Wear Prediction and Chaos Identification of Rigid Flexible Coupling Multi-link Mechanisms with Clearance

Abstract

Traditional revolute clearance joint assumes that the shape of contact surface of joint is regular and ignores the effect of wear, which reduces prediction accuracy of dynamics model. To accurately describe collision behavior of motion pair, Archard formula was applied to construct a wear clearance model. Based on absolute node coordinate method, multi-body dynamics modeling, wear prediction, and chaotic identification analysis methods for a flexible multi-link mechanism with clearance considering wear effect were proposed. The research results indicate that wear intensifies the irregularity of clearance surface contour, leading to an increase in instability of the dynamic response and a decrease in motion accuracy of mechanism. The existence of smaller clearance values and slower driving speeds can effectively reduce dynamic deviation of mechanisms, improve motion accuracy and stability of mechanism, and alleviate chaotic phenomenon of mechanism. The variation laws of wear depth with driving speed and clearance value, as well as wear prediction of the motion pair were analyzed and obtained.