Abnormal Vertical Dynamic Performance of Subway Vehicles  

作　　者：MA Weihua LUO Shihui SONG Rongrong 

机构地区：[1]Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China [2]CSR Ziyang Locomotive Co., Ltd., Ziyang 641301, China [3]College of Computer Science and Technology, Southwest University for Nationalities, Chengdu 610041, China

出　　处：《Chinese Journal of Mechanical Engineering》2010年第2期174-179,共6页中国机械工程学报（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant No.50775191);National Basic Research Program of China (973 Program,Grant No.2007CB714701);PhD Programs New Teacher Foundation of Ministry of Education of China (Grant No.20090184120006);the State Key Laboratory Free Research Fund of China(Grant No. 2008TPL_T03);Science and Technology Development Fund of Southwest Jiaotong University,China

摘　　要：A serious wheel out-of-round phenomenon exists in a certain subway vehicle in China. More seriously, the vertical vibration of car body of this subway vehicle will go beyond the restriction of the standard criterion when the wheel out-of-round exceeds 0.2 mm in radial direction. And the wheel out-of-round problem could not be solved by polishing the rail or re-profiling wheels. Aimed at this problem, a further analysis is conducted on the structure and the suspension systems of the subway vehicle. It is thought that the additional stiffness function of the traction bar, caused by the short length and the bigger connection stiffness of the traction bar, leads to the problem that the subway vehicle is sensitive to the vertical impact. By taking into account the stiffness of the traction bar, dynamic simulation models of the subway vehicle are set up to study the influence of the additional stiffness function of the traction bar on the vertical dynamic performance of the subway vehicle through the simulation method. The response of the subway vehicle to vertical impact of a triangle pitch is also simulated. Simulation results indicate that the connection between the car body and the bogie will become rigid and the damping function of the secondary suspension will be decreased due to the additional stiffness of the traction bar in braking condition or running on curve track. Then the vertical response of the car body to vertical impact will be strengthened and the vertical ride index decreased. The vertical dynamic performance of the subway vehicle will be improved through the method of decreasing the connection stiffness of the traction bar, which has been validated by the simulation results. This method of improvement can effectively solve the problem of abnormal dynamic performance of this subway vehicle, and provide a foundation for a new theory about the traction bar system design.A serious wheel out-of-round phenomenon exists in a certain subway vehicle in China. More seriously, the vertical vibration of car body of this subway vehicle will go beyond the restriction of the standard criterion when the wheel out-of-round exceeds 0.2 mm in radial direction. And the wheel out-of-round problem could not be solved by polishing the rail or re-profiling wheels. Aimed at this problem, a further analysis is conducted on the structure and the suspension systems of the subway vehicle. It is thought that the additional stiffness function of the traction bar, caused by the short length and the bigger connection stiffness of the traction bar, leads to the problem that the subway vehicle is sensitive to the vertical impact. By taking into account the stiffness of the traction bar, dynamic simulation models of the subway vehicle are set up to study the influence of the additional stiffness function of the traction bar on the vertical dynamic performance of the subway vehicle through the simulation method. The response of the subway vehicle to vertical impact of a triangle pitch is also simulated. Simulation results indicate that the connection between the car body and the bogie will become rigid and the damping function of the secondary suspension will be decreased due to the additional stiffness of the traction bar in braking condition or running on curve track. Then the vertical response of the car body to vertical impact will be strengthened and the vertical ride index decreased. The vertical dynamic performance of the subway vehicle will be improved through the method of decreasing the connection stiffness of the traction bar, which has been validated by the simulation results. This method of improvement can effectively solve the problem of abnormal dynamic performance of this subway vehicle, and provide a foundation for a new theory about the traction bar system design.

关 键 词：SUBWAY wheel set TREAD out-of-round dynamic 

分 类 号：U270.331[机械工程—车辆工程] U231[交通运输工程—载运工具运用工程]