Modelling And Development Of Simulation Software Of Rolling Mill Bending Roller Control System

The study of china's iron and steel enterprises on shape control starts at a late stage. Moreover, most equipment is introduced in complete sets so the in-depth study on equipment designing is relatively rare. As for the design of bended hydraulic system, we usually adopt the analog foreign design, however, analog design has many flaws,being short of theoretical designing basis, there exists many problems in the practical application. In view of this, Baosteel Group Technology Center has commissioned to Northeastern University to undertake the research topic,in purpose of using simulation methods to solve designing problems about bended hydraulic system. So as to identify the designing ideas and mechanism to provide adequate theoretical basis and technical support to China-made equipmentThe object of this topic is Northeastern University rolling mill automation technology and State Key Laboratory of 300 quadratmeter four-high rolling mill roller bending hydraulic system. First of all, through consulting on the mass literature to understand the control principle and control method of bending method control panel, and research on the actual equipment to learn on the bending of the hardware structure of the hydraulic sy stem to have a full recognition and understanding. Then analysis hydraulic schematic diagram, based on a comprehensive understanding of the hydraulic control system for roller bending, hydraulic servo system modeling and simulation theory to study modeling methods of the bending of the hydraulic control system and implementation methods of the model. The more realistic mathematical which can be established by reasonable simplification of the system model, can not only accurately reflect the dynamic characteristics of the system, but also provide a theoretical basis of obtaining accurate parameters. At the same time, in the modeling process also consider a lot of non-linear factors, which are usually simplified and neglected. when comes to realization of the model, this essay makes good use of modern simulation technology and software, uses dynamic structure of Matlab in Simulink software ofdynamic structure to realize system simulation, and the dynamic structure is one-to-one with the mathematical model. This way of model realization can be realized in Simulink and run the simulation only needs to set up block diagram of the model. As to the ascertainment of system parameters, the essay have breadboard measured on the hydraulic oil equivalent elastic modulus and the equivalent volume hose elastic modulus, while some others in accordance with actual equipment drawings of the original structure, such as oil cylinder effective area, piston rod travel param eters. Still others come from calculation, such as the equivalent stiffness, and relevant literature. Run through the simulation in Simulink, has obtained the simulation curve of main control volume and analysised effects of the servo valve natural frequency and bending of the effective area of the fuel tank on control system. And then use the function of Matlab's GUI to make up a visual simulation software, which can provide significan tools for analysis and design for technicians worked on related project. Finally, in order to verify the accuracy of theoretical models, this article has done a system identification experiments on the actual system prior to the servo valve and hydraulic sensors to do the transformation.