This paper focusses on the Sliding Mode Control (SMC) of a servo-driven dry-friction damper employed in a force control loop for the purpose of vibration reduction. An application to a car suspension is investigated using a quarter car model.

The friction damper is a semi-active device: it can only oppose to the motion but not assist it. This inherent limitation requires particular attention in the design of the sliding surfaces. The performance of various types of sliding surface are compared, by means of computer simulation.

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