Research On Force And Deformation Simulation System Of Catenary Wrist Arm Based On CAD/CAE Integration

The catenary system is an important component of the traction power supply system of the electrified railway.As a part of the catenary,the wrist arm device supports and fixes the contact suspension and bears its load.The current wrist arm pre-configuration lacks model guidance,and the wrist arm deforms after being stressed,which affects the position of the contact suspension space.Therefore,establishing a digital model of the wrist-arm system and studying the deformation law of the wrist-arm after being subjected to force are of great significance to the overall integration of the catenary system into the digital system,the improvement of the wrist arm pre-configuration accuracy,and the support of refined construction.In this paper,the elements of the wrist arm are firstly analyzed and divided into design parameters,measurement parameters,component parameters and assembly rule parameters.After these parameters are defined,the contact suspension position and the inclination of the pillar are used as boundary conditions,and the flat wrist is derived in turn.The position coordinates of the arm,oblique wrist arm,positioner,positioning tube,support and pull wire are introduced and the deflection angle is introduced to convert the two-dimensional coordinates into three-dimensional,and construct a mathematical model of the wrist and arm.Then import the mathematical model of the wrist and arm into ANSYS APDL,define the material parameters and establish a parametric wrist-arm static model.After reasonably applying constraints and target loads,the finite element method is used to carry out a static analysis of the model,and finally the deformation diagram before and after the force and the curve of the deformation of the key points such as the end of the flat wrist arm as a function of the load of the wrist and arm are generated.After substituting a set of parameters according to the standard,the positive and negative positioning wrist-arm models are established,and the finite element method is used for static analysis.The maximum deformation of the arm occurs at the wrist-arm support connection,and the deformation of each key point is positively correlated with the load.Finally,a fully parameterized wrist arm force and deformation simulation system is established by using MATLAB GUI,The system can be used to verify and correct the actual wrist-arm preconfiguration results on site,and provide tool guidance for improving the wrist-arm preconfiguration accuracy.Next,loads of different sizes were applied to the actual wrist arm,a high-speed camera was used to collect the spatial positions of the key points of the wrist arm and the deformation variables were calculated.Then the calculation under the same working conditions was performed in the simulation system.After comparing the experimental data and the simulation results,the trend was changing Consistent with the above,the reliability of the simulation system was verified.Using the wrist-arm force deformation simulation system to study different wrist-arm angles,it is concluded that the deformation of the flat wrist-arm increases with the higher the head-up angle,and is higher than the horizontal situation.The overall change of variables is not large,and the deformation of the wrist arm is lower than or close to the horizontal;the angle of the oblique arm arm is inversely proportional to the deformation,but if the angle is too large,the deformation of the positioning ring installation will be too large.According to the above rules,the suggestions for installation of wrist arm are proposed When installing the flat wrist arm,the head can be lowered by 0～5°.When installing the inclined wrist arm,the angle can be slightly increased by 0～5° on the basis of the standard 31.5°,which can effectively reduce the deformation of the wrist arm after stress.