Research Of Hydraulic Servo Tracking System Based On Visual Sensor For Two-dimensional Curve

As the manufacturing industry becomes increasingly intelligentized, automatic control technology assumes more and more importance in equipment manufacturing industry, thus putting higher and higher demands on position-tracking automatic control technology in real time, high response, high precision, etc. The motor-servo position-tracking system has been in fairly wide use in the traditional position-tracking automatic control system for being, among other things, easy to install, light and flexible. However, the advantages of hydraulic servo driving are highlighted in light of the trend for high response and high precision.The major work of this project has been to carry out theoretical analyses of the extraction and processing of curve position based on visual sensing technology, and on the basis of which to study the hydraulic servo 2D curve tracking system, thereby providing the theoretical foundation for the design of 2D curve tracking platform.Firstly, a design of hydraulic servo 2D curve tracking system was created by merging visual image processing technology and hydraulic servo control technology, a theory of visual detection and image processing technology expounded, and a method of extracting information concerning 2D curve position established. Secondly, a linearized analysis of hydraulic servo system was made, a simplified model established based on the transfer function, and a design of the hydraulic power mechanisms created according to the system design requirements based on the analysis of performance parameters of hydraulic system. And in the Simulink simulation environment, the unadjusted system simulation model was established and simulation analysis ensued. Then, based on the mathematical model of hydraulic servo system, to improve the tracking precision of high frequency input signal and reduce the time delay, a composite control system that combines PID and velocity and acceleration feedback tuning, together with input feedforward compensation has been chosen. A Simulink simulation model of hydraulic servo 2D tracking system with composite control was established and the adjusting and optimizing of the tuning parameters helped the hydraulic 2D tracking system to yield good control effect and meet the system design requirements.