防音壁の遮音性能の違いを考慮した騒音低減評価手法

DOI Web Site 参考文献3件
  • 佐藤 大悟
    公益財団法人鉄道総合技術研究所 九州大学 芸術工学府
  • 尾本 章
    九州大学 芸術工学研究院

書誌事項

タイトル別名
  • Noise prediction considering transmitted sound from noise barriers

抄録

<p>In the noise prediction on railway viaducts by numerical acoustic analysis, it is premised that the noise barriers have sufficient sound insulation performance. Considering that the sound transmission loss of the noise barrier has frequency characteristics, which are different for each noise barrier, it is desirable to take the sound insulation performance into consideration to avoid the overestimation of noise reduction effect. In this study, the sound insulation performance of the noise barrier is regarded as a sound damping component by set the different medium domain from the air domain in the analysis. The sound damping characteristics are represented by the complex wave number, which is set as the sound attenuation per unit length related with the transmission loss and the thickness of the noise barrier. As a result, it was confirmed that the sound attenuation corresponding to the transmission loss of the noise barrier can be set appropriately for the plane wave propagating model with consideration of the sound reflection caused by impedance discontinuity. In addition, FEM analyses were conducted for the railway viaduct assuming that the additional noise barrier made of the polycarbonate plate was installed. Consequently, it is concluded that the differences due to the transmission loss can be sufficiently evaluated because the distribution of sound pressure level outside the viaduct shows the influence of the transmitted sound from the additional noise barrier.</p>

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