Research On PLC-based Control Of Electro-hydraulic Servo Stable Platform

Considering some requirements of the engineering project, a stable platform needs to be designed to isolate the carrier and the object equipped on it. Especially in some certain conditions, the structure of the platform has more different with other ordinary platform. This paper introduces one electro-hydraulic servo stable platform and brings forward a series control strategies and algorithms by system modeling and simulating. Experiment results prove that the complex control which contains improved PID control and feed-forward control has a good control performance .Further more, considering the nonlinear, time-variation characteristic of the stable platform system, design the Fuzzy-PID double model control algorithm , accordingly meet the requirements of the system better.In chapter 1, first introduce the basic concept, structure ,principle , application, development and the research status of the stable platform ,then introduce the development, application, advantage and disadvantage of the electro-hydraulic servo control technology ,and the development, application, characteristic of PLC. Finally bring forward the research content and research method of the project.In chapter 2, introduce the structure of the platform, include the structure of actuating mechanism, the structure of electro-hydraulic servo driven system and control system of the platform, analyze the working principles and characteristics of all united parts, in order to construct the system modelIn chapter 3 ,construct the model of valve-control parallel asymmetry cylinders, analyze the characteristics and control performances of the model.In chapter 4, based on the analysis of the system mathematic model, bring forward the PID control of stable platform, the improve the PID control and add the concept of the feedforward, form the complex control which contains improved PID control and feed-forward control, with simulation and experiment on it, obtain the correspond conclusion.In chapter 5,considering the nonlinear, time-variation characteristic of the stable platform ,bring forward the Fuzzy-PID double model control theory, do some analysis and simulation researchIn chapter 6, sum up the whole paper, and explain some objects need to be further researched in order to guide the next step work...