Efficiency of edge-modified noise barriers: Intrinsic efficiency determination of practical products and prediction of the diffracted sound field

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概要

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• In this paper, the noise shielding efficiency of barriers with an acoustic device mounted on their top edge for reducing sound diffraction is described. The authors have already found that the intrinsic efficiency of the device, which is related to the noise-reducing mechanisms, is a function of the angles of the source and receiver but independent of their radii. In the present paper, a novel procedure based on the previous finding is applied to determine the acoustical efficiencies of practical edge-modifying products in the near field, and the results are utilized in calculations to predict sound diffraction behind the edge-modified barriers in the far field. It is proved that the novel method provides an accurate prediction.

• 社団法人 日本音響学会の論文

著者

• Okubo Tomonao

  Kobayasi Inst. Of Physical Res.

• Yamamoto Kohei

  Kobayasi Institute of Physical Research

• Matsumoto Toshio

  Kobayasi Institute of Physical Research

• Funahashi Osamu

  Nippon Expressway Research Institute Co. Ltd.

• Nakasaki Kunio

  Nippon Expressway Research Institute Co. Ltd.

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• Efficiency of edge-modified noise barriers: Intrinsic efficiency determination of practical products and prediction of the diffracted sound field
• Inaccuracy due to local-reaction model in numerical analyses of noise-shielding efficiency of barriers with absorbing edge
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