新幹線用低騒音ブレーキディスクの開発

抄録

It is necessary to reduce the lower-part aerodynamic noise of Shinkansen to increase its speed. In this paper, we focused on aerodynamic noise of brake discs generated by air flow through the ventilation route of disc fins, which is a major noise source of lower-part noise. To investigate the noise generation mechanism, we conducted ventilation noise tests and it is found that the noise can be reduced by controlling the ventilation flow in disc fins. We improved shape of the disc rib based on the result and the improved disc reduced the overall noise by 2.8dB.