Journal of the Computational Structural Engineering Institute of Korea (한국전산구조공학회논문집)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Sleeper Spacing Optimization for Vibration Reduction in Rails

철로의 진동제어를 위한 침목 간격 최적설계

  • Batjargal, Sodbilig (Graduate School of Science and Technology, Niigata University) ;
  • Abe, Kazuhisa (Department of Civil Engineering and Architecture, Niigata University) ;
  • Koro, Kazuhiro (Graduate School of Science and Technology, Niigata University)
  • Received : 2012.11.19
  • Accepted : 2012.12.03
  • Published : 2012.12.31
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Abstract

In this study, a theoretical investigation of optimized sleeper spacing which can suppress resonances of a railway track is attempted. To achieve this, we introduced a minimization problem in which the objective function is given by the wave transmittance and the design variable is defined by sleeper distribution. In the analysis the rail is modeled by a Timoshenko beam and the sleeper is represented by a mass. The infinite track analysis is realized by attaching the transmitting boundaries at both ends of the finite optimization region. Through numerical analyses the sleeper spacing effective in reduction of the transmittance is discussed. Furthermore, the feasibility of the proposed method is validated in the aspect of vibration reduction through response analyses for a harmonic load.

본 연구에서는, 철로(railway track)의 공명현상을 제어할 수 있는 침목(sleeper) 간격의 최적화에 대한 이론적 고찰을 소개한다. 이러한 현상을 제어하기 위해 목적함수가 파동 투과율(wave transmittance) 그리고 설계변수가 침목 분포인 최소화 문제를 제안한다. 해석에서 철제 궤도(rail)은 티모셴코(Timoshenko) 빔, 침목은 질량으로 표현하였다. 무한 철로는 유한한 최적설계 영역의 양 끝단에 투과경계조건(transmitting boundary)를 부여함으로써 구현하였다. 수치예제를 통하여 침목의 간격에 따른 투과율의 감소의 효과를 살펴보았다. 또한, 하모닉(harmonic) 하중 하에서 응답해석을 통한 진동의 제어 관점에서 제안된 방법의 적합성을 보였다.

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References

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