Fatigue Analysis of Suspension Control Arm Based on Road Spectrum

Abstract

Aiming at precisely predicting fatigue life for suspension control arm, a fatigue life analysis method is presented. First of all, 2D road spectrum is structured using Sayers. Then, a rigid-flexible coupling multi-body model is built for vehicle dynamics simulation based on ADAMS software. Automobile test is simulated and the time-load histories of each connecting point of the suspension control arm are obtained. By means of the rain flow counting method, fatigue analysis load spectrums are obtained. Finally, the fatigue life of the control arm is analyzed. The result of fatigue life analysis shows that the control arm is designed to meet the requirements of durability.