Research on Bearing Capacity Parameters of Radial Enveloping Ultrasonic Levitation Bearing

Based on the principle of piezoelectric driving and ultrasonic near-field levitation technology, this paper designs a piezoelectrically driven ultrasonic levitation bearing, which is mainly composed of a rectangular piezoelectric sheet and a metal cylinder. The piezoelectric sheet drives cylinder wall to squeeze air in bearing gap under the action of high-frequency alternating voltage to form a gas squeezed film. According to the theory of viscous fluid mechanics, squeeze film Reynolds equation is derived. From the equation, it can be seen that cylinder radial deformation and squeeze number are the key parameters that determine the bearing capacity of gas squeeze film. With finite element software, radial deformation displacement function of cylinder is obtained, and the relationship between squeeze number and bearing capacity is analyzed by solving Reynolds equation. Based on above simulation and theoretical analysis, bearing is studied experimentally. The experimental results prove that theoretical calculation method is accurate, which has guiding significance for theoretical research and structural design of ultrasonic levitation bearings.