Simulation Analysis And Hardware In The Loop Experimental Study Of Semi-active Control For High-speed Trains Under Wear And Tear Conditions

During the operation of high-speed trains,wheel wear will lead to the deterioration of vehicle dynamics performance.How to keep the vehicle dynamics performance in the process of vehicle operation while ensuring the operating cost is a subject worthy of in-depth study.Studying the dynamic performance changes of trains at different grinding stages,it was found that the change in equivalent taper is significant.In order to maintain good dynamic performance and extend the wheel turning cycle,semi-active control research was conducted on the secondary lateral shock absorber.The research work carried out and relevant conclusions are as follows:(1)Research on the change of vehicle dynamics performance under different operating mileage.Establish a vehicle multi rigid body dynamics model using UM,and simulate wheel wear using the Archard model.The effectiveness of the simulation model was verified by comparing the parameters of the actual measured tracking of worn wheels.The influence of worn wheels on vehicle dynamics at different mileage was studied.The measured data before and after rail grinding are imported into the model,and the influence of rail grinding on vehicle dynamics is analyzed.The results indicate that as the operating mileage increases,various dynamic performance indicators of the vehicle experience varying degrees of degradation;The vehicle dynamics performance has been significantly improved after rail grinding.(2)Research on semi-active suspension under wear and tear conditions.Using the UM Simulink joint simulation method and the UM conditional output variable module,a semi-active control simulation study was conducted on the vehicle model under wear conditions.The smoothness,stability,safety,and wear indicators of the vehicle were analyzed,and the wheel turning cycle under semi-active control was evaluated according to relevant domestic standards.The results showed that semi-active control effectively improved the overall dynamic performance,Although it may lead to a decrease in critical speed,it can extend the wheel turning cycle and reduce operating costs within a certain range.(3)Hardware in the loop experiment and algorithm hardware implementation.We have developed a semi-active controller through programmable controller design and conducted hardware in loop experiments on semi-active control.We compared the control effects of different control strategies using a quarter car model and a seventeen degree of freedom model,and verified the effectiveness of the semi-active control strategy.By setting the equivalent taper of the seventeen degree of freedom model,the influence of semi-active control on the lateral vibration of the vehicle body was analyzed when the equivalent taper was 0.17 and 0.4.