Calculation of Required number of punched hole in resonator type muffler

Calculation of Required number of punched hole in resonator type muffler

1Inside diameter of duct：D(mm)0＜D
2Octave band center frequency：fr(Hz)=Resonant frequency. 0＜fr.
3Target attenuation value：R(dB)0＜R
4Diameter of punched hole：d(mm)0＜d
5Thickness of duct：l(mm)0＜l
6Sound velocity：v(m/s)0＜v
7GraphPlot Input Data：
8Number of gridlines of Graph x-axis, y-axis Figure：
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Keyword･Reference･Remarks･History

LaTex

Keyword

Required number of punched hole,resonator type muffler,Inside diameter of duct,Octave band center frequency,Resonant frequency,Target attenuation value,Diameter of punched hole,Thickness of duct,Sound velocity

Reference

[1]：前川純一：『建築・環境音響学』,共立出版,1990,pp.121-127.

Remarks

・Conductivity of one hole：G(mm)
・Area of one hole：s(mm^2)
・Volume of airtight hollow：V(mm^3)
・Required number of punched hole：N
・Cross section of duct：S(mm^2)
・Wavelength of resonant frequency：λr(mm)=v/fr*1000
・Making Equation Image is powered by CODECOGS

History

・2011/01/29：Upload

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