Abstract：To solve the problem of fractured truck horn stand, the virtual iteration technique combined with finite element method (FEM) was used to analyze the fatigue life of horn stand. The neutral files of half frame and cab were established based on the FEM modal analysis. The multibody dynamic model of flexible frame, cab and virtual test rig was established by rigid flexible coupling modeling method. Virtual iteration technique was utilized to obtain the corresponding load spectrums of horn stand and the fatigue analysis of horn bracket. The results show that the area with the maximum damage value of 31.356 is consistent with actual fracture site. Adding a piece of stand can improve the fatigue life of bracket. The maximum damage value of the improved bracket is less than 1.000, which can meet the fatigue life requirement. Under the premise of model accuracy, the load spectrums extracted through virtual iteration can be effectively applied into fatigue analysis of vehicle components.
2015, Vol. 36 
