Study On Random Vibration And Fatigue Of Military Electronic Cabinet

Military electronic cabinet is the vehicular cabinet with electronic component and device in the communication chariot. The mechanical properties will influence the transmission of electrical signal and reliability of electronic system in the field of battlefield. To improve mobility and reliability of communication chariot, optimizing military vehicular electronic cabinet is urgent.Based on the modal analysis theory, the random vibration theory and the random fatigue theory, the dynamic capability of electronic equipment and the fatigue capability of electronic cabinet are investigated by using finite element method. Firstly, the modal analysis of the cabinet show that some natural frequencies are in the frequency range of loads, so the dynamic and fatigue performance of the electronic cabinet must be analyzed. Secondly, it is seen from the results of random vibration analysis that the acceleration root mean square of new electronic cabinet reduced 11.8% than old electronic cabinet. The new electronic cabinet can reduce the dynamic response of electronic equipment and improve the reliability of the communication chariot. Finally, the results of random fatigue show that the fatigue capability of the new electronic cabinet is better than the old electronic cabinet. The earliest crack initiation sites of the two kinds of electronic cabinet will happen in the bottom bridging beam. To further optimize the new electronic cabinet, we may improve the dynamic performance of the bottom bridging beam.