Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Prediction Model of the Sound Transmission Loss of Honeycomb Panels for Railway Vehicles

철도차량용 허니콤재의 차음성능 예측모델

  • 김석현 (강원대학교 기계메카트로닉스 공학부) ;
  • 백인수 (강원대학교 기계메카트로닉스 공학부) ;
  • 이현우 (강원대학교 기계메카트로닉스) ;
  • 김정태 (홍익대학교 기계공학과)
  • Published : 2008.10.30
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Abstract

Sound transmission characteristics are investigated on the honeycomb panels used for railway vehicles. Equivalent orthotropic plate model and equivalent mass law are applied to predict the sound transmission loss (STL) of the honeycomb panels. The predicted values of the STL are compared with the measured values. The reliability and the limitation of the prediction models are investigated. Coincidence effect and local resonance effect on STL are considered. The result of the study shows that the equivalent orthotropic plate model can be used as a good prediction model, if the local resonance frequency is properly applied. finally, ways to improve the severe STL drop by local resonance are proposed and the effect on the sound insulation performance is analysed.

본 논문에서는 철도 차량용 허니콤 판재를 대상으로 음투과 손실을 검토한다. 허니콤재의 음투과 손실을 예측하는 데에는 등가 직방성 평판 모델과 등가 질량법칙을 적용한다. 음투과 손실의 예측치를 측정치와 비교하여 예측 모델의 신뢰도와 한계를 검토한다. 또한 일치효과와 국부공진 효과가 차음성능에 미치는 효과를 검토한다. 본 연구는 국부공진 주파수대역을 적절히 적용한다면, 등가 직방성 평판 모델을 허니콤재의 음투과손실 예측모델로 사용 할 수 있음을 보인다. 최종적으로, 국부 공진에 의한 차응성능의 급격한 저하에 대한 대책을 제시하고 그 차음 성능에 대한 효과를 분석한다.

Keywords

References

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