Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Weight Reducing of Aluminum Extrusion Profiles of a Railway-Car Body Based on Topology and Size Optimization

알루미늄 압출재로 이루어진 철도차량 차체의 경량화를 위한 최적설계 방안 연구

  • Han, Soon-Woo (Railway Structure Research Div., Korea Railroad Research Institute) ;
  • Jung, Hyun-Seung (Railway Structure Research Div., Korea Railroad Research Institute)
  • 한순우 (한국철도기술연구원 구조연구실) ;
  • 정현승 (한국철도기술연구원 구조연구실)
  • Received : 2010.11.10
  • Accepted : 2010.12.17
  • Published : 2011.02.01
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Abstract

In this study, we discussed the weight reducing of a urban railway-car body, in particular, of the Korean EMU, by optimizing topology and size of aluminum extrusion profiles. The heaviest parts of aluminum railway-car bodies, i.e., the base plate of underframe and side panels of side frame composed of double skin structures are considered for optimization. Topology optimization process is applied to obtain get an optimized rib structure for the base plate. The thickness of ribs and plates of the topologically optimized base plate and the existing side panel are also optimized by employing the size optimization process. The results are verified by comparing the maximum von Mises stresses and maximum deformation in the case of the existing design with those in the case of the optimized design. It is shown that the weight of a base plate and side panel can be reduced by 12% and that the weight of the whole car body can be reduced by 8.5%.

알루미늄 재질의 도시철도차량 차체의 경량화를 위해 이중 판재구조로 이루어진 철도차량용 알루미늄 압출재의 최적설계를 수행하였다. 위상최적설계 기법을 이용하여 알루미늄 차체에서 가장 큰 중량을 차지하는 하부 프레임 베이스 플레이트의 경량화된 위상을 도출하였고, 이를 기반으로 압출재 부재별 치수 최적화를 수행하였다. 하부 프레임 다음으로 큰 중량을 차지하는 측면 프레임 압출재에 대해서는 치수 최적화를 통하여 경량설계를 수행하였다. 최적설계안과 현재 설계의 최대발생응력과 최대 변형량을 비교하여 최적설계결과의 타당성을 검증하였다. 이 과정을 통하여 언더프레임과 사이드프레임의 중량을 현재보다 평균 12% 줄일 수 있었고, 차체 전체로는 8.5%의 경량화 효과를 얻었다.

Keywords

References

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