This paper presents two alternative implementations of skyhook control, named “skyhook function” and “no-jerk skyhook,” for reducing the dynamic jerk that is often experienced with conventional skyhook control in semiactive suspension systems. An analysis of the relationship between the absolute velocity of the sprung mass and the relative velocity across the suspension are used to show the damping-force discontinuities that result from the conventional implementation of skyhook control. This analysis shows that at zero crossings of the relative velocity, conventional skyhook introduces a sharp increase (jump) in damping force, which, in turn, causes a jump in sprung-mass acceleration. This acceleration jump, or jerk, causes a significant reduction in isolation benefits that can be offered by skyhook suspensions. The alternative implementations of skyhook control included in this study offer modifications to the formulation of conventional skyhook control such that the damping force jumps are eliminated. The alternative policies are compared to the conventional skyhook control in the laboratory, using a base-excited semiactive system that includes a heavy-truck seat suspension. An evaluation of the damping force, seat acceleration, and the electrical currents supplied to a magnetorheological damper, which is used for this study, shows that the alternative implementations of skyhook control can entirely eliminate the damping-force discontinuities and the resulting dynamic jerks caused by conventional skyhook control.
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October 2004
Technical Briefs
No-Jerk Skyhook Control Methods for Semiactive Suspensions
Mehdi Ahmadian, Professor, Fellow ASME,
Mehdi Ahmadian, Professor, Fellow ASME
Center for Vehicle Systems and Safety, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061
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Xubin Song, Mem. ASME,
Xubin Song, Mem. ASME
Visteon Corporation, 6100 Mercury Dr., Dearborn, MI 48126
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Steve C. Southward, Mem. ASME
Steve C. Southward, Mem. ASME
Lord Corporation, 100 Lord Drive, Cary, NC
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Mehdi Ahmadian, Professor, Fellow ASME
Center for Vehicle Systems and Safety, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061
Xubin Song, Mem. ASME
Visteon Corporation, 6100 Mercury Dr., Dearborn, MI 48126
Steve C. Southward, Mem. ASME
Lord Corporation, 100 Lord Drive, Cary, NC
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received November 2003; final revision, February 2004. Associate Editor: Lawrence A. Bergman.
J. Vib. Acoust. Oct 2004, 126(4): 580-584 (5 pages)
Published Online: December 21, 2004
Article history
Received:
November 1, 2003
Revised:
February 1, 2004
Online:
December 21, 2004
Citation
Ahmadian, M., Song, X., and Southward, S. C. (December 21, 2004). "No-Jerk Skyhook Control Methods for Semiactive Suspensions." ASME. J. Vib. Acoust. October 2004; 126(4): 580–584. https://doi.org/10.1115/1.1805001
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