Sakamoto Shuichi, Maruyama Yuki, Yamaguchi Kohei, Ii Kohei
Faculty of Engineering, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181, Japan.
Graduate School of Science and Technology, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata, 950-2181, Japan.
J Acoust Soc Am. 2019 Feb;145(2):724. doi: 10.1121/1.5089427.
The sound absorption coefficient of thin tubes with a honeycomb-corrugated structure was estimated via theoretical analysis assuming the dimensions of the tube and the known physical properties of air. This analysis yields a propagation constant and characteristic impedance, which can be modeled as a one-dimensional transfer matrix. The sound absorption coefficient is then calculated by the transfer-matrix method and the results of comparison with the experiments are reported. The corrugated clearance was divided into elements for which approximations that assumed the clearance between two planes and took into account the perimeter and cross-sectional area of each element were considered. The theoretical value of the sound absorption coefficient obtained using this method was shown to be in good agreement with the experimental results. The experimental value of the sound absorption coefficient was larger than the theoretical value in the previous method in the analysis wherein each divided element was approximated by the distance between two planes taking into account the thickness and cross-sectional area of the clearance.
通过假设管道尺寸和已知空气物理特性进行理论分析，估算了具有蜂窝状波纹结构的细管的吸声系数。该分析得出一个传播常数和特性阻抗，它们可以被建模为一维传递矩阵。然后通过传递矩阵法计算吸声系数，并报告与实验的比较结果。波纹间隙被划分为多个单元，对于这些单元，考虑了假设两个平面之间的间隙并考虑每个单元的周长和横截面积的近似值。结果表明，使用该方法获得的吸声系数理论值与实验结果吻合良好。在分析中，将每个划分单元近似为考虑间隙厚度和横截面积的两个平面之间的距离时，前一种方法的吸声系数实验值大于理论值。
