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Abstract

The mesh-type harmonic piezoelectric motor has advantages of low speed, large torque and long lifetime. However, the nonlinear axial forces of driving part affect the dynamic performance of the motor, which can result in a motor with a deteriorated load-capability. Hence, to deal with the above problem, the effects of nonlinear axial forces on chaotic vibration are investigated in this paper. Firstly, applying dynamic theory of continuous system, the nonlinear dynamic equations contains nonlinear axial forces of the driving system for a mesh-type piezoelectric motor are established. And then, using Runge-Kutta numerical method, the effects of nonlinear axial forces on chaotic vibrations of the system are investigated. The results show that the chaotic vibrations occur in driving system of the motor under some parameters. The vibration displacements of the driving system become larger when considering nonlinear axial forces of displacement amplification mechanism. Under the effect of nonlinear axial forces, the chaotic vibrations occur easily when the system parameter is much smaller. The results can be used to predict the dynamic load and optimize power density of the mesh-type harmonic piezoelectric motor.

Keywords

Chaotic vibration piezoelectric motor nonlinear axial forces nonlinear dynamic

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Effects of nonlinear axial forces on chaotic vibration for a mesh-type harmonic piezoelectric motor

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