The Research Of Suspended Access Platform Automatic Leveling System Based On Fuzzy PID

With the development of construction industry in urban and rural areas of China, the suspended access platform has been one of the important construction machinery in the modern industrial and civil building construction process. The workers control the platform and work in the suspending platform, which is high-risk operation. The linear velocity of different suspended access platform rope position may be different because of rotating speed difference or machining accuracy or transmission error of the hoisters, which leads to the suspended access platform not level. This situation is not good and it may cause major accident.The major leveling method include manual level and auto level. Manual level in high altitude is dangerous and difficult.The present situation for the use of the suspended access platform is that the operator lacks the security protect awareness, in the excessive pursuit of efficiency and speed, when the actual loading is more than the rated load the case for continuing to use the suspended access platform still happen sometimes, which bring many safety risk. Aiming at the situation, this paper designsa auto leveling control system of suspended access platform based on PIC16F877a MCU.this system put forward a new adaptive fuzzy PID control leveling algorithm by fuzzy PID theory and choose the same directionchasing as the level strategy.This paper research the fuzzy control theory of the modern control theory and put forward the fuzzy PID control theory by combine fuzzy control theory and PID control theory. First, this paper puts forward a new suspended access platform fuzzy PID control leveling algorithm based on MATLAB aiming at the structure and running characteristic of suspended access platform. This paper sets themembership function, fuzzy rulers and precision function. Second, simulate the fuzzy PID control leveling algorithm in the SIMULINK environment of MATLAB, and add a traditional pure PID control leveling algorithm model as comparison. The simulation result verified the fuzzy PID leveling algorithm’s accuracy, speediness and anti-jam capabilities are better than a traditional pure PID control leveling algorithm.This paper designs the hardware and software of the leveling control system. In the part of hardware design, first, this paper researches the technical specificationsand technical specifications of the system, and determines the key parts such as controller unit, angle detection units and converter units; Next, according to the control system design requirements and the selected controller, tospecifically determine all electric circuitelements what will be used in the control system, dwell on the child-module of hardware, working principle and principle circuit diagram of the child-module.Finally draw the system principle diagram and make the PCB board by using ALTIUM DESIGNER. The system uses C as the programming language, and writes in the MPLAB development environment. The system soft design principle is structured and modularized. Software is divided into several independent function modules. The data structure in module is closer and the data structure of different modules areloose, which can reduce interference between modules.Finally, to give the system main program flow, the system basic program framework, describe the specific steps and realization processes of software programming in detail.