Effect Of Curve Geometric Parameters On The Performance Of Driving In Urban Rail Transit

There is an increased awareness of the effect of curve setting on the operation of urban rail transport on recent years. Firstly, a train-track interaction dynamic model was established considering the B-type standard vehicle and characteristics of the line. Secondly, the effect of geometrical parameters on running performance of urban rail vehicles was investigated. Finally, several geometrical parameters of the line were optimized using Neural Networks and Genetic Algorithms. The results show that:1) The eigen frequencies of vehicle vibration are in the range from1Hz to5Hz. The vehicle is more sensitive to irregularities whose wavelength are within5-20m. The effect of horizontal and vertical stiffness of the primary suspension on vehicle running performance is obvious:With increasing primary suspension stiffness, dynamic response of the vehicle in this range reduces, while critical speed and stability of the vehicle increase. It also leads to increasing wheel-rail force and wear index, which is not conducive to the curve-passing performance of the vehicle.2) The wear of rail can be reduced and the running performance of vehicle can be improved with an appropriate cant deficiency. On the contrary, surplus superelevation is not conducive to the performance of vehicle. Under this state, curve radius increasing can reduce wear, but it will lead to the increase of wheel rail force Wheel-rail contact status can be influenced by setting of the rail cant. In the case of measured wheel profile congregated with standard LM rail in this paper, poor wheel-rail contact status occurs with the rail cant ranging from1/15to1/25.3) As a result of measured wheel profile congregated with standard LM rail in this paper, the rail cants of the rail in straight line are suggested to be1/32-1/36, respectively. The rail cants of the inside and outside rail in curved line are suggested to be1/39.7and1/44, respectively.