Abstract
In the past studies, when train runs at the speed about 300km/h, one of major aerodynamic noise sources below 100Hz is bogie cavities. In order to reduce the aerodynamic bogie noise efficiently, it is necessary to make a better understanding of the noise. In this paper, the mechanism of the aerodynamic bogie noise is investigated with a 1/70 scale train model using launching facility. Through the scale model experiment, it is found that the bogie cavity space is important to reduce the aerodynamic noise. So, we investigate the rounding or tapering edge of the bogie cavity. As the results, their edges of the bogie cavity are effective to reduce the aerodynamic noise.
