高速走行する鉄道の台車部空力音と床下流速分布の測定

抄録

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. In order to examine the effect of the countermeasures on the aerodynamic noise, a wind tunnel test was carried out by using a two-dimensional microphone array and Pitot tube rake. Two countermeasures to control flow at the bogie, i.e. deflector and concaved bottom section, were developed. It is found that the flow speed was reduced by these countermeasures, and that the aerodynamic bogie noise was properly reduced by the deflector, however, the reduction by the concaved bottom section was seen only in lower frequencies.