivity to the effective overall steering ratios. Discussion is devoted to the significance of this speed sensitivity on test results and the determination of the mean reference steer angles. Expressions for gradient associated with this generally configured are simplified for the more familiar case of a front-wheel steer with a passive steering system having a fixed overall steering ratio. The driving mode can be either steady-state, as is traditionally assumed, or transient. The transients are assumed to be the result of steering transients or speed changes. Understeer expressions are presented using traditional variables, included reference steer angle and included steer angle, and less frequently used variables, axle reference sideslip angles and cornering compliances. Context is given with a brief history of the development of concepts, both traditional steady-state and transient, and usage of the terms understeer and oversteer. Language: en" @default.
- W2061189355 created "2016-06-24" @default.
- W2061189355 creator A5026250198 @default.
- W2061189355 date "2012-04-16" @default.
- W2061189355 modified "2023-09-24" @default.
- W2061189355 title "Understeer Concepts with Extensions to Four-Wheel Steer, Active Steer, and Time Transients" @default.
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- W2061189355 doi "https://doi.org/10.4271/2012-01-0245" @default.
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