基于不相干平面波叠加以模拟混响声场的航天器低频声固耦合分析

摘要

文章针对航天器在混响声场中的随机振动问题，提出一种通过多个不相干的平面波线性叠加以模拟混响声场的实现方法，给出了每个平面波的具体参数并从理论上证明其满足理想混响声场假设。在此基础上利用有限元-边界元耦合方法对整星低频声固耦合问题进行分析，并用混响室噪声试验响应数据进行了验证。研究结果表明：该方法理论推导正确，为航天器低频声固耦合分析及声振力学环境预示提供了一种新的有效手段。%The vibro-acoustic analysis is one of the important parts in the spacecraft design. This paper proposes a method to model the acoustic diffusion field by combining uncorrelated plane waves linearly and its justification is shown theoretically. The parameters for each plane wave are also obtained in the paper. After that, a satellite vibro-acoustic problem is simulated using the FEM-BEM method and the results are validated by the test data, which shows that the method is theoretically correct and could be used to analyze the vibro-acoustic response of spacecraft.