Modeling and simulation of the equivalent material damping loss factor of fixed joint interface

Abstract

The damping characteristics of the joint interfaces affect the dynamic behaviors of a whole accurate machine construction notably. An equivalent material damping model between the joint interfaces under the tangential force is established based on contact theory and micro-slip theory. A quantitative analysis of the damping which is characterized by the equivalent loss factor β is presented. Through the numerical simulation, the influences of the joint parameters (such as tangential force, normal force, and friction factor) on damping loss factor are investigated. The numerical simulation result shows that under the condition of micro-slip (T < μP), the equivalent damping loss factor increases with the tangential force growing but decreases as normal force and friction factor increase. Finally, through comparison with traditional joint interface model, the effectiveness of the equivalent damping model has been verified.