Localization of Sound Sources on High-Speed Trains

초록

In this paper sound sources of a high-speed train system allowing speeds above 400km/h are investigated. An accurate noise source identification and noise prediction model incorporating wheel/rail rolling noise as well as aero-acoustic noise at speeds above 400km/h is needed. The research project is primarily aimed at developing such a noise prediction tool including noise prediction model and an identification system of the noise sources of a moving train with the high-speeds. A measurement system comprising multi-channel microphone array and a pair of photo sensors. The measured sound pressure signals are processed using a delay-and-sum beam forming algorithm in order to get the positions of the noise sources on the source plane. The microphone array system presented in this paper is an efficient tool both to validate the new prediction model and to help to design new low-noise high-speed trains. The results of the field tests on the noise source identification of high-speed trains are shown and discussed.