Stability of Hydraulic Motion Control Systems

[+] Author and Article Information
D. L. Margolis, C. Hennings

Department of Mechanical Engineering, University of California, Davis, Davis, CA 95616

J. Dyn. Sys., Meas., Control 119(4), 605-613 (Dec 01, 1997) (9 pages) doi:10.1115/1.2802368 History: Received April 26, 1994; Online December 03, 2007


High performance hydraulic motion control systems typically consist of a two-stage spool valve which controls flow into an actuator. Feedback of load motion allows an electrical signal into the valve to control large amounts of hydraulic power. These servo-systems are well known to exhibit an instability where they “sing” or “chirp” at high frequency. This instability seems to be configuration-dependent. Here, two submodels are proposed that expose a fluid flow induced instability, and a mechanical instability. The result is parameter groupings which expose these instabilities in a fundamental way.

Copyright © 1997 by The American Society of Mechanical Engineers
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