基于有限元和边界元理论，建立了仪器舱典型结构的耦合模型，分析了声振耦合对结构响应的影响。当典型结构经受随机振动+混响声场复合环境激励时，采用随机分析的原理，用谱分析的分析方法定性的分析结构的动力响应情况，推导了节点响应谱密度的计算公式，解决了Sysnoise软件同时对声振复合环境进行数值模拟的问题。仿真结果表明：声振耦合影响结构的响应，且在各频率上影响程度不同，在低频时较弱，相当于附加阻尼的效果，随着频率的升高，耦合程度随之加强，改变了结构的响应分布；对声振复合环境数值模拟，在低频部分，随机振动激起的响应占主要部分，随着频率的升高，混响声场激起的响应占主要部分，混响声场激起的模态数也要多于随机振动激起来的。

Based on the coupled finite element and boundary element method, the numerical implementation for computing simultaneously the structural vibration and the associated acoustic field is presented. This paper presents a new approach for integrating discrete structural-acoustic methods with stochastic analysis for computing the vibro-acoustic behavior of the cabin structural subjected to random excitation from a shaker plus reverberant acoustic field. By the mathematical formulation deduced we can calculate nodal response power spectrum density (PSD) of the coupling model under random vibro-acoustic combined environment, it solved the problem that SYSNOISE cannot calculate at the situation when the structure is suffering two different kinds of random excitations simultaneously. The results show that: the effect of structural-acoustic coupling is equivalent to an added damping effect in low frequency, with the increase of frequency, the effect becomes obvious. For the case of vibro-acoustic combined environment, in low frequency, response is mainly caused by random vibration, while in high frequency by reverberant field, modes excited by reverberant field are more than by random vibration, especially in high frequency.