Analysis on the Factors Influencing Structural Transfer Characteristic of Torpedo Vibration Test System

The transfer characteristic of the torpedo vibration test system is crucial to the confidence level of vibration environment simulation. Therefore, constructing a test system that can accurately transmit vibration test conditions is the basis for conducting test and simulation of structural transfer characteristic. In this paper, based on different boundary conditions, finite element simulation analysis of transfer characteristic of system under random load excitation is carried out for the cabin vibration test system, and the factors influencing structural transfer characteristic of the test system are determined. Conclusions are drawn as follows: 1) bolt preload, clamp support spacing, and intermediate layer material’s properties are the main factors affecting the transfer characteristic of the system; 2) within a certain range, as the bolt preload increases, the transfer characteristic of the system tends to increase, but when the tightening torque is greater than 40 N·m, the transfer characteristic tends to be stable; 3) the torpedo cabin with a slenderness ratio of 2 to 4 has better system transfer characteristic when the support ratio is from 50% to 66.67%; and 4) when the intermediate layer uses a material with small thickness, large friction coefficient and relatively large damping ratio, the system can achieve higher resonance frequency and better transfer characteristic.