Study On Automatic Leveling Control System Of Large Heavy-load Platform

Along with the revitalization of China's equipment manufacturing industry, such as heavy equipment transport platform, a large drilling rig, heavy cranes, heavy weapons, launch platforms and other large platforms, the research of Auto-leveling technology is imperative. This paper uses electro-hydraulic proportional control technology platform within the precision rapid and stable leveling. It mostly includes following studies.First of all, it describes the system's composition and working principle,provides the overall program, including the platform's structure, the control mode and the transmission mode, and the main hardware systems that involve selection, and then gives the main parameters to complete all aspects of the match. At the same time, according to the characteristics of the system,the platform model and the installation of angle sensor characteristics, combining with common leveling methods and control algorithms, it decides to select only-rise method.Secondly, as the single-leg electro-hydraulic proportional valve hydraulic system, firstly as the hardware parameters it receives the leg electro-hydraulic proportional control system transfer function, then makes stability analysis, and then regulates the instability system with Double T network, while the conventional PID control strategy is inappropriate; finally it decides to adopt intelligent PID control technology. It designs a fuzzy PID controller, gives fuzzy control rules, and provides input and output characteristics graphs, in order to pave the way behind the platform'simulation.Finally, based on simulink of Matlab , it compares conventional PID and fuzzy PID simulation of single-leg electro-hydraulic proportional control system, through contrast, there proves that fuzzy PID not only can quickly reach leveling, and can effectively restrain the oscillation. The whole simulation for the entire platform, including the simulation module design of "empty legs" to determine, shows fuzzy PID control strategy significantly improving system performance. Based on Siemens PLC, this paper designs the whole auto-leveling system software, and part of the procedures passes inspection.