Non-smooth model and numerical analysis of a friction driven structure for piezoelectric motors

TL;DR

This paper develops a non-smooth dynamic model for a friction-driven structure in piezoelectric motors, analyzing contact regimes and operation modes to inform better design and performance optimization.

Contribution

It introduces a two-degree-of-freedom model with unilateral contact, analyzing contact regime transitions and their effects on motor operation modes.

Findings

Different contact regimes identified and analyzed.

Operation modes depend on system parameters.

Design recommendations for friction-driven structures provided.

Abstract

In this contribution, typical friction driven structures are summarized and presented considering the mechanical structures and operation principles of different types of piezoelectric motors. A two degree-of-freedom dynamic model with one unilateral frictional contact is built for one of the friction driven structures. Different contact regimes and the transitions between them are identified and analyzed. Numerical simulations are conducted to find out different operation modes of the system concerning the sequence of contact regimes in one steady state period. The influences of parameters on the operation modes and corresponding steady state characteristics are also explored. Some advice are then given in terms of the design of friction driven structures and piezoelectric motors.