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本文首先从结构振动模态理论的角度，论述了结构振动与声辐射之间的基本耦合关系，提出了结构声辐射模态的有关理论，用结构的声辐射模态参数来表征结构本身的固有声辐射特性。然后将该理论应用于柴油机机体的声辐射特性分析。利用有限元技术，建立了柴油机机体的动力学模型，并经过理论计算得到机体的模态参数。在此基础上，应用文中提出的声辐射模态理论，对机体进行了声辐射模态参数计算，获得了柴油机机体的声辐射特性，从而为机体的低噪声设计提供了依据
In this paper, the fundamental coupling between structure vibration and acoustic radiation is discussed from the perspective of structural vibration mode theory. Relevant theories of structural acoustic radiation modes are put forward. The structure intrinsic parameters of acoustic radiation are used to characterize the intrinsic structure Sound radiation characteristics. Then this theory is applied to the analysis of sound radiation characteristics of diesel engine body. The finite element method is used to establish the dynamic model of diesel engine, and the modal parameters of the engine are obtained through theoretical calculation. On this basis, the acoustic radiation modal theory proposed in this paper is used to calculate the acoustic radiation modal parameters of the airframe, and the sound radiation characteristics of the diesel engine body are obtained, which provides a basis for the low noise design of the airframe