Research On Hybrid Damping Semiactive Control Of High-speed Train Based On Horizontal-vertical Coupling Model

At present,high-speed trains operating in China mainly adopt passive suspension system,which has poor adaptability to the changes of their own parameters and service environment,and has gradually been difficult to meet the actual operation requirements of running at higher speed and on different lines.The semi-active suspension control system can overcome the limitations of the passive suspension system,improve the vibration response characteristics of the vehicle system,and improve the ride quality of the train.However,most of the current research on semi-active control of railway vehicles completely separates the vehicle lateral model and vertical model,without considering the vibration control effect under the coupling of the two.Some control methods are difficult to take into account the suppression of low-frequency and middle-high-frequency vibration of the carbody.In addition,there is little research on modal coupling vibration of the carbody.Therefore,a multi-rigid-body horizontal-vertical coupling dynamic model of a high-speed train was established,the dynamic performance of the model under different operating conditions was analyzed,and the semi-active control strategies based on the model were studied to improve the lateral and vertical ride quality of the vehicle system.The main research contents and conclusions are listed below.1.A multi-rigid-body horizontal-vertical coupling simplified physical model considering both the lateral and vertical random vibration of high-speed trains was established.Based on the simplified model,the differential equations of motion of the main components and the state space model of the vehicle system were established.Based on the simplified physical model and referring to the parameter data of CRH380 X high-speed train,a high-speed train dynamics simulation model considering the nonlinear characteristics was established by using Simpack,and the correctness of the model was verified.2.Based on the frequency domain method,the time domain samples of ballastless track spectrum of Chinese high-speed railway were numerically simulated,and the differences of track irregularity amplitude between them and the measured line data were compared.The changes of vehicle ride quality and safety under different running speeds,line conditions and curve radii were studied and analyzed.The results show that the lateral vibration of the vehicle is more severe than the vertical vibration under different operating conditions,and the dynamic performance of the train will deteriorate evidently under the conditions of higher running speed,larger amplitude of track irregularity and smaller curve radius.3.A co-simulation model based on Simpack/Simulink was established,and the correctness of the model was verified.The control effects of on-off and continuous algorithms for skyhook control and inertial damper skyhook control were studied,and the influence of key parameters in continuous algorithm on the control effect was analyzed.By introducing the switching function of the control algorithm,a hybrid damping skyhook control strategy was designed,which uses inertial damper skyhook control to suppress the middle-high-frequency vibration of the carbody,and uses skyhook control to improve the low-frequency vibration performance.The simulation results show that the control strategy can suppress the lateral and vertical vibration of the carbody in a wide frequency range,and can effectively improve the ride quality of the vehicle under different operating conditions without causing safety problems.4.The suspension modal parameters of the dynamic model and the relationship between the synthetic vibration of the carbody and the suspension mode were analyzed.The skyhook damping modal control strategy based on modal control and skyhook control was studied.By introducing the hybrid damping coefficient and weighting function to adjust the control proportion of each modal vibration,a mixed damping modal control strategy was designed.The influence of key parameters in the control algorithm on the control performance was analyzed.The simulation results show that the control strategy can effectively suppress the modal vibration of the carbody,thereby reducing the lateral and vertical vibrations of various parts of the carbody and improving the ride quality of the vehicle.Meanwhile,the control strategy can effectively improve the ride quality of the vehicle under different speed levels and line conditions without causing safety problems.