Principle Design And Dynamic Characteristics Of Semi-active Control Anti-snake Yaw Damper

Yaw damper is one of the key suspension components of locomotive to improve operation stability and the critical speed of vehicle snaking motion.On straight track lines,Hight-speed vehicle needs a great number of damping force provided by anti-hunting yaw damper,which improve Vehicle dynamics performance,then on curved track lines,it needs smaller damping force to pass the curves smoothly.Therefore,this thesis takes the semi-active control yaw damper with two damping systems as the research object.Firstly,the structure and principle of the traditional yaw damper are analyzed in this thesis,and a set of electromagnetic value is added to the outer cylinder seat of the yaw damper.changing the oil path through power cut and electrification,The design schemes of semi-active yaw damper with two damping are completed.When the solenoid valve is powered off,the anti-snaking yaw damper outputs large damping force,while when the solenoid valve is powered on,it outputs small damping force.AMESim software was used to establish hydraulic simulation model of yaw damper to analyze its mechanical characteristics;speed control strategy was used.Secondly,the correctness and precision of the hydraulic simulation model is verified by bench test of yaw damper.The mechanical model of yaw damper can well describe the flow characteristics of hydraulic oil in the yaw damper cavity and the motion law of the components in the valve system of yaw damper,by comparing the results of bench test with the results of hydraulic simulation model of yaw damper,the results of hydraulic simulation model fit perfectly the results of bench test,which shows that the hydraulic simulation model has higher simulation precision.Finally,the vehicle dynamics model is established by using SIMPACK,and the joint simulation model is established and analyzed by Simpack/Simulink/AMESim joint simulation method to study the dynamic performance of semi-active anti-snake yaw damper under straight line condition and different curve radius condition is studied.The results show that the semi-active control anti-snake yaw damper meets the standard requirements when the solenoid valve is disconnected under the straight line condition,and the curve passing safety is better after the solenoid valve is opened under the curve condition.The dynamic performance of the linear line of the traditional passive anti-snake yaw damper with large damping is better,but on the curve line it is poor,while the dynamic performance of the linear line of the traditional passive anti-snake yaw damper with small damping is poor and the dynamic performance on the curve line is better.The semi-active anti-snake yaw damper can ensure the dynamic performance of the vehicle on the linear line and curve line.