High-speed train cooperativecontrol based on fractional-ordersliding mode adaptive algorithm

Purpose–This study aims to propose an adaptive fractional-order sliding mode controller to solve the problem of train speed tracking control and position interval control under disturbance environment in moving block system,so as to improve the tracking efficiency and collision avoidance performance.Design/methodology/approach–The mathematical model of information interaction between trains is established based on algebraic graph theory,so that the train can obtain the state information of adjacent trains,and then realize the distributed cooperative control of each train.In the controller design,the sliding mode control and fractional calculus are combined to avoid the discontinuous switching phenomenon,so as to suppress the chattering of sliding mode control,and a parameter adaptive law is constructed to approximate the time-varying operating resistance coefficient.Findings–The simulation results show that compared with proportional integral derivative(PID)control and ordinary sliding mode control,the control accuracy of the proposed algorithm in terms of speed is,respectively,improved by 25%and 75%.The error frequency and fluctuation range of the proposed algorithm are reduced in the position error control,the error value tends to 0,and the operation trend tends to be consistent.Therefore,the control method can improve the control accuracy of the system and prove that it has strong immunity.Originality/value–The algorithm can reduce the influence of external interference in the actual operating environment,realize efficient and stable tracking of trains,and ensure the safety of train control.

Discussion and Practice of Blended Teaching in Basic Theory and Application of GSM-R

In order to accommodate the trend of high-speed railway signaling integrating with communication techniques,Basic Theory and Application of GSM-R is a crucial curriculum for students majoring in Traffic Information Engineering and Control and Transportation Engineering.It helps students to master the latest theory and application of train-ground communication techniques.However,with the application of the next generation railway mobile communication technique,several advanced communication techniques are presented in the form of English materials.It is of great significance to have a bilingual teaching mode for this course.This would contribute to cultivating research-oriented and professional talents with international competitiveness.Through the blended teaching reform of bilingual education,the proportion of topic selection of interdisciplinary research papers by postgraduates has increased from 6%to 15%.In this article,the characteristics and the current problems of bilingual teaching are discussed from theory to practice in three aspects:the production of bilingual courseware,the supplement of English materials,and the guidance of research topics.Additionally,corresponding teaching reform schemes are proposed in this article.