Influence of the Disturbance Frequency on the Dynamic Characteristics of an Ultrasonic Gas Squeeze Film

摘要

Dynamic characteristics of an air ultrasonic squeeze film are affected by disturbance of the levitating object. A completely analytical model for the dynamic characteristics of the air squeeze film taking into consideration the effects of the disturbance acting on the levitating object was established by using compressible gas hydrodynamic lubricating theory. The models were solved by nonlinear numerical methods. Dynamic characteristics of the air squeeze film at specific cases were obtained and the effects of the disturbance amplitude and frequency on dynamic characteristics were discussed. It is found that these influences are significant. Experiments on stiffness and damping coefficients of the squeeze film measurement were carried out. The results showed some discrepancy with the theoretical values.