APPLICATION OF MULTIPLE-SECTION RESONATORS TO AIR-CONDITIONING DUCTS : Double section resonators by the different resistance Part 2

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  • 多段共鳴器による空調ダクト用消音器 : 異種2段共鳴器による消音器 その2
  • タダン キョウメイキ ニ ヨル クウチョウ ダクトヨウ ショウオンキ イシュ 2ダン キョウメイキ ニ ヨル ショウオンキ ソノ 2

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When the resonators have a space of one-fourth of resonance wavelength, the transmission loss of double section resonators becomes the maximum. In addition, when the acoustic resistance of the upstream resonator is adjusted to the specific value for the acoustic resistance of the downstream resonator, the acoustic dissipation increases. This paper shows the example of applying such double section resonators to the silencer for the air-conditioning duct. First, the acoustic impedance of the resonator which installed resistance to the resonance pore is discussed. Next, the measurement result of the peculiar acoustic properties and dynamic insertion loss of the double section resonators which composed with these resonators is shown.

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