Theoretical analysis on the transmission loss of a micro-perforated tube muffler with gradually changed back cavity

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 189-194.

HOU Jiuxiao1,2，ZHU Haichao1,2，MAO Rongfu1,2

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Abstract

In order to improve the performance of a micro-perforated tube muffler (MPTM), the influence of cavity structure on the transmission loss of the MPTM was discussed.The acoustic transmission model for gradually changed back cavity micro-perforated tube muffler (GCBCMPTM) was established based on the one-dimensional plane wave theory and micro-perforated absorption theory.The transmission loss (TL) of the GCBCMPTM was solved with the transfer-matrix method.The calculated values were compared with the three-dimensional finite element model (FEM) acoustic simulation results.The influence of structure parameters of the back cavity on the TL was analyzed.The results show that minimums of the TL curve appear at the axial acoustic mode frequencies.For conical back cavity, when the taper increases, the absorption bandwidth will be expanded, and the values of minimums at the axial mode frequencies will be raised as well; while, for circular arc back cavity, when the radius of curvature decreases, the absorption bandwidth will be expanded, and the absorption effects in low frequency will be improved as well.

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gradual change back cavity / micro-perforated tube muffler / plane wave theory / transmission loss

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HOU Jiuxiao1,2，ZHU Haichao1,2，MAO Rongfu1,2. Theoretical analysis on the transmission loss of a micro-perforated tube muffler with gradually changed back cavity[J]. Journal of Vibration and Shock, 2019, 38(14): 189-194

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