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research-article

3D Wear Prediction of 4-DOF Parallel Mechanism with Clearance Spherical Joint and Flexible Moving Platform

[+] 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, China
wanggengxiang@xaut.edu.cn

Hongzhao Liu

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

1Corresponding author.

ASME doi:10.1115/1.4038806 History: Received August 15, 2017; Revised December 18, 2017

Abstract

Three-dimensional (3D) wear of the clearance spherical joint in 4-DOF parallel mechanism is predicted based on Archard's wear model. The flexible moving platform is treated as thin plate element based on Absolute Nodal Coordinate Formulation. The tangent frame is introduced to formulate the constraint equation of universal joint. One of the spherical joints is treated as clearance joint. The normal and tangential contact forces are calculated based on Flores contact force model and modified Coulomb friction model. In order to predict 3D wear, the normal contact force, tangential contact velocity and eccentricity vector are decomposed in the global coordinate system. Simulations show that 3D wear occurred in three directions are not uniform each other.

Copyright (c) 2017 by ASME
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