Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study of Noise Radiation Characteristics by Rail Vibration Reduction

레일 진동감쇄에 의한 소음방사 특성에 관한 연구

  • Kim, Jin-Ho (Smart Station Rearch Team, Korea Railroad Research Institute) ;
  • Jang, Dongdoo (Smart Station Rearch Team, Korea Railroad Research Institute) ;
  • Kim, Hee-Kyu (Structural Technology Institute, MORE Engineering & Architecture)
  • 김진호 (한국철도기술연구원 스마트역사연구팀) ;
  • 장동두 (한국철도기술연구원 스마트역사연구팀) ;
  • 김희규 ((주)모어엔지니어링건축사사무소 구조기술연구소)
  • Received : 2015.02.27
  • Accepted : 2015.04.09
  • Published : 2015.04.30
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Abstract

Rolling noise caused by the contact between the train wheels and rails is the main factor of noise generated by the operation of railway, therefore the features of rail vibration and its correlations with noise radiation should be identified. In this study, noise radiation generated from vibration were predicted by utilizing FE model with boundary element method. Noise radiation generated from vibration were predicted by utilizing FE model with boundary element method, and were compared with the measured noise in order to validate the reliability of the analysis method. In addition, the features of noise radiation according to the rail attenuation were examined in the frequency domain, and the noise radiation has been reduced by approximately 3dB(A) with additional rail damping.

철도의 운행으로 인하여 발생하는 다양한 소음 중 큰 부분을 차지하고 있는 전동소음의 경우 차륜과 레일의 접촉에 의하여 진동과 이로 인한 소음방사가 발생하므로, 레일 진동에 대한 특성과 이로 인한 방사소음과의 상호연관성 및 특성의 파악이 필요하다. 본 연구에서는 레일의 유한요소 모델을 구성하고 경계요소법을 이용하여 진동으로 인해 발생하는 소음방사를 예측하였다. 입력으로는 레일에서의 진동속도 계측치를 이용하였고 소음방사 예측결과를 계측결과와 비교하여 해석기법의 신뢰성을 검증하였다. 또한 레일 감쇄 특성에 따른 소음방사 특성을 주파수 영역에서 검토하여 레일 댐핑재의 적용에 따라 약 3dB(A)의 방사소음 저감 효과가 있음을 확인하였다.

Keywords

References

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