Research On Semi-active Control Simulation And Hardware-in-the-Loop Test Of Railway Vehicle Suspension System

The passive suspension system of traditional railway vehicles is optimized and designed based on the comprehensive parameters of standard wheel and rail profiles.During operation,its damping characteristics cannot be changed in real time and cannot adapt to changes in external conditions.When the train’s operating conditions,line conditions,wheel and rail wear change,and the parameters of the passive suspension system cannot be adapted,the dynamic performance of the train will deteriorate.In addition,as the operating mileage continues to increase,the performance of the passive suspension system itself will also deteriorate,causing the dynamic performance of the train to deteriorate.Therefore,in order to improve the running quality of high-speed trains,it is urgent to design a suspension system that can adapt to changes in external conditions.The semi-active suspension system has the advantages of less energy consumption,simple control,and good safety of control failure guidance,etc.,making it possible to solve this problem.This paper focuses on the semi-active control simulation and hardware-in-the-loop test research of the second series lateral shock absorber of the railway vehicle suspension system to improve the stability of the vehicle and improve the running quality of the vehicle.The main research contents of the paper are as follows:(1)First of all,the control effect of passive control,Sky-hook(SH)control and Acceleration driven damper(ADD)control is compared and analyzed with quarter-vehicle model as the research object and the approximate transmission rate of the nonlinear system as the evaluation index.Based on the linear continuous SH control strategy and the linear continuous ADD control strategy,a new semi-active control strategy,linear continuous Mixed SH-ADD,is proposed.Through simulation and comparison analysis,the results show that the linear continuous mixed SH-ADD control strategy performs better in the full frequency range,and its control effect is better than the switched mixed SH-ADD control.(2)Then,a high-speed EMU model is established,and the reliability of the model is verified through dynamic simulation.Comparative simulation analysis of the switch-type and linear continuous Mixed SH-ADD control on vehicle running stability and safety,the results show that: semi-active control can greatly improve vehicle running stability,the proposed linear continuous Mixed SH-ADD control It has better performance in improving vehicle running stability.(3)Furthermore,using hardware-in-the-loop simulation technology,a hardware-in-the-loop test system for railway vehicle suspension system was constructed,and its reliability was tested and verified from three aspects.The hardware-in-the-loop simulation test was carried out under the two conditions of single frequency excitation and German low interference spectrum track irregularity excitation.The test results show that the semi-active control of the secondary damper of the railway vehicle can greatly reduce the lateral vibration acceleration of the car body.Improve the stability of the vehicle;the proposed linear continuous Mixed SH-ADD control strategy can significantly reduce the lateral vibration acceleration of the vehicle body and improve the lateral stability of the vehicle on the basis of the switching control strategy.