Research On Control Techniques Of Hydraulic Servo System For Variable Vector Propeller

The hydraulic-servo system of the Variable Vector Propeller is Propeller body and is the key unit to ensure the processing precision of system. In this dissertation, the basic theory of hydraulic-servo system is explored further more, and the electro-hydraulic position servo system of the Variable Vector Propeller is researched entirely, combing the theory of modern control and the theory of electro-hydraulic servo control. Research on the mathematical modal of four-connection valve-controlled hydraulic cylinder is done, and the transfer function of four-connection valve-controlled hydraulic cylinder is built. And then, the electro-hydraulic position servo system of propeller under different load is studied by using the method of transfer function and it's dynamic characters.Integrating the development direction of PID control theory, the deep research on some PID arithmetic is done, such as the increased PID control arithmetic, integral divided PID control arithmetic. After that, the choice of the system character and its parameter on the electro-hydraulic position servo system of the Variable Vector Propeller is studied.First, traditional PID control theory is used to control the electro-hydraulic position servo system of the Variable Vector Propeller, And then, the fuzzy PID is further studied to control the electro-hydraulic position servo system of the Variable Vector Propeller. The result shows that we can the fuzzy PID to control the system.