Investigation On Safety Stability Margin Regulation For The Long Grouping High-Speed Train

During test running of Beijing-Shanghai HSR line, the coach shaking phenomenon in high-speed of some motor-vehicle coaches (the first coach, last coach and dining coach) were emerged from the long grouping high-speed train. The situation at that time was very serious: According to the acceptance test results, the coach shaking phenomenon was very apparent when the speed more than300km/h, the acceptance inspection of the new train was very difficult, the subsequent work of joint debugging and commissioning could not continue; The response of SIEMENS was that:never met this kind of the phenomenon.Firstly, in order to find out the coach shaking phenomenon in high-speed, the contrast analysis between the acceptance test data and the dynamic simulation analysis is complemented. For the different of the sampling system and the limitation of the wheel/rail contact friction model, it is failed to get any clues for the analysis of the reason. Secondly, the dynamic simulation analysis and acceptance test is complementary, the new ideas of reason analysis is found from the regular influences of the anti-hunting in-series stiffness to the stability property of motor bogie, and further proved by the lateral acceleration spectrum characteristics contrast of bogie frame. Finally, the determining criterion is formulated for the anti-hunting in-series stiffness in the foundation of testrig measuring of anti-hunting damper, the technical strategy is proposed for elimination the coach shaking phenomenon in high-speed, the sample vehicle after the commissioning successfully passed the test running. The timely solved of the coach shaking phenomenon in high-speed win over the limited time for the joint debugging and commissioning of Beijing-Shanghai HSR line. Through the above model simulations and test comparisons, the following conclusions are drown:(1) Since the lateral-elastic-swung modes of motor suspensions are introduced due to the frame-elastic-suspensions of traction motors, from which the stability property of motor vehicle becomes complexity and forms the stability nonlinearity. The coach shaking phenomenon is a technical problem caused by the stability nonlinearity of motor vehicle.(2) In the foundations of acceptance test, testrig measuring of anti-hunting damper and dynamical simulation analysis, the explicit deduction can be achieved that the stability margin of rear motor bogie becomes worst due to the unduly increase of anti-hunting in-series stiffness, which is the main reason about the coach shaking in high-speed, and has been validated in the acceptance test after being adjusted. (3) the theory optimal value of the anti-hunting in-series stiffness is for (2-2.5)X, the anti-hunting damper the end-joint radial stiffness is for (16-20) MN/m. Considering the (350-380) km/h operation requirements of Beijing-Shanghai HSR line and the rubber ageing problems of the anti-hunting end node, the actual commissioning strategy is adjusted the anti-hunting end node radial stiffness to25MN/m. So there is a bequeathal problem:the of the coach shaking phenomenon in high-speed can happen in the new wheel/rail contact.