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概要:
道路用防音壁の頂部に設置する笠木を兼用する独自の吸音装置を開発した。本開発品は，吸音材料を使用せず，アルミニウム製の共振周波数の異なる筒状共鳴室を4室設けることで音の干渉現象を利用し，幅広い周波数帯で大きな騒音低減効果が得られる商品である。加工性，施工性，経済性に優れ，しかも従来品の1/2程度に小型化され，橋梁部，高架部などのあらゆる道路建築限界に対応可能である。
Abstract:
We have developed an original absorptive equipment set on the top of a noise barrier, which decorates the top of it. This developed product uses no absorptive material. It has four tubular resonant rooms made of aluminum, which has various resonance frequencies, and due to the interference phenomenon, it is able to attain a high noise reduction effect at a wide frequency band. It has an easy fabrication, a simple installation, a high cost performance. It is miniaturized as 1/2 as existing products and therefore it can deal with all road limitations of a bridge and elevated part.
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Keywords:
防音壁, 吸音笠木, 共振周波数, 筒状共鳴室, 干渉現象, 道路建築限界, フィールド音響試験, 排水性舗装
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