| At today's booming shipping market, China has become the center of the world shipbuilding. The manufacture quality of ship hull Profile is the key to the shipbuilding. But ship hull profile bending machine has many shortcomings at home and abroad, for example:Testing organizations is very complex, machine covers large area, high cost and so on. To solve the above problem, in order to meet the actual needs for small and medium shipyards, our team modified YongHeng Hydraulic Machinery Co. Ltd's YLW-300 bending machine to NC system. As our hull profile bending machine developed, it will promote the production schedule of our shipbuilding enterprises, accelerate the pace of become the world's first shipbuilding power and bring good economic and social benefits.Firstly, this paper compared two kinds of hydraulic bending machine in WenChong and LongXue shipyard. summarized their advantages and disadvantages, analyzed the development of domestic and foreign shipbuilding situation about bending machine, studied relevant research literature at home and abroad, combined the respective advantages of two types of bending machine, raised the solutions for hull profile hydraulic bending machine with other members of our team.Secondly, according to the characteristics of this solution, summarized the shortages of the control system of the other types bending machine in the paper, that the hardware resources and software resources of control system can not be cut, cost high and so on. The paper proposed the control system solution fitting our project that is based on embedded system. Specifically, master controller is based on Samsung's S3C2440A microprocessor, cut the no used hardware, formed the minimum system. Fully analyzed the requirements of the control system in our solution, then designed necessary peripheral control circuits for bending machine, like data acquisition circuit, analog output circuit and so on.Thirdly, used Linux as software development platform, in order to improve the response speed and real-time performance of the system, cut the system kernel, but kept the necessary function for developed the system, removed the needless function in the kernel. Designed the device drivers, these are based on Linux embedded system. Used the QT as graphical user interface development platform, designed the control system interface and the bending machine's apps.Finally, because of hydraulic control system is used in this system, it has nonlinear, dead zones, time-varying parameter and other negative factions, so it is very important to design displacement feedback controller. At first used the classic PID, but the effect no very good, then applied fuzzy parameter adaptive PID control algorithm to simulation, the control performance has been improved. |
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