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Nonlinear analysis of switched semi-active controlled systems

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Abstract:

Semi-active systems improve suspension performance of the vehicles more effectively than conventional passive systems by simultaneously improving ride comfort and road handling. Also, because of size, weight, price and performance advantages, they have gained more interest over the active as well as passive systems. Probably the most neglected aspect of the semi-active on-off control systems and strategies is the effects of the added nonlinearities of those systems, which are introduced and analysed in this paper. To do so, numerical techniques, analytical method of averaging and experimental analysis are deployed. In this paper, a new method to analyse, calculate and compare the performances of the semi-active controlled systems is proposed; further, a new controller based on the observations of actual test data is proposed to eliminate the adverse effects of added nonlinearities. The significance of the proposed new system is the simplicity of the algorithm and ease of implementation. In fact, this new semi-active control strategy could be easily adopted and used with most of the existing semi-active control systems.

Keywords: averaging method; nonlinear suspension; semi active; semi-active control; suspension system

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/00423110903401871

Affiliations: 1: Mechanical Engineering, University of Waterloo, Waterloo, Ontario, Canada 2: School of Engineering Science, Simon Fraser University, Vancouver, British Columbia, Canada

Publication date: January 1, 2011

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