列車模型の射出試験による低周波空力音の実験的評価

（第２報，台車部形状を再現した模型試験）

抄録

It is known that bogie cavities of Shinkansen trains are major aeroacoustic sound sources of low-frequency noise, which is difficult to insulate with noise barrier. In this paper, an experimental facility that can launch a train model at high velocities is used to investigate the low-frequency noise sources. 1/33.1 scale train model with 6 bogies (4-car train model) are used .The comparative study of flat, bogie cavities and bogies with side covers shows that bogie cavities generate low-frequency aeroacoustic sound, and full-height side covers reduce that sound effectively, compared with half-height side covers .