基于传递矩阵法的多层吸声材料参数计算——吸声系数
Journal: Engineering Technology Development DOI: 10.12238/etd.v3i4.5264
Abstract
多孔介质具有良好的吸声性能，是重要的吸声材料。吸声材料的吸声系数是评判其性能的重要指标。理论模拟以获取吸声系数是选取合适的吸声材料的重要手段。传递矩阵法是求解多层介质中的声波特性和介质参数的有效方法。在之前的工作中，我们已经简单介绍了全局传递矩阵的组装方法以及边界条件的应用，并以此为依据计算了多层吸声材料的阻抗系数。在本文中，我们仍然从传递矩阵理论出发，求解吸声材料重要的参数：吸声系数。首先给出基于传递矩阵法求解吸声系数的过程。然后选取几种典型的材料，针对不同问题，分别求解其吸声系数。除此之外还将对孔隙度和材料构成等对材料属性的影响进行考察。
Keywords
多孔材料；传递矩阵法；吸声系数
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[5] Allard, J. F., Propagation of Sound in Porous Media, Elsevier Applied Science, 1993.
[6] Atalla N., Panneton R., “The mixed displacement-pressure formulation for porous-elastic materials and particular cases,” GAUS report, Univ. de Sherbrooke (1999).
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