NOISE SOURCES IN HIGH-SPEED TRAINS

초록

This paper discusses the quantification of the sources of external noise in high-speed trains. A thorough understanding of the underlying causes of noise generation in high-speed trains is needed in order to create effective noise control measures. For this study, the delay-and-sum beamforming method, which uses microphone arrays, was used to separate noise sources and analyze the sound characteristics of high-speed trains. First, a new microphone array with 96 microphones was used to measure the noises produced by high-speed trains. Then, sound maps were produced through the beamforming technique. The study determined that the majority of the noises produced by high-speed trains came from the nose of the power car, the phantograph and its cover, the bogie areas, and inter-coach gaps.