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TECHNICAL BRIEFS

Parameter Identification for a High-Performance Hydrostatic Actuation System Using the Variable Structure Filter Concept

[+] Author and Article Information
S. R. Habibi, R. Burton

 McMaster University, 1280 Main St., West Hamilton, ON, Canada University of Saskatchewan, 57 Campus Drive, Saskatoon, SK, Canada

J. Dyn. Sys., Meas., Control 129(2), 229-235 (May 24, 2006) (7 pages) doi:10.1115/1.2431816 History: Received August 26, 2004; Revised May 24, 2006

Parameter estimation is an important concept that can be used for health and condition monitoring. Estimation or measurement of physically meaningful parameters and their evaluation against predetermined thresholds allows detection of gradual or abrupt deteriorations in the plant. This early detection of faults enables preventative unscheduled maintenance that is of benefit to industries concerned with reliability and safety. In this paper, a recently proposed state estimation strategy referred to as the smooth variable structure filter (SVSF) is reviewed and extended to parameter estimation. The SVSF is applied to a novel hydrostatic actuation system referred to as the electrohydraulic actuator (EHA). Condition monitoring of the EHA for preventative unscheduled maintenance would increase its safety in applications pertaining to aerospace and would reduce its operational and maintenance costs.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Electrohydraulic actuator

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Figure 3

Step response of the EHA prototype (8)

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Figure 4

SVSF state estimation concept

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Figure 5

Actual and estimated states: (a) Actual and estimated states associated with position, (b) actual and estimated states associated with velocity, (c) actual and estimated states associated with acceleration, and (d) actual and estimated states associated with the effective bulk modulus

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