DYNAMIC ANALYSIS OF AN ACTIVE ISOLATION MOUNT USING FEEDFORWARD AND FEEDBACK CONTROL SCHEMES

摘要

This paper presents the simulation of dynamic analysis and performance of a 2-Degree-of-Freedom active vibration isolation system. Vibration isolation is studied on both feedforward and feedback schemes, exploiting their transmissibility reduction capabilities and different effects to the system dynamics. The 2-DoF system is mounted on the isolated structure of interest, while the disturbance is induced through the secondary structure. The two structures are connected with an active mount, where a passive spring-damper element and a piezoelectric actuator are parallelly placed. In feedforward approach, the optimal controller input is calculated a-priori and offline, while in the feedback scheme, LQR and Proportional-Derivative control algorithms are tested and compared. The results demonstrate great vibration suppression capabilities to the structure of interest, as both force transmissibility and displacement are considerably degraded.