Numerical and experimental research on road traffic noise propagation for various type of road structure and development of environmental noise prediction method

虽然道路交通对我们的社会是不可或缺的，因为它支持了工业基础，但它也引起了严重的问题，如噪音或空气污染，它威胁着我们的生活。特别是在交通量巨大的东京及其近郊地区，这一问题更为严重，城市设计迫切需要精确的噪声环境预测方法。为了解决这一噪声问题，本研究采用数值分析和缩尺模型试验相结合的方法，对城市道路结构特殊部位的噪声传播机理进行了分析，并取得了以下研究成果。[1]各类隔音屏障及隔音设施的消声效果研究近年来，不同类型的隔音屏障已发展及应用于噪音问题严重的地区。然而，噪声预测方法还没有得到充分的研究，其设计程序也没有建立起来。 关于我们 H.本研究对此类声屏障和声屏障进行了数值分析和实验检测，获得了可有效应用于噪声预测模型的基本定量数据和知识。[2]基于波动理论的数值分析方法的适用性基于波动理论的数值分析技术是预测几何复杂地区噪声环境不可缺少的手段。在本研究中，定量地检验了二维数值分析对三维真实的环境的适用性。关于声屏障的插入损失，澄清了各种声源条件下二维数值分析与三维实验值之间的定量差异。[3]半地下道路环境噪声预测中的声源模型研究为了建立半地下道路环境噪声预测方法，本文提出了声源模型的新概念，并通过二维数值分析和三维模型试验验证了声源模型的适用性。此外，为了掌握半地下道路的噪声辐射特性，进行了现场测试。少

Though the road traffic is indispensable to our society because it supports the industrial basis, it also causes the serious problems such as the noise or air pollution and it threats our life. Especially, in Tokyo and its suburban areas which have enormous traffic volume, the problem is more serious and precise prediction method of noise environment is strongly required for the urban design. In order to deal with such a noise problem, noise propagation mechanism in the special parts of road structures which is peculiar to urban areas have been analyzed by both of numerical analysis and scale model experiments in this research and the following outcomes have been obtained.[1] Study on sound attenuation effect of various type of noise barriers and embankmentRecently, various types of noise barriers have been developed and adopted on the areas where noise problem is serious. However, the noise prediction method has not been fully examined and its design procedure is not established enoug … More h. In this study, numerical analysis and experimental examination on such types of noise barriers and embankments were performed and the basic quantitative data and knowledge which are effectively applied for making the noise prediction model have been obtained.[2] Applicability of numerical method based on wave theoryNumerical analysis technique based on the wave theory is indispensable for predicting noise environments in the area with geometrical complex. In this research, the applicability of the 2-D numerical analysis to 3-D real environment are quantitatively examined. On the insertion loss of the noise barriers, quantitative difference between 2-D numerical analysis and 3-D experimental values for various sound source conditions have been clarified.[3] Sound source modeling for environmental noise prediction around semi-underground roadsIn order to establish noise prediction method for semi-underground roads, the new concept for sound source model have been proposed in this research and its applicability has been examined by 2-D numerical analysis and 3-D scale model experiments. Furthermore, in order to grasp the noise radiation characteristics from semi-under ground road, an in-situ measurement has been conducted. Less