Modeling And Fuzzy Sliding Model Decoupling Control Of Looper System

Constant looper and tension is a basic characteristic ofmodern hot rolling mill.But in the rolling process, dynamic speed dropand external disturbance has always came up.so it is difficult to matainmass flow balanceable among stands.We need to bulid looper system todetect the deviation and absorb in the looper height which is caused byspeed change to maintain the small tension.In this paper, in the backgroud of the1700mm hot rolling of theAnshan Iron and Steel,We mostly researched the looper system.The mainresearch contents and achievements are presented as follows:Firstly,we analyzed the features of nonlinearity,strong coupling,uncertainty and multi constraint of the looper system and built a dynamicmathematical model of hydraulic looper system at the vicinity of theworking point,and got the system state equation,then worked out thetransfer function and discrete. So multivariable decoupling control ispresented in this paper.Secondly,the PID was introduced to decoupling the system modeland prove the control effectivity.The results of the simulation show theeffctivenness of this method,but the weakness of anti-interference anddecoupling response was shown.So this paper proposed fuzzy slidingdecoupling control. The simulation results show the effectiveness and easonability.Finally, this algorithm can soften the control signal,but there is stillchattering in looper system.Adding low filter to the looper system caneliminate the chattering.The simulation results have indicated that thismethod eliminates the chattering effectively and overcomes theshortcoming.