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中文摘要：
针对椭球形空腔吸声覆盖层低频吸声性能比较差的问题，建立了多层材料椭球形空腔结构覆盖层的Comsol有限元模型，采用传递矩阵法验证有限元模型并对其进行吸声特性数值仿真分析。结果表明：理论计算与数值仿真的曲线趋势大致吻合，证明该有限元模型是有效的；相同穿孔率下多层材料吸声覆盖层低频吸声特性明显优于单层材料吸声覆盖层，并且根据穿孔率、表层厚度、损耗因子、杨氏模量等参数的变化分析了各种参数对吸声系数曲线的影响，为下一步声学优化提供具体指导。
英文摘要：
Since the poor absorption property of an ellipsoid cavity absorption coating in low frequency range, the Comsol finite element model of a multi- layered ellipsoid cavity absorption coating is built. The finite element model is verified by the transfer matrix method and its absorption characteristics are simulated. It is indicated that the curves of the theoretical calculation results from the transfer matrix method and the numerical simulation results are roughly in agreement,so the finite element model is validated. The finite element analysis shows that the absorption characteristics of the multilayer material structure are superior to the monolayer material structure in the same perforation rate. Besides, influences of perforation rate, coating thickness, loss factors and Young’s modulus on the absorption coefficients of the structure are analyzed. This work provides a reference for further acoustic optimization of the structure.
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