Research On The Dynamic Characteristics Of A Certain Type Of Wide-gauge Electric Locomotive Based On Flexible Architecture

In recent years,China’s economy has made rapid progress,and the railway industry has also flourished.The current development trend of railway transportation is towards faster operating speed,lighter quality,and heavier load.The rapid development of railways in turn has promoted rapid economic development.With China’s increasing emphasis on the development of railways,there is a demand for relevant departments to keep up with the times and accelerate the upgrading of railway vehicles.With the continuous increase of vehicle speed,the impact of elastic vibration on the vehicle system under high-speed conditions cannot be ignored.As a very important part of the locomotive,bogie frame plays a connecting role.In this paper,a wide gauge electric locomotive is taken as the research object,and the flexible frame is introduced into the locomotive dynamic model to study its impact on the locomotive dynamic performance in different paths.This paper first introduces the dynamic evaluation index of the rail vehicle and the track irregularity excitation,then establishes the finite element model of the bogie frame of the wide gauge electric locomotive in ANSYS,and carries out modal analysis and Substructure analysis to obtain the flexible body frame.Through the research on the components of the wide gauge electric locomotive,the mathematical model including the locomotive body,bogie,wheel set and primary and secondary suspension systems is established.The locomotive dynamic model is established in SIMPACK according to the actual parameters of the wide gauge electric locomotive,and the flexible body frame is introduced into the locomotive dynamic model to generate the rigid flexible coupling model of the flexible frame locomotive.Using the US Level 5 track spectrum as an external excitation,the dynamic performance of two models during straight line driving was compared and analyzed.The conclusion was drawn that the vertical and lateral stability indicators of the flexible frame locomotive model showed a slight increase compared to the rigid frame locomotive model;The vertical and lateral vibration accelerations of the flexible frame are greater than those of the rigid frame,which is due to the modal vibration of the frame being excited by the vehicle during driving;The flexible structure will increase the wheel rail force of the wheel set,which is not conducive to the safe operation of the locomotive.By setting different curve radii of R1000 m,R600m,and R300 m to study the negotiation performance of two models with different curves,it is concluded that compared to rigid frames,flexible frames can increase the derailment coefficient,wheel load reduction rate,and wheel rail force of locomotives;Both rigid and flexible frame locomotives can safely pass through the R1000 line at a speed of 120km/h;Rigid frame locomotives can safely pass through the R600 curve line at a speed of 100km/h,while flexible frame locomotives can safely pass through the R600 curve line at a speed of 90km/h;Rigid frame locomotives can safely pass through the R300 curve line at a speed of 65km/h,while flexible frame locomotives can safely pass through the R300 curve line at a speed of60km/h.The flexible structure will reduce the curve negotiation performance of the locomotive.