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Analysis of Interior Noise of KTX in Tunnel with Concreted Track

콘크리트 궤도 터널 내 KTX 차량의 실내소음 특성 분석

  • 김재철 (한국철도기술연구원 철도시스템연구본부) ;
  • 이찬우 (한국철도기술연구원 철도시스템연구본부)
  • Published : 2007.11.20

Abstract

KTX trains show a high interior noise level in tunnel with concreted track at 300 km/h. Generally, the concreted track has higher sound emissions compared with ballasted track due to the reduced absorption and the major sources of interior noise for KTX are known as the aerodynamic noise and rolling noise. Therefore, It is necessary to find out noise source and noise components to affect interior noise in tunnel with concreted track. In this study, we measure the noise and vibration inside KTX in tunnel in order to find the cause of the interior noise of KTX. The analysis results show that the interior noise of KTX in tunnel with concreted track is increased sharply by a low frequency below 80 Hz. We know that the low frequency noise inside KTX in tunnel with concreted track is generated at the natural frequency of carbody by aerodynamic noise outside gangway and rolling noise. In order to reduce the noise level at 80 Hz, modification of mud-flap length between carbodys is suggested and the effect of noise reduction is examined in tunnel with concreted track.

References

  1. Kim, J. C. 2004, 'Basic Research to Find out Reduction Method of Interior Noise for KTX in Tunnel', Research Report, Korea Railroad Research Institute
  2. Kouichi. Kubomura, 1997, 'Development of Noise Absorbing Material for Track', WCRR' 97, pp. 307-313
  3. Park, C. H., 1998, 'Development of Reduction Technology and Analysis for Noise/Vibration', Research Report, InHa University
  4. Kim, J. C., 2005, 'Analysis of Interior Noise for KTX in Tunnel with Concreted Track' Proceedings of the KSNVE Annual Autumn Conference, pp, 25-28

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