Smart foil journal bearing using piezoelectric actuators

摘要

PURPOSE: A smart foil journal bearing using piezoelectric actuator is provided to improve load carrying capacity, to control range of critical speed on axial rotary movement and to remove instability over critical speed. CONSTITUTION: A bearing includes a plurality of piezoelectric actuating devices distributed and installed on an inner circumferential surface of a bearing housing(30) behind multileaf foils(20) or top foils(40) and including piezoelectric actuators(100) inserted to piezoelectric actuator grooves(34) formed on the inner circumferential surface of the bearing housing and having more than one piezoelectric actuating elements(102a,102b,102c,102d) and elastic springs(110) interposed between the piezoelectric actuators and the piezoelectric actuator grooves to give stiffness so as to impress voltage to the piezoelectric actuators and provide stiffness and damping to the bearing.