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Development of energy-based calculation methods of noise radiation from semi-underground road using a numerical analysis

机译：基于数值分析的半地下道路噪声辐射能量计算方法的发展

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References(6) Cited-By(1) As a calculation method of road traffic noise at the roadside area of a semi-underground road, the “hypothetical point source method” was proposed in the road traffic noise prediction model “ASJ RTN-Model” proposed by the Acoustical Society of Japan. In this method, noise radiation from a straight semi-underground road is simply modeled as sound propagation from a hypothetical point source that has a directivity specific to the dimensions of the structure and is assumed to be at the center of the mouth. In the ASJ RTN-Model 2003, the directivity characteristics were determined on the basis of the results of a scale model experiment, and the variation of the applicable dimensions of the road structures was limited. In this paper, the directivity characteristics of the hypothetical point source are examined by wave-based numerical analysis to extend the variation. In the numerical analysis, a Fourier-type transformation technique from a two-dimensional field to a three-dimensional field is applied to the calculation results obtained by the two-dimensional finite-difference time-domain method. In addition, the practical expression of the sound power of the hypothetical sound source is investigated.
机译：参考文献（6）引用（1）作为半地下道路路边区域道路交通噪声的一种计算方法，在道路交通噪声预测模型“ ASJ RTN-Model”中提出了“假想点源法”由日本声学学会提出。在这种方法中，来自一条直的半地下道路的噪声辐射被简单地建模为来自一个假设点源的声音传播，该点源具有特定于该结构尺寸的方向性并且被假定为位于嘴的中心。在ASJ RTN-Model 2003中，根据比例模型实验的结果确定了方向性特征，并且限制了道路结构的适用尺寸的变化。在本文中，通过基于波的数值分析来检查假设点源的方向性特征以扩展变化。在数值分析中，将从二维场到三维场的傅立叶型变换技术应用于通过二维有限差分时域方法获得的计算结果。另外，研究了假设声源的声功率的实际表达。

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