Vibration and Fatigue Analyisis of a Plugged-in Electronic Device Box

Method of vibration test is usually used in engineering practice to verify the vibration tolerance of products.It is a problem to know the residual fatigue life of the products that passed the vibration test.In this paper,the stress vibration response of a plugged-in electronic device box was found by modes analysis.According to the stress history,the residual fatigue life of the box was computed.The main steps are as follows.First,solve the normal modes of the system by matrix iteration.Second,solve the elements stress response under the sine wave sweeping and random exciting.Finally compute the fatigue damage of the elements according to Miner′s Rule.