Fatigue life analysis of the plate structure with random vibro-acoustic loading

摘要

Vibro-acoustic loading is one of the random loadings, which acts on the structure surface. The vibro-acoustic load will excite the random vibration response of the structure, which will lead to fatigue failure. In this investigation, the random response and fatigue failure of the typical plate structure with random vibration loading is derived. The transformation relation between acoustic loading and random vibration loading is presented. The acoustic loading is simulated with random vibration environment. Then the power spectrum density of the acceleration is treated as the loading condition. The random vibration response of typical plate structure is calculated with numerical method. Based on the calculated results of the random stress and fatigue analysis method, the evaluation of fatigue life for the structure is carried out and compared with the criterion life to demonstrate the reliability of the current method.