2001 Fiscal Year Final Research Report Summary
nalysis of Low frequency Noise Emitted from High-speed Train with Fluid Model
| Project/Area Number |
11650543
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
交通工学・国土計画
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| Research Institution | Yamanashi University |
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Principal Investigator |
YAMADA Shinji Yamanashi University Faculty of Engineering, Professor, 工学部, 教授 (90020403)
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| Co-Investigator(Kenkyū-buntansha) |
KITAMURA Toshiya Yamanashi University Faculty of Engineering, Assistant Professor, 工学部, 助手 (80224971)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Hgh-speed train / Low frequency noise / Yamanashi maglev test line / Tunnel entrance hood / Potential flow model |
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| Research Abstract |
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
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