Adaptive control of an active mount for shipboard equipment subjected to broadband excitation

Abstract

In this work, a new active mount featuring piezostack actuators and a rubber element is proposed, and its vibration control performance is evaluated by implementing an adaptive controller. The proposed mount is designed for particular applications that require high-performance isolation against broadband excitation, such as vibration-sensitive shipboard equipment. After describing the configuration of the proposed mount, the design and manufacture of the rubber element and piezostack actuators are described. A vibration control system is then constructed, in which the proposed mount is loaded with a lumped mass subjected to base excitations. To attenuate vibrations on the supported mass, an adaptive frequency-shaped sliding mode controller is formulated based on the Lyapunov's theorem. In the presence of inexactly known parameters, the proposed controller tends to drive the system to a desired dynamic while the system parameters are updated by adaptive laws. Finally, the controller is experimentally realized, and vibration control performances are evaluated in time and frequency domains.