基于二维等效FE-SEA混合方法的复合材料层合板传声损失分析

为研究湍流脉动噪声激励下复合材料层合板的传声特性,首先基于一般层合板理论将复合材料层合板等效为单层各向异性板,进而采用FE-SEA混合方法研究其传声损失。同时开展复合材料层合板传声损失试验,并将FE-SEA结果和统计能量法(SEA)结果以及实验值进行对比分析。研究结果表明:FE-SEA结果和实验值整体上分布趋势一致,而且误差也相对较小,其中3 000 Hz～10 000 Hz误差在2 dB以内,但由于刚度等效导致2 000 Hz附近结果误差相对较大。相较于SEA方法, FE-SEA混合方法综合考虑了复合材料层合板边界条件和详细得几何特征,不仅可以准确地计算复合材料层合板的固有特性,而且使得传声损失结果在全频带内与试验值吻合得更好。因此建立的二维等效FE-SEA混合模型可以准确预示复合材料层合板在湍流脉动噪声激励下的传声损失。

Transmission loss analysis for composite laminates based on two-dimensional equivalent hybrid FE-SEA method

In order to study the transmission loss of composite laminates under turbulent pulsating noise excitation. Firstly, the composite laminates are equivalent to a single-layer isotropic panel based on general laminate theory, and the hybrid FE-SEA method is used to research the transmission loss of composite laminates. At the same time, the transmission loss experiment is carried out, and the results of hybrid FE-SEA method are compared with SEA and experimental results. The results showed that the hybrid FE-SEA results are consistent with the distribution trend of experimental results and the error is relatively small. The error of 3000Hz~10000Hz is within 2dB, but the equivalent of stiffness leads to a relatively large error around 2000Hz. Compared with the SEA method, the hybrid FE-SEA method comprehensively considers the boundary conditions and the detailed geometric features of the composite laminates. It can not only accurately calculate the inherent characteristics of the composite laminates, but also make the results of transmission loss well consistent with the experimental values in the whole frequency band. Therefore, the two-dimensional equivalent FE-SEA hybrid model established in this paper can accurately predict the transmission loss of composite laminates under turbulent pulsating noise excitation.