Study On Electro-hydraulic Servo Fuzzy Control Systems Of Hydraulic Cylinder Assembling Specialized Equipment

With the development of engineering mechanical industry, the hydraulic cylinder, as an important matching part, is enhanced in quantity and quality. So its old assembling methods and equipments can not satisfy the market requirement.In the assembling process of hydraulic cylinders, the key and nodus to ensure the seal capability and boost the productivity is to seek the centre line of the cylinder and the piston pole rapidly. To resolve the problem, according as assembling demands of the hydraulic cylinder, new special assembling equipment is investigated in this thesis. It adopts the self-centering and clamping organization, which hydraulic motor driving a combination of one gear and two racks to make two V-shaped slides centered synchronously to ensure seeking the centre line of the cylinder and the piston pole rapidly at the Y direction. On the other hand, the electro-hydraulic servo systems is designed, which math model is built and predigested, using fuzzy control, to adjust the exact place of the controlled hydraulic cylinder at the Z direction quickly, as so to seek the centre line of the cylinder and the piston pole rapidly.The electro-hydraulic servo fuzzy control systems are studied on the electro-hydraulic servo valve and the hydraulic cylinder as the driving device, which is the controlled object. For characters of the system such as time-variable, nonlinear and no accurate math model, Controllers are designed, such as the routine fuzzy controller, the self-adapting fuzzy PID controller and the model reference self- adapting fuzzy controller. Then, the systems are simulated and analyzed with various damping ratios and disturbances through Matlab7.0, proving the self-adapting fuzzy controllers are better than the general PID controller and fuzzy controller in dynamic characteristics, static characteristics and robustness. At last, experiments prove that the model reference self- adapting fuzzy controller is effective, satisfies the using needs of the assembling equipment of hydraulic cylinder, and provides credibility for the model machine manufacture.The research on the special assembling equipment of hydraulic cylinder and the electro-hydraulic servo fuzzy control systems has practical meaning and theoretic value, resolving the bottle-neck problem that restricts the hydraulic cylinder's product. Inducing, the factories can enhance the quality of product and the productivity, reduce the fault ratio and the after-service charge, debase work-labor intension, and increase the product competition in its own profession.