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Research Papers

Static Output Feedback Control for Electrohydraulic Active Suspensions via T–S Fuzzy Model Approach

[+] Author and Article Information
Haiping Du

Mechatronics and Intelligent Systems, Faculty of Engineering, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australiahdu@eng.uts.edu.au

Nong Zhang

Mechatronics and Intelligent Systems, Faculty of Engineering, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australianong.zhang@uts.edu.au

J. Dyn. Sys., Meas., Control 131(5), 051004 (Aug 17, 2009) (11 pages) doi:10.1115/1.3117194 History: Received November 26, 2007; Revised December 18, 2008; Published August 17, 2009

The paper presents a fuzzy static output feedback controller design approach for vehicle electrohydraulic active suspensions based on Takagi–Sugeno (T–S) fuzzy modeling technique. The T–S fuzzy model is first applied to represent the nonlinear dynamics of an electrohydraulic suspension. Then, the fuzzy static output feedback controller is designed for the obtained T–S fuzzy model to optimize the H performance of ride comfort through the parallel distributed compensation scheme. The sufficient conditions for the existence of such a controller are derived in terms of linear matrix inequalities (LMIs) with an equality constraint. A computational algorithm is presented to convert the equality constraint into a LMI so that the controller gains can be obtained by solving a minimization problem with LMI constraints. To validate the effectiveness of the proposed approach, two kinds of static output feedback controllers, which use suspension deflection and sprung mass velocity, and suspension deflection only, respectively, as feedback signals, are designed. It is confirmed by the simulations that the designed controllers can achieve good suspension performance similar to that of the active suspension with optimal skyhook damper.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Quarter-car suspension model

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Figure 2

Sprung mass acceleration (Case 1)

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Figure 3

Sprung mass displacement (Case 1)

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Figure 4

Actuator output force (Case 1)

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Figure 5

Actuator control input voltage and nonlinear function value (Case 1)

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Figure 6

Sprung mass acceleration (Case 2)

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Figure 7

Sprung mass displacement (Case 2)

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Figure 8

Actuator output force (Case 2)

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Figure 9

Actuator control input voltage and nonlinear function value (Case 2)

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