Acoustic Characteristics of a Side Branch Silencer with the Finite Impedance at the End
Acoustic Characteristics of a Side Branch Silencer with the Finite Impedance at the End
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末端有限阻抗侧支消声器的声学特性
DOI：
10.1299/jee.5.456
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
K. Ishihara
中科院分区：
文献类型：
--
作者：
M. Tsuji;K. Ishihara
为了提高侧分支消声器的适用性，通过实验获得了端部阻抗有限的侧分支的声学特性。其结果是，可以根据侧分支的长度和侧分支的端部的固有频率来确定降噪（NR）的峰值频率。实验结果与考虑圆膜理论阻抗的有限元分析和传递矩阵法理论计算结果吻合较好。此外，已经理解，在该侧分支中NR的峰值频率对应于一个开口端和具有阻抗的另一端的简单管的固有频率。此外，可以理解的是，计算简单管的固有频率对于预测NR变为最大的频率是有效的。
To improve the applicability of the side branch silencer, the acoustic characteristics of the side branch with a finite impedance at the end was obtained by the experiment. As a result, it was clarified that the peak frequency of the noise reduction (NR) could be decided from the side branch length and the natural frequency of the end of a side branch. Moreover, the experimental result is in good agreement with the analysis of FEM considering the theoretical impedance of the circular membrane and the theoretical calculation by the transfer matrix method. In addition, it has been understood that the peak frequency of NR in this side branch corresponds to the natural frequency of a simple tube of the one open end and the other end with an impedance. Additionally, it was understood that the calculation of the natural frequency of the simple tube is effective for the prediction of the frequency at which NR becomes maximum.