Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Analysis and Evaluation of Reduction of Impact Force in a Coupler when a Long Freight Car Brakes

장대화물열차 제동 시 연결기에 발생하는 충격력 해석 및 분석

  • Lee, Jeong Jun (Department of Rolling Stock System, Seoul National University of Science and Technology) ;
  • Koo, Jeong Seo (Department of Rolling Stock System, Seoul National University of Science and Technology) ;
  • Cho, Byung Jin (Department of Rolling Stock System, Seoul National University of Science and Technology) ;
  • Na, Hee Seung (Korea Railroad Research Institute) ;
  • Mun, Hyung Seok (Korea Railroad Research Institute)
  • 이정준 (서울과학기술대학교 철도차량시스템공학과) ;
  • 구정서 (서울과학기술대학교 철도차량시스템공학과) ;
  • 조병진 (서울과학기술대학교 철도차량시스템공학과) ;
  • 나희승 (한국철도기술연구원) ;
  • 문형석 (한국철도기술연구원)
  • Received : 2017.12.07
  • Accepted : 2018.02.08
  • Published : 2018.02.28
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Abstract

In long freight trains, there is a brake time delay in the neighboring freight cars that causes damage and fractures of couplers, especially the knuckle of them. If there is a problem for couplers in the cars, this could cause a derailment and lead to damage of human life and property damage. In this study, maximum forces on the couplers are studied when a long freight car brakes, with brake delay time and coupler gap. We have made a dynamic model of 50 freight cars and couplers, applying contact between couplers and a characteristic curve for expressing force and displacement of buffers with SIMPACK, a multi-body dynamics program. We use EN 14531-2 from the British Standards Institution, a standard of freight car brakes for the verification of the dynamic model. We also use a simplified method to analyze the dynamic model of 50 freight cars. With changing coupler gap and brake delay time, we do comparative analysis with AAR M-201 from the Association of American Railroads, a standard of AAR couplers. From this result, we find that the standard on fatigue limit is satisfied, such that the brake delay time is within 0.06 second if the coupler gap of the AAR coupler is within 20 millimeters.

Keywords

References

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Cited by

  1. 장대화물열차의 분산제어 제동 시 연결기에 발생하는 충격력 해석 및 분석 vol.18, pp.2, 2018, https://doi.org/10.14775/ksmpe.2019.18.2.065