Construction Method for Reducing Structure Borne Noise in Low-frequency Regions. Part 2. A Study of the Reduction Method Using Anti-phase Sound Waves Generated by a Resonator

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  • 低周波領域の高架構造物音波低減工法　その2．共鳴器による位相反転機構を利用した低減対策方法の検討
  • テイシュウハ リョウイキ ノ コウカ コウゾウブツ オンパ テイゲン コウホウ(ソノ 2)キョウメイキ ニ ヨル イソウ ハンテン キコウ オ リヨウ シタ テイゲン タイサク ホウホウ ノ ケントウ

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Abstract

<p>This study aims to develop a construction method for reducing structure borne noise in low frequency noise regions that is generated from an elevated bridge. In a previous study, a construction method for using an additional vibrating body that emits anti-phase sound waves of the structure noise using a mechanical method was studied. Herein, a construction method where a phase inversion unit is substituted with a resonance phenomenon is studied. Consequently, this construction method can reduce the emitted sound by ≥10dB. The proposed construction method uses a novel reduction mechanism that emits anti-phase sound waves instead of the widely used sound absorption mechanism using a resonance phenomenon.</p>

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