nalysis of Low frequency Noise Emitted from High-speed Train with Fluid Model

高速列车低频噪声的流体模型分析

基本信息

批准号：
11650543
负责人：
YAMADA Shinji
金额：
$ 2.05万
依托单位：
Yamanashi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650543/
关键词：
Hgh-speed train Low frequency noise Yamanashi maglev test line Tunnel entrance hood Potential flow model トンネル

项目摘要

A low frequency noise emitted from a high-speed train was measured at the Yamanashi maglev test line. Sound attenuation with distance, increase of sound level with train speed and influences of a tunnel entrance (hood) on low frequency noise were investigated.Experiments on low frequency noise generation with a 1/100 high-speed train model at a laboratory were carried out. Sound attenuation with distance, and increase of sound level with train speed were measured. These characteristics are accorded to the measurements of the Yamanashi maglev test line.It was shown that a numerical analysis of the low frequency noise generated by a high-speed train was done with a potential flow model around a high-speed train. The increase of sound level with train speed can be explained mathematically from the fluid model. The sound attenuation with distance, the sound level with train length and the frequency characteristics with distance are explained by numerical simulation.It was shown that a nume … More rical analysis of the low frequency noise generated by a high-speed train was done with a potential flow model around a high-speed train. The increase of sound level with train speed can be explained mathematically from the fluid model. The sound attenuation with distance, the sound level with train length and the frequency characteristics with distance are explained by numerical simulation.It was shown that a numerical analysis of the low frequency noise generated by a high-speed train was done with a potential flow model around a high-speed train. The increase of sound level with train speed can be explained mathematically from the fluid model. The sound attenuation with distance, the sound level with train length and the frequency characteristics with distance are explained by numerical simulation.The influence of a tunnel entrance on the low frequency noise was examined with the model train experimental equipment. A tunnel entrance increases the level of low frequency noise around the tunnel entrance.The level of low frequency noise generated bye the high-speed train can be predicted with these results Less

在山梨县磁悬浮试验线测量了高速列车发出的低频噪声，研究了声音随距离的衰减、声级随列车速度的增加以及隧道入口（罩）对低频噪声的影响。在实验室中用 1/100 高速列车模型进行了低频噪声生成，测量了声音随距离的衰减以及声级随列车速度的增加，这些特性与山梨磁悬浮试验的测量结果一致。结果表明，利用高速列车周围的势流模型对高速列车产生的低频噪声进行了数值分析，声级随列车速度的增加可以从流体中进行数学解释。通过数值模拟解释了声衰减随距离的变化、声级随列车长度的变化以及频率特性随距离的变化。结果表明，对高速列车产生的低频噪声进行了一些逻辑分析。高速列车周围的势流模型。声级随列车速度的增加可以从流体模型中进行数学解释，通过数值模拟解释声级随距离的衰减、声级随列车长度的变化以及频率随距离的变化。高速列车产生的频率噪声是通过高速列车周围的势流模型来计算的，声级随列车速度的增加可以用流体模型来解释。列车长度和频率随距离的特性用数值解释利用模型列车实验设备研究了隧道入口对低频噪声的影响。隧道入口增加了隧道入口周围的低频噪声水平。高速列车产生的低频噪声水平。可以用这些结果进行预测 Less