Electromechanical Co-simulation And Contour Error Control For Aero Engine Blade Repair Welding Machine

Improving the structural performance of aero engine blade welding machine and welding precision are priorities of the research about blade-repairing because of the curved shape of blades and critical welding quality requirements. In order to improve the accuracy of processing, statics, dynamics performance, servo control system as well as the processing path contour error were studied in this paper.Designed the machine according to the requirements of the processing, analyzed its static and dynamic properties. Refined machine structure against defects and improved the structural stiffness and natural frequency. Considering the effect of ball screws and translational components' torsion, stretching vibration and the vibration of servo motors, ball screws and slides were made flexible, in order to establish a rigid-flexible coupling virtual prototypes which is more reliable.Servo control system model of machine was established in Simulink, and the current loop, velocity loop, position loop parameters were tuned, so that the servo control system is good dynamic performing. Then a co-simulation platform was established by docking control system model and rigid-flexible coupling dynamics model. interpolation algorithm was realized by using Matlab language, the three part were combined to build a electromechanical virtual prototype contains CNC, servo drives, mechanical drive modules which can test weld machine kinematics, dynamics, servo system and analyze the contour error.A variable gain cross-coupled control method of making contour error be approximated by linear contour error vector can be directly extended to multi-axis motion system was proposed.