多段共鳴器による空調ダクト用消音器 : 2段及び3段共鳴器の音響特性 その1

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タイトル別名
  • APPLICATION OF MULTIPLE-SECTION RESONATORS TO AIR-CONDITIONING DUCTS : Acoustic properties of double and triple section resonators Part 1
  • 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 2ダン オヨビ 3ダン キョウメイキ ノ オンキョウ トクセイ ソノ 1

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説明

We have examined how to compose multiple-section resonators to attenuate air-conditioning duct noise. Regarding characteristics of resonance frequency the maximum transmission loss was produced when the resonators had a space of one-fourth of the resonance wavelength. Regarding double-section resonators the equal value of the absorption loss to the transmission loss was obtained by making normalized acoustic resistance of the up-stream resonator "R+1" against "R" of the down-stream resonator. And we stated possibility of applying to air-conditioning ducts by comparing the frequency characteristics of multiple-section resonators.

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