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Development of a systematic and practical methodology for the design of vehicles semi-active suspension control system

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Abstract:

In this paper, a novel systematic and practical methodology is presented for design of vehicle semi-active suspension systems. Typically, the semi-active control strategies developed to improve vehicle ride comfort and stability have a switching nature. This makes the design of the controlled suspension systems difficult and highly dependent on an extensive trial-and-error process. The proposed methodology maps the discontinuous control system model to a continuous linear region, where all the time and frequency design techniques, established in the conventional control system theory, can be applied. If the semi-active control system is designed to satisfy some ride and stability requirements, an inverse mapping offers the ultimate control law. At the end, the entire design procedure is summarised in six steps. The effectiveness of the proposed methodology in the design of a semi-active suspension system for a Cadillac SRX 2005 is demonstrated with road tests results. Real-time experiments confirm that the use of the newly developed systematic design method reduces the required time and effort in real industrial problems.

Keywords: Fuzzy systems; Skyhook control policy; nonlinear separation theorem; road test verification; semi-active suspension systems; sub-optimal Skyhook strategy; systematic approach

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/00423110902971809

Affiliations: 1: Mechanical and Mechatronics Engineering Department, University of Waterloo, ON, Canada 2: Computer Science Department, California Polytechnic State University, CA, USA 3: Mechatronics Systems Engineering, Simon Fraser University, Surrey, BC, Canada

Publication date: May 1, 2010

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