Friction Layer Analysis of a Surface Acoustic Wave Motor

Abstract

This study applied appropriate assumptions to simplify a surface acoustic wave (SAW) motor model, as well as the elastic friction layer concept to analyze the two-dimensional contact problem. The effect of inertial force was factored into the equation of motion for the friction layer; the relationship between external force and the displacement of the friction layer surface was determined via Fourier transform; and the displacement field under different loads was analyzed using numerical methods. Based on the friction theory proposed by Armstrong, the relative velocity of the friction layer between the slider and stator was considered in the relationship between the normal and tangential forces acting on both contact surfaces. Finally, the deformation and the contact forces acting on the friction layer were evaluated by assuming the displacement of the stator substrate.