A novel acoustic model for interface stiffness measurement of dry tribological interface considering geometric dispersion effect and boundary effect

Abstract

This paper proposed an acoustic model of ultrasonic transmission with the dry tribological interface considering the geometric dispersion effect and the boundary effect. Poisson's ratio is introduced into the Hamiltonian expression, which establishes the energy propagation characteristics of tribological interface. Based on microwave theory, the boundary effect of ultrasonic propagation is analyzed, which simulates the influence of impedance mismatch at the boundary. The feasibility of the proposed model for interface stiffness measurement was validated experimentally. Compared with the classical model, the proposed model has higher accuracy. Finally, this paper discussed influence of boundary parameters. It is theoretically explained that the transmission method is more sensitive than the reflection method. This study provides a basis of the interface stiffness measurement.