Aircraft Wing Paint Layer Grinding Equipment Control System Design And Implementation

Since the 21 st century,automation technology and equipment have been rapidly developed,and a large number of applications in industrial production practice have automated or semi-automatic grinding equipment.The manual grinding method that has been used for many years is also replaced by an automated grinding method.However,in the field of aircraft manufacturing and maintenance,the grinding of the aircraft's large wing paint layer is still in manual mode.In order to solve the problem of manual grinding of the aircraft wing lacquer layer,this paper studies the control system of the aircraft wing lacquer grinding equipment based on the mechanical design structure.Aiming at the technical difficulties in the process of trajectory control and grinding force control in the grinding process of the large-wing paint layer,a complete set of control system for the large-wing paint grinding equipment of the aircraft was constructed.By analyzing the action mechanism of the grinding process,the force analysis of the single abrasive grain of the sanding paper and the lacquer layer was carried out.Considering several main factors affecting the precision of grinding processing,a strategy for controlling the normal output force of constant grinding is proposed.For the grinding process of the surface of the grinding wheel and the large wing paint layer,the grinding force compensation method Introduced the realization of indirect control of contact force;PLC controller,the control signal transmission flow diagram is established,and the closed-loop transfer function and open-loop transfer function of the system are calculated.The function is a theoretical preparation for the overall design and control simulation of the subsequent control system.By controlling the movement posture of the aircraft's large-wing paint layer grinding equipment,the movement track of the grinding wheel grinding process is adjusted in real time,and the control of the grinding track of the aircraft's large wing paint layer is realized.Based on the establishment of the coordinate system of the aircraft wing paint polishing equipment,the position change and attitude change of the grinding wheel were analyzed,and the static grinding track based on the aircraft structure size was planned.On this basis,a grinding scheme based on dynamic trajectory planning is proposed,which is the Position correction and position compensation of the current machining point of the next machining point.This program is designed to control the adaptive real-time trajectory adjustment process.This scheme aims to advance the unknown grinding path by adjusting the path of the grinding process in real time,and realize the control method of grinding and estimating the trajectory through the fast communication of control.A series of control hardware was used to build the aircraft wing paint layer grinding experiment platform.It is equipped with PLC,stepper drive,stepper motor,electric proportional valve,three-axis force sensor and other hardware systems.The software system is programmed,and online position correction and real-time operation process are designed,and a real-time communication scheme between systems is established.processing of force feedback signalsFinally,the simulation experiment of the grinding equipment control system was carried out by using ADAMS software.According to the relevant data of the lacquer polishing process,the influence of the control parameters on the grinding process was analyzed.The processing method of controlling the feed speed of the lacquer polishing equipment was proposed.The comparison experiment of the grinding force control precision was designed.It was established based on Matlab/Simulink and Simscape modules.The corresponding control model.The steady-state error analysis controlled by the electric proportional valve verified the applicability of the control strategy to the large-wing paint grinding equipment.The simulation results show that the grinding force control is within the allowable range,and the feasibility of the control scheme is comprehensively verified.