Title: Integrated design of a quarter-car semi-active suspension system using a convex integrated design method

Authors: Ke Fu, James K. Mills

Addresses: Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON M5S 3G8, Canada. ' Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, ON M5S 3G8, Canada

Abstract: In this paper, a new integrated design method – the convex integrated design (CID) method – is introduced and applied to the design of a semi-active suspension system. The closed-loop system is required to simultaneously satisfy four closed-loop performance specifications: car body acceleration, suspension deflection, tyre dynamic load and control effort. With a simple two-stage algorithm, the mechanical structure design parameter, as the stiffness of the suspension spring in the semi-active suspension system, and the closed-loop controller are determined with the CID method. This leads to a closed-loop suspension system which in simulation, is shown to satisfy all four closed-loop performance specifications. Then the suspension system is redesigned with two closed-loop performance specifications, car body acceleration and energy of control effort, and through experimentation, the closed-loop performance is verified on suspension test bed. Both simulation and experimental results verify the effectiveness of the CID method, with two closed-loop performance specifications.

Keywords: closed-loop specifications; control system design; integrated design; mechanical structure parameters; semi-active suspension systems; vehicle design; vehicle control; car body acceleration; suspension deflection; tyre dynamic load; control effort; simulation.

DOI: 10.1504/IJVD.2006.010436

International Journal of Vehicle Design, 2006 Vol.42 No.3/4, pp.328 - 347

Available online: 21 Jul 2006 *

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