Semi-Active suspensions - a comparison between theory and experiments

R. Rajamani, J. K. Hedrick

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


A full-scale half car suspension test rig is used to evaluate the performance of switchable dampers in semi-active control. A theoretical model is developed for the test rig and its parameters are identified. Two types of switchable shocks are used. A low bandwidth tri-state damper originally designed for manual setting changes is shown to be too slow for real-time ride quality improvement. Semi-active control is successfully demonstrated with a high bandwidth multi-state damper. Conventional ON-OFF, optimal ON-OFF, optimal multi-state control and a robust form of multi-state control are implemented and compared. Semi-active control is shown to give a performance as good as the best of all available passive states at every frequency. Trends in the experimental results are accurately predicted by the theoretical model.

Original languageEnglish (US)
Pages (from-to)504-518
Number of pages15
JournalVehicle System Dynamics
Issue numbersup1
StatePublished - Jan 1 1992
Externally publishedYes

Bibliographical note

Funding Information:
ACKNOWLEDGEMENTS The authors wish to thank the Mazda Motor Co., Japan, for supporting this research and the Lord Corporation,Erie, Pa, USA, for providing the multi-state damper.


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