Dynamic Performance Simulation And Optimization Of Machine Tool Based On Electromechanical Coupling

The dynamic performance of machine tool is based on the integration of the subsystems.The operational process of machine tool has complicated electromechanical coupling interactions.Both mechanical structure and servo system have an influence on the dynamic performance of machine tool and further influence the machinability.In the design process of the machine tool,besides the influence of structural parameters of machine tool on static and dynamic performance,the coupling influence of mechanical structure and servo system on dynamic performance should be taken into consideration.To solve these above problems,the dynamic performance analysis and optimization method of machine tool are systemically studied based on electromechanical coupling model by means of modal order reduction theory and centralized parameter method.This method can be applied for the parameter optimization of mechanical structure and servo system,which can improve the dynamic performance of machine tool in the schematic design stage.The main work is as follow:Under the basis of systematical analysis on influence factors of dynamic performance of machine tool,the optimization method of dynamic performance of machine tool based on electromechanical coupling is proposed with response surface methodology and multi-objective optimization algorithm,and the optimization technique process is formed.The rigid-flexible and electromechanical coupling model of machine tool is built based on the modal order reduction theory,centralized parameter method and PID control model.The simulation and experiment are performed on an test platform of feed system.And the feasibility of electromechanical coupling model is verified.Based on the electromechanical coupling dynamic simulation and optimization method,two high precision horizontal machining center are studied in this thesis.The single axis and multi-axis dynamic simulation and optimization are conducted.The results indicate that the axial positioning accuracy and response efficiency of each axis are raised slightly and the axial vibration amplitude is reduced obviously.The dynamic performance of machine tool is improved remarkably.