Research On Structure Parameters Design Optimization Of High Speed Pantograph

The steady contact between pantograph and the catenary is vital for the safe operation of high-speed trains in the process of high-speed railways.If the contact is poor,or the pantograph is damaged,the power supply capacity of the pantograph-catenary system will be directly reduced,which can affect the operation safety of the high-speed train.The structural parameters are the key factors in improving the high-speed pantograph performance,which can ensure the safety and reliability of trains.In order to obtain a high-performance pantograph and a stable dynamic current-collection,the design optimization models of the high-speed pantograph are established.With the methods of the integrated design and the collaborative optimization,the whole structure of the pantograph will be studied.First of all,the main design factors that influence the working performance of high-speed pantographs are analyzed.Based on the multidisciplinary design optimization,the design problem of the pantograph is divided into four disciplines which are the kinematics,the statics,the dynamics and the control.Then,the design optimization objectives of the four disciplines are derived from the numerical analysis of the design parameters.Finally,the disciplinary optimization models of the pantograph are established in terms of the design optimization problems.Secondly,based on the idea of integrated design,the integrated design model of highspeed pantograph is built by the linear weighted sum method.With a method of the genetic algorithm,the optimized results of high-speed pantograph structural parameters are acquired.Compared with previous optimization design,the change of high-speed pantograph movement trajectory is discussesed,and the variation of the pantograph-catenary contact force is investigated.According to the simulation results and theoretical analysis,the effects of the active control strategy on the working performance of the pantograph are verified.Using the finite element analysis,the overall structure of the pantograph and its mechanical components are simulated and analyzed to insure the reliability of the pantograph structure.Finally,considering the interaction and coupling variables of different disciplines,the collaborative optimization is adopted to establish the optimization model of the pantograph.The influence of the interdisciplinary coupling variables is analyzed,and the simulation calculation of the pantograph-catenary system is executed.The variation of the dynamic equivalent parameters is acquired,and the PD control strategy is used to design an optimal PD controller of the contact force.At last,a three-dimensional model of the pantograph is constructed to verify the validity of multidisciplinary design optimization results.The results show that the multidisciplinary collaborative design not only satisfies the design requirements of the system and subsystems,but also obtains the overall optimal solution of the pantograph,which enhances the performance of the pantograph and improves the current collection quality of the pantograph and catenary.