Abstract: To study the problem of noise radiation penetrating ship’s hull plate, a hybrid method for analyzing medium-frequency vibration of a model structure was established. Statistical energy analysis and finite element method based on wave propagation theory were applied. The reciprocity principle for diffusion field of multi-degree of freedom was subsequently employed to yield a new method which realized the coupling calculation between deterministic components and statistical components. Then the vibration-acoustic response of the model structure was obtained. Transmission loss of the plate structure was calculated. Through the comparison with the results from traditional SEA method and mass law curve, the effectiveness and accuracy of the current method was validated.

Key words: acoustics, transmission loss, deterministic method, statistical energy method, hybrid method, plate

摘要： 为了研究透过船舶外板的噪声辐射问题，基于波动理论、统计能量法和有限元方法，建立了中频声振模型结构的混合分析模型，采用扩散场多自由度互易原理，进而实现随机子系统和确定子系统的耦合计算，给出模型结构在外界激励下的声振响应。通过数值计算板结构的传递损失，与传统的SEA比较，验证方法的可行性、有效性，证明该方法计算复杂结构的高效性与精确性，可以应用于实际工程问题。

关键词: 声学, 隔声量, 确定性方法, 统计能量法, 混合方法, 板