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ZOU Rui-ming, MA Wei-hua, LUO Shi-hui. Coupling stability of couplers between locomotive and vehicle[J]. Journal of Traffic and Transportation Engineering, 2016, 16(6): 48-54.
Citation: ZOU Rui-ming, MA Wei-hua, LUO Shi-hui. Coupling stability of couplers between locomotive and vehicle[J]. Journal of Traffic and Transportation Engineering, 2016, 16(6): 48-54.
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Coupling stability of couplers between locomotive and vehicle

  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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  • Author Bio:

    ZOU Rui-ming(1991-), male, doctoral student, +86-28-86466203, rmzou@outlook.com

    LUO Shi-hui(1964-), male, professor, PhD, +86-28-86466203, shluo@home.swjtu.edu.cn

  • Received Date: 2016-06-13
  • Publish Date: 2016-12-25
    Abstract
  • In order to figure out the coupling stability of couplers between locomotive and vehicle, apolygonal contact model was proposed to simulate the contact and friction of coupling surfaces between two couplers, namely, the surface of coupler knuckles was modeled by polygon way, so the contact area was determined and discretized.The contact force was solved by using the elastic foundation model, and the corresponding friction force was determined by the normal contact force and relative tangential velocity.The reliability of the presented modeling method was verified by coupler connection contour for locomotives and rolling stock(TB/T 2950—2006), interference analysis and finite element calculation.A dynamics model of heavy haul train was built to reflect the dynamics performance of middle locomotive and the dynamic behaviors of its coupler and buffer device.The coupling stability of couplers between locomotive and vehicle was analyzed when train runs down a long down-gradient with slope of 1.2% and negotiates a curve with 300 mradius under different conditions.Analysis result indicates that the coupler forces have major effect on the relative motion between the coupling surfaces of couplers, and normal contact force is generated between coupling surfaces of couplers due to stable coupler force.Ifthere exist relative motion or the motion tendency between coupling surfaces of couplers, the relative motion of coupler is prevented by the generated tangential friction force.When coupler force is fluctuant or smaller, couplers are effortless in a state of free clearance, therefore, greater relative motion occurs because generating constraints are not sufficient.The maximum vertical relative displacement of the moment reaches to approximately 149.5 mm.About 4.5° of maximum relative angle is produced in horizontal plane to compensate the deflection behavior of the couplers when negotiates a curve with 300 mradius.

     

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