Application Of Composite Control In Unit Roller's Automatic Jumping Control

Because of the collision between lap of strip steel and unit roller, too big an impact occours during the initial coiling of previous coiler of hot rolling. Based on the real work process of coiler at worksite, an electro-hydraulic servo system including the inner position-adjusting loop and the exterior pressure-adjusting loop is developed in order that unit roller can evite the step automatically. Modern coiler of hot rolling is coiling faster and faster.Based on the physical simulation model built in laboratory ,a series of experiments have been conducted to study how to evite the step even faster and more placidly. The mathematical model of electro-hydraulic servo system is given and the models of unchangeable pressure oil supply and pipes are emphasized. Based on this, the simulation structure of control system with double closed loops is built. Based on the analysis of the fuzzy control principle, this paper presents an fuzzy control method with adaptable coefficients which is used in position control loop. Therefore, the speed and placidity demands can be satisfied furthest at the same time. Because the parameters of pressure control system is inconstant and difficult to identify and the runtime of pressure control is long, a comprehensive intelligent control method is presented, which is composed of Bang-Bang control,fuzzy control and single neuron PSD control. This comprehensive method takes advantage of the merits of three control methods to compensate their shortcomings.Utilizing Windows98 as its O.S., the computer control system is programmed by using Visual C++6.0 language. The Simulink structure of electro-hydraulic servo system is built. Making use of different control methods, a series of performance contrast simulation experiments are conducted. Making use of composite control and PID control, many experiments are conducted on the physical simulation model in the laboratory. Results of simulation andexperiment prove that after we use the composite control method, unit roller can evite the step faster and more placidly. Through practices, we find that the system is more robust than before.