Abstract
As a kind of promising noncontact bearings, ultrasonic bearings actuated by smart materials such as lead zirconate titanate ceramics show a good application prospect in high-speed machines and precision-measuring devices. The suspending force is one of the most important parameters that play a dominated role on the bearing’s static and dynamic performance. A suspending force model based on acoustic radiation theory for cylindrical object near sound source is built to predict the radial carrying capacity of an ultrasonic bearing actuated by three piezoelectric transducers. To validate the model, an ultrasonic bearing prototype is developed and a testing system is established. For observing the bearing’s dynamic running performance at high speeds, the bearing’s running experiment is carried out and the rotor center’s trajectory data and frequency spectrum are acquired to analyze the bearing’s dynamic characteristics at high speeds. The suspending force model and running performance experiments will contribute to the design, detection, and test of this type of bearings.
Highlights
Since conventional contact-type bearings such as deep groove ball bearings and roller bearings usually generate vibration, noise, and overheat when they run at high speeds,[1,2,3] the noncontact-type bearings have a widespread application in industrial fields especially for high-speed occasions due to their small frictional force and high limit speed
According to the established suspending force model based on acoustic radiation theory in terms of cylindrical object near sound source and taking the surface topography’s effect on suspending process into account, the theoretical result of the bearing’s suspending force can be calculated
The surface topography exerts a significant impact on the bearing’s suspending force model when the suspending height is in a range from 15 to 25 mm
Summary
Since conventional contact-type bearings such as deep groove ball bearings and roller bearings usually generate vibration, noise, and overheat when they run at high speeds,[1,2,3] the noncontact-type bearings have a widespread application in industrial fields especially for high-speed occasions due to their small frictional force and high limit speed. Keywords Ultrasonic bearings, piezoelectric transducers, acoustic suspending force, dynamic characteristics For the purpose of observing the bearing’s running performance, the rotor center’s trajectory data are extracted and analyzed to investigate the bearing’s dynamic characteristics under radial suspending force when the bearing runs at high speeds.
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