Estimation and experiment for sound absorption coefficient of three clearance types using a bundle of nested tubes
Estimation and experiment for sound absorption coefficient of three clearance types using a bundle of nested tubes
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DOI：
10.1121/1.5063348
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发表时间：
2018-10-01
影响因子：
2.4
通讯作者：
Ii, Kohei
中科院分区：
文献类型：
--
作者：
Sakamoto, Shuichi;Tanikawa, Hirohiko;Ii, Kohei
紧密排列的嵌套结构圆管形成三种类型的间隙：圆形间隙、同心间隙和纵向间隙。包括上述三种间隙的稻草截面形状与本研究样品相似。本文将三个圆柱面包围的圆形、同心圆和纵向间隙的传播常数和特性阻抗视为传递矩阵。然后，将这些传递矩阵并联连接，确定积分这些间隙的传递矩阵，并计算吸声系数。还创建了具有三种类型间隙的测试样品，并测量其吸声系数。同心和圆间隙的贡献是显著的，因为所使用的管的尺寸。计算结果表明，在较宽的频率范围内，偏心距对吸声系数没有显著影响。考虑挠曲的计算结果表明，理论值在低频范围内与实测值接近。(C) 2018年美国声学学会。
Closely packed nested structure circular tubes form three types of clearances: circular clearances, concentric clearances, and longitudinal clearances. The cross-sectional shape of rice straw, including the above-mentioned three types of clearances, is similar to that of the samples of the present study. Herein, the propagation constant and characteristic impedance of the circular, concentric, and longitudinal clearances surrounded by three cylindrical surfaces are treated as a transfer matrix. Then, by connecting these transfer matrices in parallel, a transfer matrix integrating these clearances is determined, and the sound absorption coefficient is calculated. Test samples that have three types of clearances are also created, and measure their sound absorption coefficients. The contributions of the concentric and circular clearances are significant because of the dimensions of the used tubes. The results of the calculations that took eccentricity into account revealed no significant impact on the sound absorption coefficient in wide-frequency range. The results of the calculations that took flexure into account revealed that the theoretical value was close to the measured value in the low-frequency range. (C) 2018 Acoustical Society of America.