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| Simulation Analysis Method for High Frequency Vibration of Typical Cabin Structures |
| CHEN Yang， JIANG Gang， LIANG Shan， WANG Zhaoxi |
| Shanghai Spaceflight Precision Machinery Institute， Shanghai 201600， China |
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Abstract To solve the problems of mesh dependence and uncertainty sensitivity in the simulation analysis of the high-frequency vibration test, the FE-SEA (finite element statistical energy method) coupling modelling method of cabin structure and the shaking table was proposed. Taking the typical cabin structure of air defencemissiles as a case study,by analyzing the frequency characteristics, the principle and method of subsystem division of cabin structure weredetermined, and the statistical energy analysis model of cabin structure wasestablished in the VA one. The hybrid model method based on wave coupling wasused to analyze the energy transfer relationship between the finite element model and the statistical energy method model. The FE-SEA coupling analysis model of the cabin structure and the shaking table was established, and the random vibration response of the typical cabin structure wassimulated. The random vibration tests of the typical cabin were conducted, and the simulation results of the RMS value of cabin structure velocity and acceleration in respectivefrequency bandswerein agreement with the actual test data. The results show that the FE-SEA analysis method based on wave coupling theory solves the challenges in high-frequency coupling modelling in random vibration simulation analysis, and the simulation prediction accuracy of the high-frequency vibration test reaches ±3 dB。
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Received: 30 November 2022
Published: 06 July 2023
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2023, Vol. 6 
