| Citation: | PENG Tao, HOU Feng, ZOU Xuefeng, et al. Sound insulation performance of laminates based on the equivalent method and FE-BEM[J]. Journal of Aerospace Power, 2024, 39（2）：20230191 doi: 10.13224/j.cnki.jasp.20230191
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The sound insulation performance of symmetric laminate structure was estimated and verified by experiments. Based on the classical laminate theory, the symmetric laminate structure was equivalent to a single anisotropic plate, and its sound insulation characteristics under broadband noise excitation were analyzed by the FE-BEM （hybrid finite element-boundary element method）. In order to verify the applicability of the equivalent method, modal experiments and numerical analyses of symmetric composite laminates were carried out. To verify the correctness of the predicted conclusions, FE-BEM results were compared with FE-SEA （hybrid finite element-statistic energy analysis） results and experimental results. The results showed that the equivalent method can correctly simulate the natural characteristics of symmetrical laminates, the simulation results were consistent with the experimental results and the corresponding error was 6.9%. The equivalent method combined with the FE-BEM was effective for sound insulation prediction of symmetric laminates, and the predicted results of the FE-BEM agreed well with the experimental results. The equivalent method combined with the FE-SEA method was effective for sound insulation prediction of symmetric laminates, the calculation time of FE-BEM model was more than FE-SEA model, and the calculation time increased by 4.4%.
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