Research On Control Technology Of Hybrid Driven 3D Elliptical Vibration Cutting System

Elliptical Vibration Cutting(EVC),as a precision machining technology,has been extensively used in the aerospace,military,and civil industries.Up to date,the research of3 D EVC technology has mainly involved in device design,processing performance,path planning,etc.,but less research has been done on the control technology of 3D EVC systems.However,EVC requires precision control in order to obtain the best machining performance during precision machining,it is necessary to develop a complete control system to achieve it.This paper conducts some research work on the control technology of3 D EVC system.The main research contents are as follows:1)An Improved Algorithm for Identifying 3D EVC SystemThe nonlinear Wiener system model is established for the 3D EVC device,and based on the above-related research on algorithm improvement,the adaptive step-size glowworm swarm optimization algorithm(IASGSO)is used to adjust the step-size according to the distance of the global optimum,and the 3D EVC nonlinear Wiener system model parameters are identified.The performance of glowworm swarm optimization(GSO)algorithm and IASGSO algorithm is compared by two standard test functions,and the system identification experiment is used to collect experimental data to verify the global search ability of IASGSO.2)An improvement of Robust Adaptive Fuzzy Controller for 3D EVC SystemAn improvement of robust adaptive fuzzy controller based on Dynamic Surface Control(DSC)method is proposed for generalized single-input single-output(SISO)uncertain nonlinear systems.The T-S fuzzy logic system is used to approximate the uncertain nonlinear function with unknown structure in the system,and the stability of the system is analyzed with the help of Lyapunov method.The controller parameters are tuned,and the effect of parameter changes on the stability of the system is compared by the system response curve.Finally,the designed robust adaptive fuzzy controller is applied to the system model of a three-dimensional elliptical vibration cutting device.The validity of the proposed method is verified by MATLAB simulation analysis.3)Carried Out a 3D EVC Control System Experimental Platform for Cutting Experiments After programming the robust adaptive fuzzy controller using Lab VIEW system design software,the closed-loop test of the three-dimensional elliptical vibration assisted cutting control system was performed with the NI c RIO-9033 controller to verify the robustness of the robust adaptive fuzzy controller.Set up a three-dimensional elliptical vibration-assisted cutting machining experimental platform,and perform cutting experiments on copper and titanium alloy(Ti6A14V)with high strength and toughness.The surface topography of the processed workpiece was observed by ZYGO white light interferometer,and the machining accuracy of the two cutting methods was analyzed,in order to effectively verify the feasibility of the robust adaptive fuzzy controller.