This paper focuses on an experimental implementation of a semiactive seat suspension using magnetorheological (MR) dampers. We first introduce the nonlinear dynamics phenomena induced by skyhook control. Skyhook control has been widely applied to applications ranging from structural vibration suppression to commercialized vehicle suspensions. Unfortunately, skyhook control generates superharmonic dynamics; yet, this issue has not been clearly addressed in such vibration control systems. This paper will attempt to explain how superharmonics are created with skyhook controls through analysis of test data. Furthermore, a nonlinear model-based adaptive control algorithm is developed and evaluated for reducing the negative impact of the superharmonics. Based on an empirical MR damper model, the adaptive algorithm is expanded mathematically, and the system stability is discussed. Then in the following sections, this paper describes implementation procedures such as modeling simplification and validation, and testing results. Through the laboratory testing, the adaptive suspension is compared to two passive suspensions: hard-damping (stiff) suspension with a maximum current of to the MR damper and low-damping (soft) suspension with a low current of , while broadband random excitations are applied with respect to the seat suspension resonant frequency in order to test the adaptability of the adaptive control. In two separate studies, both mass and spring rate are assumed known and unknown in order to investigate the capability of the adaptive algorithm with the simplified model. Finally, the comparison of test results is presented to show the effectiveness and feasibility of the proposed adaptive algorithm to eliminate the superharmonics from the MR seat suspension response.
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November 2007
Technical Papers
Analysis and Strategy for Superharmonics With Semiactive Suspension Control Systems
Xubin Song, Ph.D.,
Xubin Song, Ph.D.
Principal Engineer
Eaton Corporation
, Eaton Innovation Center, 26201 Northwestern Highway, Southfield, MI 48076
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Mehdi Ahmadian, Ph.D.,
Mehdi Ahmadian, Ph.D.
Professor Director
Center for Vehicle Systems and Safety
, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060-0238
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Steve Southward, Ph.D.
Steve Southward, Ph.D.
Associate Professor
Virginia Institute for Performance Engineering and Research
, Department of Mechanical Engineering, Virginia Tech, Danville, VA 24540
Search for other works by this author on:
Xubin Song, Ph.D.
Principal Engineer
Eaton Corporation
, Eaton Innovation Center, 26201 Northwestern Highway, Southfield, MI 48076
Mehdi Ahmadian, Ph.D.
Professor Director
Center for Vehicle Systems and Safety
, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24060-0238
Steve Southward, Ph.D.
Associate Professor
Virginia Institute for Performance Engineering and Research
, Department of Mechanical Engineering, Virginia Tech, Danville, VA 24540J. Dyn. Sys., Meas., Control. Nov 2007, 129(6): 795-803 (9 pages)
Published Online: January 19, 2007
Article history
Received:
January 26, 2006
Revised:
January 19, 2007
Citation
Song, X., Ahmadian, M., and Southward, S. (January 19, 2007). "Analysis and Strategy for Superharmonics With Semiactive Suspension Control Systems." ASME. J. Dyn. Sys., Meas., Control. November 2007; 129(6): 795–803. https://doi.org/10.1115/1.2789470
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