Random vibration fatigue simulation of vehicle contamination box based on information in frequency domain

Take the vehicle contamination box for example,this paper introduces the theory and realization process of random vibration fatigue analysis based on frequency domain method in detail.That is,calculating the frequency response of the structure to obtain the transfer function at first,then multipling this transfer function with the power spectrum to obtain the stress power spectral density of the structure,combing which with the material parameters,and selecting the appropriate damage model,it is able to figure out the fatigue life of the structure through frequency domain method.This method provides technical support for the fatigue design of vehicle equipment.As the analysis process of frequency domain method is concise,and no need of cycle count,this method is valuable for engineering utility,and thought much of.