水下复杂壳体结构在多源激励下的振动及声辐射特性研究

为了综合评估水下复杂壳体结构在多源激励下的振动与声辐射特性,专门设计了一个多舱段复杂壳体模型,分别进行了单台设备激励、多台设备激励的壳体振动与声辐射试验。试验结果表明,多源激励下的结构响应和辐射声场可以近似为单源激励下结构响应和辐射声场的非相干叠加。通过对激励源与结构响应、辐射声场之间传递关系的理论分析,讨论了以单源激励响应非相干叠加合成得到多源激励响应的合理性和误差。研究结果对复杂壳体结构在实际激励下的振动与噪声预报具有重要价值。

Research on vibration and acoustic radiation of the submerged complicated shell structure with multiple excitations

In order to evaluate the structural vibration and the acoustic radiation of underwater complicated shell structure with multiple excitations,a complicated multiple compartment shell structure,similar to real ships,is designed and the underwater vibration and acoustic radiation experiments with single and multiple excitations are implemented. The experimental results show that sound pressure caused by multiple excitations can be approximated as the incoherent superposition of those caused by each excitation separately.The transfer relations between the vibro-acoustical characteristics of the structures and the excitations are deduced analytically.The rationality and the error of the incoherent superposition are analyzed as well.It is indicated the incoherent superposition method can be used to calculate the vibration and sound radiation of the complicated shell structure with multiple excitations,and it has important significance to predict the real vibration response and acoustic field.