Influences Of Crosswind Disturbances To Safety And Stability In HSR Practices

From the safety viewpoint of High-speed Rail (HSR) practices, it should give enough attention to the issue of crosswind perturbation. According to the stability analysis of the closed-loop system, the stability robustness of high-speed trains is one of the important indicators to ensure the stability and safety in the HSR practices. The service condition is uncertain and complex, the conservative investigating opinion was therefore proposed of perturbation scale. The opinion is in order to determine the maximum allowable perturbation scale of high-speed trains under the outside perturbations based on the benchmark model.Combined with structural features of European cars, the main job is the anti-disturbance analysis of the transient crosswind and steady-state crosswind, which is to illustrate the disturbance of the border and robust stability of the high-speed train. Steady crosswind conditions choose the crosswind in the curve as a typical condition, rather than crosswind in the straight track. Through the wheel unloading rate less than0.6as the mandatory target, the relationship between anti-disturbance ability of the carbody and velocity was obtained. Results in good agreement with the Ministry of Railways under the maximum allowed wind speed15m/s. The transient crosswind condition selects the wake flow disturbing when getting off the tunnel as a typical condition. Take the three-trainset vehicle as the research object, and then analysis the anti-disturbance ability under the four classic parameter configurations. The four parameter configurations are original configuration of the EMU, original configuration of the long trainset, in-site regulation of the long trainset and optimal regulation. Take the lateral track-shift force as a safety limit criteria, comparative analysis of the anti-disturbance ability based on the wake flow showed that the bogie with the original configuration has the worst ability to resist the crosswind. Others have the equal anti-disturbance abilities, but the optimal regulation has the perfect stability robustness.Thus, there are two basic problems of instability in HSR practices:the stability margin of the bogie is not sufficient and the problem of stability robustness, and caused many of the typical vibration failures. The conservative opinion of large-scale perturbation was therefore proposed to improve the stability robustness of High-speed trains. Because of the high impedance of the second suspension of high-speed bogies,2Hz filtered data can not be used to calculate the wheel unloading rate. It should be specially pointed out that the train must be slow down once encounter the crosswind such as the400km/h detected trains. Anti-disturbance ability comparative analysis based on the three-trainset found that configuration parameters directly affect stability robustness of high-speed trains. Bogie with the original configuration has the worst ability to resist the crosswind. Bogie of the long trainset has the insufficient stability robustness. If European cars achieved the bogie with optimal regulation, it is not only has the good resistance to crosswind, but also has the perfect stability robustness. Even though the economic speed can arrived to350km/h under the optimal regulation, but taking into account the service condition, commercial speed of300km/h is the best economic running speed.The research works in this paper are supported as follows:1.National Science technology Support Plan Project:the part of common foundation and system integration technology: National Key Technology R.&D. Program (2009BAG12A01);2.The R.&D. Planning Project of the Ministry of Railway, China:A robust regulation strategy of safety stability margin for HSR (Project No:2011J013-B);3.The Opening Research Foundation of National Power Traction Laboratory of Southwest Jiaotong University:A robust regulation strategy of safety stability margin for HSRS (Project No. TPL1102).