Fatigue life prediction of vehicle components by power spectrum method

The fatigue life prediction of vehicle components is a key problem of the fatigue resistance design. A fatigue life prediction method - the power spectrum method was discussed in this paper. This method can be used at the beginning of design because it doesn't need to make test samples and to do many experiments like a traditional notation method does. We established a dynamic model of the suspending system with the torsion bar spring. The correlation formula describing the fatigue life of torsion bar spring and the parameters of suspending system was developed through the fatigue life prediction method and the system model, which is very important for the optimization and sensitivity analysis of the suspending system.