In order to study the response of shipboard equipment under different shock environment and the impact of exciting frequency on equipment, the response of different types and weights of equipment were analyzed by numerical simulation and theoretical analysis. The force model of shipboard equipment under impact load was simplified as the multi-degree of freedom system with base excitation. Through the modal method of virtual constraint boundary, a calculation method for the response of multi-degree of freedom system under different shock environment was established. The impact of exciting frequency on equipment response was studied by analyzing the frequency response function of the system. The results show that spectrum displacement and spectrum velocity have significant effect on equipment response, but the significant changes in spectrum acceleration has little influence on the equipment response. The impact of exciting force on equipment response is negligible when the exciting frequency is greater than twice the frequency of modal truncation. The results can provide references for response analysis of shipboard equipment under impact load and the impact resistant ability evaluation of equipment.
Key words
underwater explosion /
shock environment /
shipboard equipment /
virtual constraint boundary /
response analysis
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