Research on rotating speed of a squeeze-film driven rotor based on near-field acoustic driving

This work deals with the dynamics of a levitated rotor, which is also rotated by a fluid squeeze film created by a vibrating cylinder type stator. The model, which describes the transient behavior of the rotation of a rotor, by means of the squeeze film generated by a traveling flexural wave of the stator surface, is presented. In such problems, the control equations of fluid in the squeeze film are firstly simplified on the basis of several reasonable assumptions. These equations, together with control equation of the rotor, are solved by using explicit finite difference methods. Then, the vibration mode of pressure at the stable time and the transient rotating speed of the rotor with time are evaluated. Finally, the rotating speeds, with different parameters of vibration of the stator, the squeeze film and inertial moment of the rotor, are compared in order to study how to effectively increase and control the rotating speed. This paper will provide the foundations to study the driving technology of squeeze film and will be helpful in the design and application of non-contact ultrasonic actuators.