Experiment and Finite Element Analysis of Stochastic Vibration of Severe Environment Computer

The stochastic vibration Experiment is the basic requirement in the reinforcement of the severe computer resistance test. In this paper, the finite element model of the computer is established and the validity of the model is verified by free modal analysis. The modal solution, stress distribution and acceleration power spectral density (PSD) are obtained by modal analysis and stochastic dynamics analysis of the finite element model. The acceleration response of the structure is obtained by stochastic vibration experiment, and the acceleration PSD curve of the structure is obtained by Fourier transform. By comparison, it is found that the error of resonant frequency at the corresponding point obtained by simulation and experiment is less than 10%, and the accuracy is reasonable. Dynamic simulation based on stochastic vibration experiment can shorten the development period of the product and play an important role in product optimization and fault diagnosis.