| Due to the large volume of railway transportation,high speed of transportation,high safety and high economic efficiency,railway transportation has become a very important mean of transportation in almost all countries in the world.At the same time,with the smooth implementation of my country’s “One Belt,One Road”strategy and the continuous improvement of our locomotive manufacturing capacity and innovative design level,our locomotive exports are also facing huge opportunities.Nevertheless,due to various historical reasons,the railways of various countries in the world have always been different.At the same time,the CIS countries that use wide gauges,such as Central Asia,are carrying out extensive and effective cooperation with our locomotive design and manufacturing units.Some contents stipulated in the national standards in wide-gauge railway countries are different from those in Chinese standards.When describing the evaluation indicators of locomotive dynamic performance in this paper,some are compared between Russian Standard GOST R 55364-2012 and current domestic standards.The drive system is a very important part of the bogie and has a great influence on the dynamics of the locomotive.In order to improve its running performance and meet the development needs of both passenger and cargo locomotives,this paper redesigned the driving device suspension mode of its bogie based on a certain wide-gauge electric locomotive model with rigid-axle driving suspension exported to a certain country in Central Asia;the locomotive models with rigid and flexible driving suspensions are established respectively by using the multibody dynamics software SIMPACK.Stability simulation is carried out on the American AAR5 track spectrum.The results show that the nonlinear critical speed of the flexible suspension model is increased distinctly and the stability of the locomotive is improved.The two types of locomotives are simulated through the straight line at different speeds.The results show that the flexible-driving-suspension locomotive can significantly improve the vertical stability of the rear end of the car body.And the lateral stability of the locomotive is also obviously improved.At the same time,the flexible suspension can significantly reduce the vertical and lateral vibration acceleration of the motor and improve the working environment of the motor.It can also greatly reduce the lateral force of wheel axle and improve the operating safety of the locomotive.Then let the two types of locomotives pass the R1000 m,R600m and the small radius R300 m curve lines respectively for simulations.The results show that the rigid-axle-suspension locomotive can only safely pass the R1000 m curve line within the speed range of 110km/h,the R600 m curve line within the speed range of 100km/h and the R300 m curve line within the speed range of 60km/h;while the flexible-suspension locomotive can safely pass the R1000 curve line within the speed range of 120km/h,the R600 m curve line within the speed range of110km/h and the R300 m curve line within the speed range of 75km/h.Finally,the influence of the stiffness values of the motor suspension nodes on the vibration performance of the flexible-suspension locomotive is studied and analyzed.The vertical stiffness of the motor suspension nodes is set to change in the range of 5~50KN/mm,and the lateral stiffness in the range of 2~5KN/mm.The analysis results show that the change of the suspension stiffness within the above range has little effect on the stability index of the car body.Compared with that on the motor,the lateral stiffness of the suspension has a more obvious effect on the lateral acceleration of the frame;when the speed is 150km/h,the vertical stiffness of the suspension has a more obvious effect on the vertical acceleration of both of the frame and the motor;the lateral stiffness of the suspension has a more obvious effect on the vertical acceleration of the frame and the motor.The effect on the lateral force of wheel axle is not obvious. |
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