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Dynamic Analysis and Wear Prediction of Planar Five-bar Mechanism Considering Multi-Flexible Links and Multi-Clearance Joints

[+] Author and Article Information
Gengxiang Wang

Faculty of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, P.O. Box 373, Xi'an, Shaanxi 710048, PR China
wanggengxiang27@163.com

Hongzhao Liu

Faculty of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, P.O. Box 373, Xi'an, Shaanxi 710048, PR China
liu-hongzhao@163.com

1Corresponding author.

ASME doi:10.1115/1.4035478 History: Received August 12, 2016; Revised November 30, 2016

Abstract

Effect of wear and member flexibility on the dynamic performance of a planar five-bar mechanism with joint-clearance are investigated. The equation of motion of the mechanism is derived based on the absolute nodal coordinate formulation. In order to enhance the accuracy of the contact force, the slope of the load-displacement curve of the cylindrical joint with clearance is used. The contact deformation couples the joint wear to the contact state. The contact force model of Flores and co-workers is improved, by the introduction of the stiffness coefficient. The wear depth is predicted by using the Archard's wear model. Simulations show that the multi clearance joints can generate stronger contact forces relative to single clearance joint case. This leads to more serious wear in the joint. However, the mechanism with multiple flexible links can absorb more of the energy arising from the clearance joint, and this improve the wear phenomenon.

Copyright (c) 2016 by ASME
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