Study On Vertical Coupling Dynamic Performance Of Six-axis Wide-gauge Electric Locomotive

In order to meet the different needs of the rail transit equipment market in the CIS countries and respond to the "One Belt One Road" initiative,the subject is based on a major science and technology project in Shanxi Province.In order to improve the dynamic characteristics of six-axle wide-gauge electric locomotives for both passenger and freight transport,this article mainly studies Locomotive body-frame-wheelset-track vertical coupling dynamics performance,analyze the influence of suspension system on car body stability and comfort.This article first introduces the dynamic evaluation index and track irregularity excitation of six-axis wide-gauge electric locomotive.The frequencydomain track spectrum is transformed into a related simulation time series by inverse Fourier transform,and the numerical simulation image of the track spectrum is obtained.The force analysis of the six-axle wide-gauge electric locomotive’s body-frame-wheelset components is carried out,and the vertical vibration equation is established.The state space method is used to solve the vibration equation,and the output result meets the evaluation index of locomotive dynamics.Then the simulation software is used to establish the dynamic model of the six-axle wide-gauge electric locomotive,and the nonlinear critical speed is simulated by two methods,and the nonlinear critical speed meets the relevant requirements.In the speed range of 60-160km/h and under the excitation of the AAR5 track spectrum,the effect of the primary suspension stiffness,the secondary suspension stiffness and the primary and secondary suspension vertical stiffness on the vertical dynamic performance of the locomotive in the linear track operation is studied.influences.The results show that the vertical stiffness of the primary and secondary suspension has a greater impact on the vertical stability of the locomotive,the wheel-rail vertical force,and the vertical dynamic load coefficient;the lateral stiffness and longitudinal stiffness of the primary and secondary suspension have a significant effect on the vertical dynamics of the locomotive performance impact is small.Finally,the locomotive passes through the R400 m,R600m,R800 m,and R1000 m tracks in the speed range of 70-130km/h and under the excitation of the AAR5 track spectrum to study the effect of the vertical stiffness of the primary suspension and the vertical stiffness of the secondary suspension on the derailment coefficient and vertical direction of the locomotive.The influence of dynamic load factor.The results show that the vertical stiffness of the primary and secondary suspension has little effect on the derailment coefficient;the higher the locomotive running speed,the greater the derailment coefficient;when the vertical stiffness of the primary and secondary suspension gradually increases,the vertical vibration acceleration of the locomotive body and the car The vertical Sperling index increases,and the vertical stability becomes worse.