Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Analysis of Aerodynamic Noise Generation from Pantograph Using Panhead Models of Simple-Geometry and Its Reduction

팬헤드의 단순 형상 모델을 이용한 판토그라프 공력소음 발생 특성 분석 및 저감 방안

  • Yi, Suk-Keun (Department of Mechanical Engineering, Hanyang University) ;
  • Yang, Won-Seok (Department of Mechanical Engineering, Hanyang University) ;
  • Koh, Hyo-In (Korea Railroad Research Institute) ;
  • Park, Junhong (Department of Mechanical Engineering, Hanyang University)
  • Received : 2012.07.06
  • Accepted : 2012.10.09
  • Published : 2012.12.31
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Abstract

This study presents a result on aero-acoustic characteristics of pantograph panheads. To analyze the fluid flow around the panhead and resulting sound radiation, simple models of panhead were used in the numerical simulations called Lattice-Boltzmann method. The simulation results were verified using the wind tunnel test. The main aerodynamic noise was generated from the vortex shedding which is characterized by the Strouhal number, flow speed and geometry. The reduction in the radiated noise with simultaneously achieving increased lifting force was implemented for the simple rectangular geometry used in this study. Also, it was shown that the radiated sound power was significantly reduced by minimizing vortex shedding using through-holes or streamline shapes.

판토그라프 팬헤드의 공력소음 발생의 주요 인자와 영향을 미치는 변수를 분석하였다. 팬헤드 주변의 유체 유동과 결과적인 소음 방사를 분석하기 위해, 수치해석적인 방법 중 하나인 격자볼츠만 방법으로 팬헤드 단순모델을 사용했다. 풍동실험을 통해 측정된 결과로 시뮬레이션 결과를 검증했다. 와흘림이 주요한 공력소음 발생원인이며 Strouhal수, 유체의 속도 및 판토그라프의 형상에 영향을 받았다. 이 논문에 사용된 직사각형 형상을 통해 양력의 발생을 증가시키면서 방사 소음을 줄이는 팬헤드의 설계가 가능함을 제시하였다. 또한 통로나 유선 형상을 이용해 와흘림을 최소로 줄이면, 방사 소음을 크게 저감하는 형상의 설계가 가능함을 구축된 해석모델을 이용하여 검증하였다.

Keywords

References

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