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Optimization of the Dynamic Behavior of Semi-Actively Suspended Road Vehicles

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Abstract

In this paper, two-degree-of-freedom linear model of quarter-car is used to derive a number of analytical formulae describing the dynamic behavior of semi-actively suspended vehicles running on randomly profiled roads. Two power spectral densities are considered for modeling the road irregularities. The proposed semi-active control law consists of two tunable parameters that are given as a function of the running conditions of the vehicle. An optimization method is applied to obtain the best compromise among conflicting performance indices pertaining to the vehicle suspension system. Two objective functions are minimized subjects to three constraints. The proposed optimization method is developed based on the frequency regions. Passive, semi-active suspension systems with and without frequency regions subject to the two road profiles are compared in frequency domain analyses. The obtained result indicates that a semi-active suspension system has a significant potential in improving the ride comfort and the road holding.

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