Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Noise Sources Localization on High-Speed Trains by using a Microphone Array

마이크로폰 어레이를 이용한 고속철도 차량의 소음원 도출 연구

  • 노희민 (한국철도기술연구원 고속철도연구본부) ;
  • 조준호 (한국철도기술연구원 에코시스템연구실) ;
  • 최성훈 (한국철도기술연구원 고속철도연구본부) ;
  • 홍석윤 (서울대학교 조선해양공학부)
  • Received : 2011.11.07
  • Accepted : 2011.12.05
  • Published : 2012.02.26
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Abstract

In this paper, noise of Korean high-speed trains (KTX) running at different speed from 150 to 300km/h was measured by a microphone array system. From the measurement, relation between maximum sound pressure levels and train moving speeds of KTX was drawn and a regression coefficient from the relation was also derived. Moreover, increases of SPL with speeds of KTX were analyzed in the frequency domain. From the analysis, sound characteristics of passing-by noise of KTX were provided. Then, dominant noise source areas were obtained from the measurements and propagation patterns of KTX in vertical direction were also investigated. Finally, noise sources of KTX were identified from inspection of noise maps.

본 논문에서는 고속 철도 차량의 주행 속도 150~300km/h에서 발생하는 음압을 마이크로폰을 이용하여 측정하고, 주행 속도의 증가에 따라 발생하는 음압의 특성을 분석하였다. 분석된 결과를 통해서 고속철도 차량의 속도 증가와 음압의 관계식을 도출하였으며, 주파수 영역에서 속도 증가에 따른 음압의 증가 특성을 검토하였다. 또한 주행소음 분석을 통해서 고속철도 차량의 주요 소음 발생 위치를 추정하였으며, 마이크로폰 어레이를 활용한 소음지도 분석을 통해서 고속철도 차량의 소음원의 위치를 도출하였다.

Keywords

References

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