A Linearized Electrohydraulic Servovalve Model for Valve Dynamics Sensitivity Analysis and Control System Design

[+] Author and Article Information
Dean H. Kim

Department of Mechanical Engineering, Bradley University, Peoria, IL 61625

Tsu-Chin Tsao

Mechanical & Aerospace Engineering Department, University of California, Los Angeles, Los Angles, CA 90095-1597

J. Dyn. Sys., Meas., Control 122(1), 179-187 (Feb 02, 1998) (9 pages) doi:10.1115/1.482440 History: Received February 02, 1998
Copyright © 2000 by ASME
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Electrohydraulic servo actuator
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Control system block diagram
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Frequency responses of the servovalve
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Frequency responses of the actuator (dot line: 15 mV input; dash line: 50 mV input; solid line: model)
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Comparison of servovalve models (solid line: average of experimental data; dot line: second order model; dash line: third order model; dot-dash line: derived model)
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Mixed sensitivity problem as a standard problem
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Multiplicative uncertainties of the plant models (dash-dot line: Wr5; dot line: Wr6; dash line: Wr8)
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Performance weights and experimental sensitivites (dot line: using K5 from the second order model; dash line: using K6 from the third order model; solid line: using K8 from the derived fifth order model)
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Experimental step responses (dash-dot line: using K5; dot line: using K6; dash line: using K8; solid line: plant)



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