抄録
This study is an experimental investigation with a small-sized model on aerodynamically generated noise of high-speed trains running in a guide-way, which consists of two sidewalls and a bottom. According to the sound field data measured for real trains, a main contributor to the noise has been identified as aerodynamic sound from the truck with a cavity in it. Through the model tests in which an acoustically permeable plate is adopted as the bottom of the guide-way, we have found that a principal source of the sound locates at the bottom opening of the cavity of the truck. We have also confirmed the effect of some devices that are expected to reduce the noise.
