Practical consideration of shear strain correction factor and Rayleigh damping in models of piezoelectric transducers

A number of papers address the analytical modelling of piezoelectric transducers and, in particular, of travelling wave ultrasonic motors. Most of them focus on the complex electro-mechanical modelling of the motor stator. In this paper, the practical consideration of shear strain correction factor and an experimental introduction of structural damping in analytical models is introduced. First, the analytical model is briefly introduced and then, the proposed introduction of viscous damping is based on a two-coefficient Rayleigh model. Experimental verification is reported. It includes two experimental ultrasonic motor stators. In addition, the simulation results are compared with that of the state-of-the-art FEM results.