An Approach Toward the Optimal Semi-Active Suspension

[+] Author and Article Information
D. Hrovat

Scientific Research Laboratory, Ford Motor Company, Dearborn, Mich. 48121

D. L. Margolis, M. Hubbard

Department of Mechanical Engineering, University of California at Davis, Davis, Calif. 95616

J. Dyn. Sys., Meas., Control 110(3), 288-296 (Sep 01, 1988) (9 pages) doi:10.1115/1.3152684 History: Received October 01, 1987; Online July 21, 2009


In this paper, a two-degree-of-freedom model of a semi-actively suspended vehicle is used as a starting point in the design of an optimal suspension. The optimization is performed with respect to a quadratic performance index reflecting suspension design constraints and ride quality requirements. Two closely related mathematical descriptions of the model are given, one leading to a linear and the other to a bilinear system of differential equations, with an additional inequality constraint reflecting the passivity of the semi-active device. Since the resulting stochastic optimization problem does not allow for a closed-form analytical solution, a numerical method is proposed as an approximate solution. The justification for the method is based on a recent existence theorem from stochastic optimal control theory. Illustrative simulation results of the optimization are presented.

Copyright © 1988 by ASME
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