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Abstract
A Variable Structure Model Reference Adaptive Controller (VS-MRAC) is proposed for the active control of vehicle suspension with preview. A two DOF quarter car model has been considered. The reference model is also a two DOF vibrating system with a skyhook damper. The structure of the switching functions is designed, based on global exponential stability requirements, and shows perfect model following at a finite time. Sliding surfaces are independent of system parameters and, therefore, VS-MRAC is insensitive to system parameter variations. Simulation is presented for some road irregularities, and compares to active suspension with fixed structure MRAC, and passive suspension. VS-MRAC shows the best performance on ride and working space.
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