Piezoelectric actuators in the active vibration control system of journal bearings

[摘要] The advantage of journal hydrodynamic bearings is high radial load capacity and operation at high speeds. The disadvantage is the excitation of vibrations, called an oil whirl, after crossing a certain threshold of the rotational speed. The mentioned vibrations can be suppressed using the system of the active vibration control with piezoactuators which move the bearing bushing. The motion of the bearing bushing is controlled by a feedback controller, which responds to the change in position of the bearing journal which is sensed by a pair of capacitive sensors. Two stacked linear piezoactuators are used to actuate the position of the bearing journal. This new bearing enables not only to damp vibrations but also serves to maintain the desired bearing journal position with an accuracy of micrometers. The paper will focus on the effect of active vibration control on the performance characteristics of the journal bearing.

[发布机构] Faculty of Mech Engineering, VSB - Technical University of Ostrava, 17. listopadu 15, Ostrava; CZ 708 33, Czech Republic^1;TECHLAB Ltd., Sokolovská 207, Praha 9; CZ 190 00, Czech Republic^2

[效力级别] 无线电电子学

[关键词] Active vibration control systems;Active vibration controls;Bearing journals;Damp vibrations;Feedback controller;Hydrodynamic bearings;Performance characteristics;Rotational speed