新幹線の台車部空力騒音の音響特性

抄録

Aerodynamic bogie noise of Shinkansen train is generated from the bogie section enclosed by side covers and ground. In this study, we studied the acoustic characteristics of the bogie noise, i.e. gain characteristics and the acoustic path, by using 1/7 scale train model in an-echoic room. Based on the reciprocal theorem, several microphones were installed inside the bogie cavity and a loudspeaker was installed besides the train model. It was found that noise generated from the bogie cavity is amplified especially in low frequency regions in spite of the side covers. Results of the impulse response obtained by TSP signal show these amplification is mainly due to the ground reflection.