Structure Parameters Optimization Design Of High-reach Pantograph

Pantograph is an important part of the pantograph-catenary system, and it has a significant impact on the train running. With the development of railway and increasing of train speed, the existing pantograph cannot meet the properties required in high-reach running environment. Based on the optimization design theory and finite element method theory, the kinematic and dynamic performance was optimized by Matlab optimization toolbox and finite element method (FEM) software MRAC, and it can provide theory and technical support for the design of pantograph.This paper firstly established the pantograph mechanism motion mathematical model and analyzed the kinetic relationship of each bar. The nonlinear vertical kinetic differential equation of pantograph was established by the Lagrange equation and was linearized, and the dynamic model of pantograph was established. Load of each bar was analyzed by Newton-Euler equations, and it can provide the guidance for the design of geometric parameter of pantograph structure.Secondly, the kinetic mathematical model of pantograph was developed in this paper. By considering the technical requirements of locomotive’s stable current collecting for pantograph structure, the optimization target was set as pantograph balancing arm moving in required range and optimization constraint conditions was set that pantograph must meet to work properly. The pantograph structure’s dimension was optimized by Matlab optimization toolbox. The optimal geometric parameters were obtained then.Thirdly, the stiffness and strength of the main bearing parts of pantograph were checked for the reliability of the structure. The3D models of the main parts were established by Solidworks. The stiffness, strength and modal properties of different materials of the main parts were compared and analyzed by using FEM software MRAC.And finally, a coupled FEM model of dynamic contact between pantograph and catenary system was established. The FEM simulation model includes pantograph, catenary and cantilever, objectively reflects the contact state changes between pantograph and catenary system under the loads of high-speed contact and air. The differences between simulation results and test results on spot were in allowed range specified by European Standard EN50318which illustrated the simulation method is feasible and could be applied in simulation of dynamic contact between pantograph and catenary system y in high speed rail way. The influence of different parameters of pantograph on contact force were analyzed based on the pantograph-catenary contact FEM simulation and analysis model. Methods and suggestion to improve the performance of pantograph were raised, and it could provide the guidance and support for further optimization of pantograph structure.