High-Speed Train Suspension Based On Sliding Mode Variable Structure Research On Control Methods

China’s high-speed rail is an important business card for our country to go to the world,and it has gradually become an important means of transportation for the Chinese people to travel at long and medium distances.This requires that the control of stable operation of high-speed trains needs to meet more and more performance indicators.High-speed train suspension control algorithm is the key technology of high-speed train operation control system.Therefore,the semi-active suspension control algorithm of high-speed trains has become a research hotspot in the field of transportation due to its high energy efficiency.The high-speed train model has the characteristics of non-linearity,strong coupling,and multiple degrees of freedom,which poses severe challenges to the modeling work,and there are random disturbances caused by horizontal irregularities of the track surface and irregular directions during the operation,which is extremely It affects the stable operation of the train.To this end,this paper combines the sliding mode control theory and finite time control theory to design a high-performance,strong robustness and finite time convergence high-speed train semi-active suspension controller.The specific research contents are as follows:1.For the mechanical analysis based on the physical characteristics of high-speed trains,the spring coefficients,damping coefficients,and mass coefficient matrices of the trains are revised,and the revised mathematical model of the high-speed trains is obtained.The five-level line spectrum is used to simulate the track movement of the trains.Random irregular input signals,combined with the random vibrations encountered during the operation of high-speed trains,using Simulink simulation,built a 17-degree-of-freedom lateral semi-active suspension system model for high-speed trains.2.Aiming at the problem of increased lateral vibration of high-speed trains caused by railway track surface vibration,a control algorithm for high-speed train lateral semi-active suspension based on sliding mode observer is proposed.An observer based on sliding mode variable structure is designed,and a real-time estimation method for unknown interference items is obtained,and then the observation value of unknown interference items is calculated;by designing a control algorithm based on sliding mode observer,the unknown interference observation value is input as feedback to the sliding Mode controller,so as to reduce vibration.The simulation and experimental verification prove the feasibility and effectiveness of the proposed algorithm.3.Design the sliding mode gain adaptive observer for the situation where the upper bound of the actual high-speed train’s actual disturbance is unknown;then,using the obtained disturbance estimate and the power integration method combined with the sliding mode controller,establish a train in a limited time A control algorithm for tracking a given signal is implemented internally.Theoretical analysis shows that the proposed algorithm can ensure that the train can operate safely within a limited time.Finally,simulation experiments verify the effectiveness of the proposed power-integral sliding mode control algorithm.