Affiliation of Author(s):航空学院

Journal:SMART MATERIALS AND STRUCTURES

Key Words:linear ultrasonic motor linear rolling guide contact stiffness dynamic modeling output performance

Abstract:In this article, a favorable dynamical model for linear ultrasonic motor (LUSM) is proposed to investigate the influence of the slider movement characteristic. Linear rolling guide is the common structure as a slider in LUSM, and it also is used in this study. Based on Hertz contact theory and the coulomb's friction law, contact mechanics and contact stiffness between the rolling balls and raceway has been analyzed. Then the dynamic model for LUSM considering the contact stiffness is obtained. In particular, the contact stiffness on the load direction will changed by the sliding of the slider during the motion of LUSM. Moreover, the output performance of LUSM has been analyzed by the suggested model. There is a speed fluctuation caused by the different internal contact stiffness of the slider periodically, affected the positioning accuracy of the LUSM. Furthermore, an experiment is designed to verify the feasibility and effectiveness of this proposed model by comparing the simulation results with the measured one. The results show that the proposed model is more accurate than the traditional model to evaluate the variation of output performance of the motor caused by the linear rolling guide movement. These discussions will be very useful for the improvement of control and the optimal design of LUSM.

ISSN No.:0964-1726

Translation or Not:no

Date of Publication:2019-10-01

Co-author:Dai, Shichao,Zhou, Lifeng,He, Ying

Correspondence Author:yao zhiyuan