2018 年 59 巻 2 号 p. 109-114
Aerodynamic and bridge noise originate from pressure fluctuations generated by high-speed trains in open sections without tunnels. In this study, field tests using a linear microphone array were conducted in order to clarify low-frequency aerodynamic sources of noise below 100 Hz. In addition, a scale-model experiment using a launching facility for a model train was carried out to simulate actual aerodynamic noise and investigate low-noise bogie cavity designs. Through these tests, the bogie cavities under the train body were identified as being one of the major sources of aerodynamic noise. It was also found out that rounding cavity edges could be an effective measure to reduce low-frequency aerodynamic noise.
