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Proceedings Paper

Nonlinear MR model inversion for semi-active control enhancement
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Paper Abstract

The increased prevalence of semi-active control systems is largely due to the emergence of cost effective commercially available controllable damper technology such as Magneto-Rheological (MR) devices. Unfortunately, MR dampers are highly nonlinear, which presents an often over-looked complexity to the control system designer. The well-known Skyhook Damping control algorithm has enjoyed great success for both fully active and semi-active control problems. The Skyhook design strategy is to create a control force that emulates what a passive linear damper would create when connected to an inertial reference frame. Skyhook control is device independent since it generates a desired control force command output that must be produced by the control system. For simplicity, MR dampers are often assumed to have a linear relationship between the current input and the force output at a given relative velocity. Often this assumption is made implicitly and without knowledge of the underlying nonlinearity. In this paper, we show that the overall performance of a semi-active Skyhook control system can be improved by explicitly inverting the nonlinear relationship between input current and output force. The proposed modification will work with any semi-active control algorithm, such as Skyhook, to insure that the controller performance is at least as good as the performance without the proposed modification. This technique is demonstrated through simulation on a quarter-vehicle system.

Paper Details

Date Published: 6 April 2009
PDF: 12 pages
Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 72880P (6 April 2009); doi: 10.1117/12.817631
Show Author Affiliations
Daniel Reader, Virginia Polytechnic Institute and State Univ. (United States)
Steve C. Southward, Virginia Polytechnic Institute and State Univ. (United States)
Mehdi Ahmadian, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 7288:
Active and Passive Smart Structures and Integrated Systems 2009
Mehdi Ahmadian; Mehrdad N. Ghasemi-Nejhad, Editor(s)

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