Abstract
Fixed gain controllers, designed for a nominal system, degrade in performance whenthe system parameters are perturbed. By making the controller adaptive, idealperformance and granted stability of the closed loop system can be achieved for even alarge change in system parameters. In the present study, adaptive controllersbased on minimum variance, pole placement and linear quadratic techniquesare investigated. The controller based on minimum variance is noise sensitiveand the actuator voltage changes sign after each sampling interval. Hence, it isdetrimental to the life of piezoelectric actuators. An adaptive controller based on thepole placement technique requires high control effort and gives poor performanceat and near the nominal system. But linear quadratic control based adaptivecontrollers are noise tolerant and are free from the above-mentioned limitations.
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