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Proceedings Paper

Temperature sensitive stability of feedback controllers for MR dampers
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Paper Abstract

Smart fluid dampers can undergo large temperature changes due to the heating associated with energy dissipation. Such heating will alter the fluid's properties and could degrade control system performance. For example, previous work by the authors has shown that the stability of an MR damper under feedback control is dependent on the fluid's compressibility and viscosity. In the present study, a temperature dependent model of a magnetorheological damper is developed from experimental data, and it is shown that the fluid's yield stress, viscosity and compressibility parameters vary significantly. An experimental and numerical control study is then performed to investigate the resulting effects of temperature on the stability of two feedback controllers - a PID controller, and a proportional controller. Experimental results indicate that both controllers can exhibit a reduction in stability with increasing temperature, particularly if the controller gains are not suitably chosen. The temperature dependent MR damper model predicts this behaviour well, and it is shown that the change in viscosity has the most significant effect on stability. Future work could focus on the resulting effect on a complete vibration system, devices with different modes of operation, and alternative controllers.

Paper Details

Date Published: 18 April 2008
PDF: 11 pages
Proc. SPIE 6928, Active and Passive Smart Structures and Integrated Systems 2008, 69281B (18 April 2008); doi: 10.1117/12.775411
Show Author Affiliations
D. C. Batterbee, The Univ. of Sheffield (United Kingdom)
N. D. Sims, The Univ. of Sheffield (United Kingdom)

Published in SPIE Proceedings Vol. 6928:
Active and Passive Smart Structures and Integrated Systems 2008
Mehdi Ahmadian, Editor(s)

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