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Design and Analysis of a Nonlinear Observer for a Hydraulic Servo System
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Systemteknik.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Systemteknik.
2007 (English)In: Proceedings of 7:th IFAC Symposium on Nonlinear Control Systems, 2007Conference paper, Published paper (Refereed)
Abstract [en]

A nonlinear observer with static feedback is investigated as a tool for leakage detection in a hydraulic servo system with velocity feedback, frequently employed in vehicular technology. It is shown that, under reasonable assumptions, the estimation error dynamics have only one feasible stationary point and that is in the origin. Furthermore, the stationary point can be asymptotically stabilized by static observer feedback. Simulations indicate that the observer reliably detects and isolates hydraulic fluid leakage of two different kinds and possesses appealing convergence and parameter robustness properties.

Place, publisher, year, edition, pages
2007.
Keyword [en]
Hydraulic actuators, observers, nonlinear systems, fault detection
Identifiers
URN: urn:nbn:se:uu:diva-14193OAI: oai:DiVA.org:uu-14193DiVA: diva2:41963
Available from: 2008-01-29 Created: 2008-01-29

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Werlefors, MariaMedvedev, Alexander

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