Measurement and reduction of aerodynamic noise generated from the bogie section of high-speed trains by wind tunnel test

Abstract

Aerodynamic noise generated from the bogie section is one of main sources when high speed trains run above 300km/h. Therefore, it is important to reduce the aerodynamic bogie noise appropriately. In this paper, the countermeasures to control the noise are investigated under the cavity condition. In order to examine the effect of the countermeasures on the aerodynamic noise, a wind tunnel test was carried out by using two-dimensional microphone array, which were set under the bogie. Two countermeasures to control flow at the bogie, i.e. deflector and rounding the edges of cavity, were developed. It is found that the noise is reduced properly by both countermeasures under the cavity condition.