Abstract:

The conical shell, as a typical structural component of spacecraft, may be excited by very strong noise in its operation, which will induce vibration-acoustic coupling of the structures and acoustic radiation. In this paper, the vibration-acoustic coupling models are built based on the FEM for the tructure and the BEM for the sound field. Numerical simulation of these models is carried out using Acoustic BEM Module in LMS virtual.lab code. The simulation results are verified with those of the noise test in the reverberation chamber. On this base the vibration-acoustic coupling characteristics of the conical shell is analyzed, and the structural responses of the coupled model are compared with those of the uncoupled model of the structure. The results demonstrate that the existence of acoustic fields influences the amplitudes and istributions of the structural responses, and the degrees of vibration-acoustic coupling exhibit different characteristics at different frequencies.

Key words: vibration and wave, FEM/BEM, conical shell, vibration-acoustic coupling

摘要：

通过利用LMS virtual.lab中的Acoustic BEM模块实现了FE/BE 声振耦合模型的仿真计算，且计算结果通过了混响噪声实验验证。在此基础之上，分析圆锥壳结构的声振耦合特性，并与不考虑声场的结构响应的情况进行了比较分析。结果表明声场的存在影响结构的响应幅值与分布，且耦合程度在不同频率下表现出不同特性。

关键词: 振动与波, 边界元/有限元, 圆锥壳, 声振耦合