Title: Fractional PI^λD^μ control and optimisation for vehicle active suspension

Authors: Long Zhi, Yunqing Zhang, Liping Chen, Jingzhou (James) Yang

Addresses: Center for Computer Aided Design, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. ' Center for Computer Aided Design, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. ' Center for Computer Aided Design, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. ' Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409, USA

Abstract: This paper presents an active suspension for a quarter-car model with two Degrees Of Freedom (DOF) using a fractional I^λD^μ controller. The active control is expressed as the summation of PI^λ and PD^μ, which use vertical acceleration of the body and suspension deflection, respectively, as input variables. The parameters of the controller are optimised using a Genetic Algorithm (GA). The simulation results indicate that the fractional PI^λD^μ controller for the suspension system is effective in the vibration isolation of the vehicle body and has better performance than the classical PID controller.

Keywords: fractional PI^λD^μ; active suspension; optimisation; GAs; genetic algorithms; vehicle suspension; quarter-car models; PID control; vibration isolation.

DOI: 10.1504/IJVAS.2008.023581

International Journal of Vehicle Autonomous Systems, 2008 Vol.6 No.3/4, pp.276 - 287

Published online: 02 Mar 2009 *

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