Research On Nonlinear Damping Characteristics Of Suspension System Of Broad-gauge Electric Locomotive

Locomotives play a vital role in the transportation of the entire train.The dynamic performance of locomotives is of great significance to the efficiency of vehicle transportation.However,the gauges of different countries in the world are different,and many countries still use wide gauges due to geographical factors.With the proposal and implementation of the"One Belt,One Road"initiative,my country’s railway development has provided strong national-level strategic support for the development of China’s railways going out of the country and outside.Among them,the export business of my country’s rail vehicle equipment is also continuous for some countries and regions that apply broad gauges.Therefore,it is of great significance to strengthen the research of broad-gauge railway locomotives.This article takes an export-type C₀-C₀ axle broad gauge electric locomotive as the research object,mainly studies the influence of the damping characteristics of the locomotive suspension device on its various dynamic performances,and provides a theoretical basis for the selection of the damping parameters of the locomotive suspension device under different working conditions.Methods,the main research contents are:First,the multi-body dynamics software SIMPACK is used to establish a locomotive-track dynamics model including wheel-rail contact nonlinearity and shock absorber damping nonlinear characteristics.The model has a total of 90degrees of freedom.The AAR5 orbit spectrum is used as the orbital irregularity excitation.On this basis,the two-way ratio characteristics of the hydraulic shock absorbers of the primary and secondary suspension devices of the locomotive are calculated and analyzed.The Sperling index,operation stability,nonlinear critical speed,derailment coefficient and wheel load reduction rate of locomotive operation are calculated and analyzed.The comprehensive influence of the kinetic performance index.On the basis of determining the two-way ratio,taking stability as the optimization goal,combined with the relative speed distribution range at both ends of the shock absorber,the unloading speed and unloading damping force of a series of hydraulic shock absorbers are determined,and passed and the comparative analysis of unloading parameters of other schemes verifies the rationality of this scheme.Finally,according to the structure and working principle of a series of hydraulic shock absorbers,the mathematical model of its stretch and compression strokes is established,and the solution is solved by MATLAB/Simulink,and the normal-pass damping valve,supplementary damping valve and unloading are respectively calculated and analyzed.Under different operating conditions of the valve,structural parameters such as the cross-sectional area of the upper cavity of the hydraulic shock absorber and the cross-sectional area of the valve hole of the damping valve affect the damping characteristics of the shock absorber such as the bidirectional ratio.Through the research on the shock absorber of the locomotive suspension device,this paper further improves the dynamic performance of the locomotive under straight and curved conditions,and provides a theoretical basis for the development of the actual locomotive suspension device.