Smart foil journal bearing using piezoelectric actuators

摘要

The present invention relates to a smart foil journal bearing using a piezoelectric actuator in which to install the piezoelectric actuator on the back side of the foil to increase the load carrying capacity of the bearing, by controlling the variation in the critical speed to remove the instability of the bearing.; The invention is, wherein a plurality of the yeophyeong foil 20 or the foil journal bearing that has a single top foil (40) to form an air film supporting the rotary shaft on an inner peripheral surface of the bearing housing 30 yeophyeong foil (20 ) or the rear side of the top foil 40, but additional installation to distribute the plurality of piezoelectric devices to the inner peripheral surface of the rotary shaft 10, the bearing housing 30 to be added to the threshold speed during the stiffness and damping of the piezoelectric drive apparatus,; The piezoelectric actuator is inserted into a groove 34 formed in a plurality pieces distributed on the inner circumferential surface of the bearing housing 30, the piezoelectric actuator (100) having at least one piezoelectric element;; To the bearing by applying a voltage required for the piezoelectric actuator (102) comprises an elastic spring 110, which are respectively interposed between the piezoelectric actuator 100 and the piezoelectric actuator groove 34 give rigidity (stiffness) characterized in that the added stiffness and damping.