Semiactive and Active Suspensions for Vehicle Ride Control Using Velocity Feedback

Abstract

This paper discusses the application of velocity feedback systems to the control of vehicle ride. The first is a semiactive damper with an adjustable damping coefficient. The damping may be switched from low to high or vice versa through continuous paths. The second is an active damper whose control force is derived from velocity signals. Both control systems could be used when full-state information is not available. The effect of high damping levels and control valve switching time of the semiactive damper on the ride performance is examined. The controller for the active damper is developed from second-order equations. By assuming the road profile as a random noise, the power spectral density is computed and compared with that of full-state systems. A quarter-car model is used for the simulation.

Keywords

Semiactive and active suspensions damping control ride quality

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