The Research Of Control Of Closed Hydraulic System Synchronous Dual-hoist Based On Fuzzy PID Control

Crane is a common construction machinery in engineering machinery. With the electricity, petroleum, chemical industry develop strongly, as the crane larger-tonnage and larger tonnage, requirements of the accuracy and dynamic performance is stricter and stricter. In order to increase the tonnage and lifting load factor of safety, large tonnage and extra-heavy load lifting crane dual-hoist system has been widely used single-hook hanging set, which is double hoist synchronization requirements have become more sophisticated, using the traditional PID control double hoist synchronization can not meet the system accuracy and dynamic performance requirements. Fuzzy logic is used for PID control, whose parameters can be adjusted automatically according to error and error changing. A comparison analysis between PID and Fuzzy PID control is carried with the help of MATLAB/AMESim software to establish two-hoist control systems and hydraulic models, through the co-simulation model to verify the fuzzy PID control method for simultaneous dual-hoist control system has better control effect. The main contents of this thesis are as follows:(1) Summary of large-tonnage cranes dual-hoist system characteristics and composition, A closed hydraulic test platforms is designed, including hydraulic system and electrical system design, and components are selected for it.(2) The closed hydraulic system stability analysis. Using transfer function method to establish the closed hydraulic test platform synchronized dual-winch control system mathematical model. And the bode diagram is draw. Using time-domain analysis and frequency domain analysis method to analyze the system stability and dynamic response.(3) Design of fuzzy PID controller. In-depth study of fuzzy PID controller and fuzzy PID parameter tuning rules. Design double-hoist synchronization control system in MATLAB fuzzy PID controller and the Fuzzy module is implemented in MATLAB/Simulink in system simulation, A comparison analysis between PID and Fuzzy PID were carried with the help of Simulink. The simulation results showed that the fuzzy PID has better effects than traditional PID.(4) Co-simulation of MATLAB/Simulink and AMESim, Using MATLAB/Simulink to create a fuzzy control controller, built hydraulic system in AMESim, to achieve a co-simulation The results show that the fuzzy PID control strategy has better control effects and robustness in A closed hydraulic test platforms.