A rigid–flexible coupling finite element model of coupler for analyzing train instability behavior during collision

Abstract

Rail vehicles generate huge longitudinal impact loads in collisions. If unreasonable matching exists between the compressive strength of the intermediate coupler and the structural strength of the car body, the risk of car body structure damage and train derailment will increase. Herein, a four-stage rigid–flexible coupling finite element model of the coupler is established considering the coupler buckling load. The influence of the coupler buckling load on the train longitudinal–vertical–horizontal buckling behavior was studied, and the mechanism of the train horizontal buckling instability in train collisions was revealed. Analysis results show that an intermediate coupler should be designed to ensure that the actual buckling load is less than the compressive load when the car body structure begins to deform plastically. The actual buckling load of the coupler and the asymmetry of the structural strength of the car body in the lateral direction are two important influencing factors for the lateral buckling of a train collision. If the strength of the two sides of the car body structure in the lateral direction is asymmetrical, the deformation on the weaker side will be larger, and the end of the car body will begin to deflect under the action of the coupler force, which in turn causes the train to undergo sawtooth buckling.

References

[1] Llana P, Jacobsen K, Stringfellow R (2020) Locomotive crash energy management vehicle-to-vehicle impact test results. In: Proceedings of 2020 Joint Rail Conference, April 20–22 2020, St. Louis, Missouri, USA. New York, The American Society of Mechanical Engineers

[2] American Public Transportation Association (2020) Purchase and acceptance of type H Tightlock Coupler Systems: APTA-PR-M-RP-003-98, Rev.2. Mechanical Working Group, Washington, DC

[3] British Standards Institution (2000) Structural requirements for railway vehicles: GM/RT 2100. Safety & Standards Directorate, Railtrack PLC, London

[4] European Committee for Standardization (2000) Railway applications-structural requirements of railway vehicle bodies: EN 12663-1:2010. British Standards Institution, London

[5] Japanese Standards Association (2006) Test methods for static load of body structures of railway rolling stock: JIS E 7105:2006. Japanese Industrial Standards Committee, Tokyo

[6] Ministry of Railways of the People’s Republic of China (1996) The strength requirement of railway vehicles design and Provisional Regulations on Identification Test: TB/T1335-1996. Institute of standard metrology, Ministry of Railways, Beijing (in Chinese)

[7] Hus TK, Peters DA. A simple dynamic model for simulating draft-gear behavior in rail-car impacts. J Manuf Eng 1978, 100 4 492-496

[8] Zhao H, Xu P, Li B . Full-scale train-to-train impact test and multi-body dynamic simulation analysis. Machines 2021, 9 11 297

[9] Yao Y (2020) Research on performance optimization of draft gear device on railway freight car. Dissertation, Dalian Jiaotong University (in Chinese)

[10] Jacobsen KM (2008) Collision dynamics modeling of crash energy management passenger rail equipment. Dissertation, Tufts University

[11] Milho JF, Ambrósio JAC, Pereira MFOS. Validated multibody model for train crash analysis. Int J Crashworthiness 2003, 8 4 339-352

[12] Xiao SN, Zhang ZX, Yang GW . Simulation method for couplers and buffers in train collision calculations. J Southwest Jiaotong Univ 2014, 49 5 831-836(in Chinese)

[13] Gruber P, Bayoumi M. Suboptimal control strategies for multi-locomotive powered trains. IEEE Trans Autom Control 1982, 27 3 536-546

[14] Lai J, Xu J, Wang P . Numerical investigation on the dynamic behaviour of derailed railway vehicles protected by guard rail. Veh Syst Dyn 2021, 59 12 1803-1824

[15] Cole C, Sun YQ. Simulated comparisons of wagon coupler systems in heavy haul trains. Proc Inst Mech Eng Part F J Rail Rapid Trans 2006, 220 3 247-256

[16] Lim S, Ji Y, Park Y. Simulation of energy absorption performance of the couplers in urban railway vehicles during a heavy collision. Machines 2021, 9 5 1-19

[17] Zhu T, Yang B, Yang C . The mechanism for the coupler and draft gear and its influence on safety during a train collision. Veh Syst Dyn 2018, 56 9 1375-1393

[18] Yao S, Zhu H, Yan K . The derailment behaviour and mechanism of a subway train under frontal oblique collisions. Int J Crashworthiness 2019, 26 2 133-146

[19] Yang C, Li Q, Xiao S . On the overriding issue of train front end collision in rail vehicle dynamics. Veh Syst Dyn 2018, 56 4 506-528

[20] Liu YW, Yang B, Xiao SN . Parameter study and multi-objective optimization for crashworthiness of a B-type metro train. Proc Inst Mech Eng Part F J Rail Rapid Trans 2022, 236 1 91-108

[21] Zhao H, Xu P, Jiang S . A novel design method of the impact zone of a high-speed train. Int J Crashworthiness 2020, 27 2 476-485

[22] Bounds S. Summary report on dynamic behavior of the whole train in collision and the improvement of the crashworthiness. Foreign Rolling Stock 2017, 54 5 1-7

[23] Jackiewicz J. Coupler force reduction method for multiple-unit trains using a new hierarchical control system. Railw Eng Sci 2021, 29 2 163-182

[24] Geike T. Understanding high coupler forces at metro vehicles. Veh Syst Dyn 2007, 45 4 389-396

[25] Wei L, Zeng J, Wang Q. Investigation of in-train stability and safety assessment for railway vehicles during braking. J Mech Sci Technol 2016, 30 4 1507-1525

[26] Shan W, Wei L, Chen K. Longitudinal train dynamics of electric multiple units under rescue. J Mod Transp 2017, 25 4 250-260

[27] Zhang JK, Zhu T, Yang B . Collision characteristics of the intermediate coupler of a rail vehicle. Veh Syst Dyn 2022

[28] European Committee for Standardization (2020) Railway applications—crashworthiness requirements for railway vehicle bodies: EN 15227:2020, British Standards Institution, London

Funding

National Natural Science Foundation of China(52172409)

Sichuan Outstanding Youth Fund(2022JDJQ0025)