Proceedings of the KSR Conference (한국철도학회:학술대회논문집)

The Korean Society for Railway (한국철도학회)
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Construction of a Microphone Array to Localize Noise Sources of Railway Trains

철도 차량의 소음원 측정을 위한 마이크로폰 어레이 설계

  • 최성훈 (한국철도기술연구원, 차세대고속철도사업단) ;
  • 노희민 (한국철도기술연구원, 차세대고속철도사업단) ;
  • 조준호 (한국철도기술연구원, 친환경연구실) ;
  • 고효인 (한국철도기술연구원, 친환경연구실)
  • Published : 2011.10.20
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Abstract

This paper deals with the design of a microphone array to measure location and spectral characteristics of railway noise sources. A microphone array estimates the direction of a noise source assumed as a point source using the delayed-sum beamforming method and its performance is determined in terms of resolution and side-lobe level. A 48 channel microphone array was already developed to measure noise sources of KTX trains and a new array with 96 microphones has been designed to enhance the performance. This paper simulates the performance the microphone arrays according to the configuration of microphones and verifies it through on-site tests.

Keywords