结构声辐射模态分析

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。推证了振动结构声幅射模态参数：声辐射模态频率，声辐射模态振型，模态辐射声功率以及模态声辐射系数的表达式；讨论了结构的物理声辐射量（辐射声压，辐射声功率和声辐射系数）与结构的声辐射模态参数之间的关系，指出结构的声辐射模态可用来表征结构本身的固有声辐射特性。并将该理论应用于柴油机缸体的声幅射模态特性计算。

Acoustic radiation modal analysis of vibration structures

The theory on structure acoustic radiation mode,which is concerned with the fundemental relation between structural vibration and acoustic radiation,is developed in this paper.Acoustic radiation modal parameters of vibrational structures (acoustic radiation mode frequency,acoustic radiation mode shape,modal radiation acoustic power and mode acoustic radiation coefficients) are derived,and the ralation between physical acoustic radiation quantity and structural acoustic radiation modal parameters is also discussed in the paper.Through the presented discussion,it is pointed out that the structural acoustic radiation modes can be used to characterize and study the inherent acoustic radiation properties of structures.