| Locomotive development up to now it has been an essential link in the modern transport network and logistics network,in the world’s countries in the railway transport is an important link.Since our country started the international project of "One Belt And One Road",our railway locomotives are exported to all countries because of their superior performance.But because the railway gauge of each country has the difference,our country in the locomotive design room must adapt to the standard request of the export country.Suspension system is an indispensable part of a locomotive.Whether its parameters are reasonable or not plays an important role in the operation of a locomotive.The previous research simplifies the locomotive suspension system,for example,the suspension is simplified as a spring with greater stiffness,and other components take it as a linear component.There is a certain error between the simulation results and the actual running of the locomotive.There are relatively few researches on the critical speed of wide gauge electric locomotive in China.In this paper,a dynamic model of a wide gauge electric locomotive is established to judge the dynamic performance of the locomotive.The spring parameters of locomotive suspension system are analyzed to verify whether the design parameters conform to the standards of domestic and export countries.Consider non-linear factors in the locomotive,such as a series of vertical shock absorbers and transverse stops.This paper analyzes the dynamic performance of locomotive in straight line and curve running,analyzes the nonlinear critical speed and stability index under straight line operating conditions and four indexes of safety under curve operating conditions.Exampled by a certain model of export of belarus as the research object,through the establishment of a complete SIMPACK locomotive model,and according to Г О С Т standard is dynamic evaluation method,analysis respectively first,second level suspension stiffness of the locomotive car nonlinear lateral stability,lateral stability,a variety of curve under the condition of wheel/rail lateral force,derailment coefficient,the influence of the wheel weight reducing load rate.According to the results of the study,the stability analysis shows that: the longitudinal and transverse stiffness of the first system is 120 m N /m and 4m N /m,respectively;the longitudinal and transverse stiffness of the second system is 0.2m N /m,and the performance is better.According to the stability analysis,the longitudinal stiffness of the locomotive has little influence on the stability.The lateral stiffness of the first train should be greater than 2m N /m,and the lateral and longitudinal stiffness of the second train should be within 0.1-0.2m N /m.Passability analysis of the curve shows that: the lateral stiffness of the first series is better at 4Mn /m,and the longitudinal stiffness of the first series has little influence.The larger the longitudinal and transverse stiffness of the second train,the smaller the safety factor of anti-derailment stability,and the worse the curve passing performance.The analysis results in this paper can provide reference for the selection of suspension parameters of this type of locomotive. |
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