Research On Control Strategy Of Train Semi-active Suspension System

With the rapid development of high-speed EMUs technology,the comfort level of high-speed EMUs trains has been raised,but the vibration of vehicle running stability and safety of vehicle caused great influence,among them,the train transverse vibration is a major mode of vibration impact on passenger comfort,and closely related to the stability in the process of train.In order to better reduce the vibration of the vehicle body,the method of changing the corresponding parameters of the vibration damping system is generally adopted to cushion the vibration of the vehicle.The vibration damping suspension system is applied to the vehicle body to optimize the stable performance of high-speed EMUs.The train suspension system can be divided into passive suspension,active suspension and semi-active suspension system according to the control principle.As the most adopted vibration reduction system,the semi-active suspension system is an efficient way to reduce body vibration and improve train stability.For damping effect,the semi-active suspension damping system is selected as the target of further research.With the continuous increase of the speed of domestic high-speed EMUs,the vehicle operating conditions and the number of vehicles in the section have undergone tremendous changes,the frequency of the disturbances experienced by the track has increased,resulting in an increase in the speed of train wheel wear,and the optimization of the stability of vehicle operation,which puts forward higher requirements and challenges for the research of vehicle driving stability optimization and vibration reduction technology.Therefore,in view of the operating characteristics of high-speed EMUs,it is necessary to study the suspension control system in depth and propose corresponding vibration control methods for the suspension system.With the help of MATLAB/Simulink simulation analysis software,the model of lateral semi-active suspension system of high-speed EMUs vehicles with 17 degrees of freedom was simulated.The German low disturbance track spectrum was selected as the excitation input,and the time-domain input sample of track irregularity was obtained as the excitation input of the simulation model.Based on the analysis of the commonly used vibration control methods and control algorithms,this thesis selects the combination of adaptive control and fuzzy control to control the transverse semi-active suspension system of trains,and introduces the explicit genetic adaptive fuzzy control strategy to analyze the control effect.The explicit genetic adaptive fuzzy control rules are used to control the train simulation model,the damping device with adjustable damping value is adjusted to achieve the purpose of mitigating vibration,and compared with the traditional fuzzy PID control method.The comparison data includes the maximum value of traverse,roll,shaking and lateral combined acceleration maximum,root mean square value,power spectral density function value and comfort index.The simulation experiment table shows that the control effect of genetic adaptive fuzzy control is better than traditional fuzzy control,showing strong control ability around the human sensitive frequency.