Experimental Investigation of Aerodynamic Noise Generated by a Train-Car Gap
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概要
- 論文の詳細を見る
To investigate the mechanism of noise generation by a train-car gap, which is one of a major source of noise in Shinkansen trains, experiments were carried out in a wind tunnel using a 1/5-scale model train. We measured velocity profiles of the boundary layer that approaches the gap and confirmed that the boundary layer is turbulent. We also measured the power spectrum of noise and surface pressure fluctuations around the train-car gap. Peak noise and broadband noise were observed. It is found that strong peak noise is generated when the vortex shedding frequency corresponds to the acoustic resonance frequency determined by the geometrical shape of the gap, and that broadband noise is generated at the downstream edge of the gap where vortexes collide. It is estimated that the convection velocity of the vortices in the gap is approximately 45% of the uniform flow velocity.
- 一般社団法人 日本機械学会の論文
著者
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Kato Chisachi
Institute Of Industrial Science The University Of Tokyo
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Iida Akiyoshi
Department Of Mechanical Engineering Kogakuin University
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KURITA Takeshi
Research and Development Center of JR East Group, East Japan Railway Company
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MIZUSHIMA Fumio
Research and Development Center of JR East Group, East Japan Railway Company
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TAKAKURA Hiroyuki
SUGA Test Instruments
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