Experimental Research On Dynamic Behavior Of Signal Wheelset Under Saturated Adhesion

With the application of the high-power locomotive and the improvement of the singleaxle power,it is particularly important to make full use of the wheel-rail adhesion and improve the traction force of the locomotive,and to optimize the dynamic performance of the locomotive under the saturated adhesion.The paper proposed to studied the dynamic characteristics of the saturated adhesion of single wheelset under driving condition by experiment.Firstly,a simplified dynamics model of single wheelset driving system was established,and three kinds of creep force calculation models were compared and Simulink was used for simulation analysis;Three control methods of PI control,fuzzy control and fuzzy PI control were used to compare and analyze the simulation of single wheelset adhesion control.Then,a 1:5 ratio single wheelset drive test rig was designed and built.The data acquisition system and creep rate control system of the test rig were built based on real-time simulator,rotary encoder and Matlab/Simulink simulation software,which were used to test and study the creep rate control strategy and the dynamic characteristics of the wheelset under saturated adhesion.Finally,by using resistance strain gauge and wireless torque measuring instrument,the torsional vibration frequency of the wheelset was measured under the condition of saturated adhesion,and the results were compared with the finite element simulation results of the wheelset.At the same time,the wheel-rail contact surface was sprayed with water to obtain the adhesion characteristic curve.The experimental results show that,under the driving condition,idling and skidding of the wheel will stimulate the vibration of the torsional natural vibration frequency of the wheelset system;according to the transient output response time and control accuracy of the control system,the fuzzy PI control is better than the other two control strategies;adhesion characteristic curve obtained from different adhesion state tests reflects that the creep force of wheel-rail increases gradually with the increase of creep rate until saturation.