Title: Symbolic multi-objective optimisation of the dynamic behaviour of actively suspended road vehicles

Authors: Massimiliano Gobbi, Giampiero Mastinu

Addresses: Department of Mechanical Engineering, Politecnico di Milano (Technical University), Piazza Leonardo da Vinci, 32, I-20133 Milan, Italy. Department of Mechanical Engineering, Politecnico di Milano (Technical University), Piazza Leonardo da Vinci, 32, I-20133 Milan, Italy

Abstract: The dynamic behaviour of actively suspended rod vehicles is studied symbolically by means of two different simple linear system models (one and two degrees of freedom). In the order to describe the response of such systems to stochastic excitation, analytical formulae are derived estimation important vehicle performance indices such as ride comfort, working space (i.e. relative displacement between wheel and vehicle body), and road holding. Two different power spectral densities describing road roughness have been used. By applying Multi-objective Programming, analytical formulae have been derived for defining in a theoretically rigorous way the best compromise among ride comfort, working space and road holding. Fundamental but still un-referenced issues on sky-hook control strategy of active suspensions are presented and discussed.

Keywords: active suspension; multi-objctive optimisation; road vehicle; symbolic calculus.

DOI: 10.1504/IJVD.2002.001986

International Journal of Vehicle Design, 2002 Vol.28 No.1/2/3, pp.189-213

Published online: 15 Aug 2003 *

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