장대화물열차 제동 시 연결기에 발생하는 충격력 해석 및 분석 = Analysis and Evaluation of Reduction of Impact Force in a Coupler when a Long Freight Car Brakes

다국어 초록 (Multilingual 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.

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 화물열차 연결 장치 및 제동 관련 규정
• 3. 다물체 동역학 프로그램을 이용한 장대화물열차 동역학 해석
• 4. 결론 및 고찰
• References

참고문헌 (Reference)

1 변성광, "듀얼 레일 형상에 적합한 철도차량의 차륜 형상 설계" 한국기계가공학회 16 (16): 30-37, 2017

2 Nasr, A., "The effects of train brake delay time on in-train forces" 224 (224): 523-534, 2010

3 British Standards Institution, "Railway applications. Methods for calculation of stopping and slowing distances and immobilization braking, BS EN 14531-2"

4 "RAILWAY INVESTIGATION REPORT, Transportation Safety Board of Canada" 2013

5 Alves, L., "Improving the draft system components performance for iron ore transportation" 610-616, 2015

6 Cheli, F., "Freight trains dynamics: effect of payload and braking power distribution on coupling forces" 55 (55): 464-479, 2016

7 Seshu, P., "Failure analysis of railroad couplers of AAR type E" 18 (18): 374-385, 2011

8 Miner Enterprises, "Crown SE"

9 Association of American Railroads, "Couplers and Yokes, AAR Approved-Purchase and Acceptance, AAR M-211"

10 Na, H. S, "A study about cargo transportation system and transshipment optimization for technology for a connection of railway between North and South Korea and Northeast Asia continent" Korea Railroad Research Institute 2015