COMBINED PIEZOELECTRIC-HYDRAULIC ACTUATOR BASED ACTIVE VIBRATION CONTROL FOR ROTORDYNAMIC SYSTEM

Previous research by the authors concentrated on using piezoelectric a ctuators for active vibration control (AVC) of rotating machinery. The current work extends this by positioning the piezo-actuator remotely from the controlled structure and transmitting the control force via a hydraulic line and two pistons. Liquid plastic (LP) is employed as tr ansmission ''fluid'' to obtain a high bulk modulus and low leakage. Th e paper presents results for bulk moduli measurement, and bench and ri g tests for the entire actuator system. These results show the high ef fectiveness of the hybrid actuator for controlling vibrations on a lab oratory rotor test rig.