Sliding mode control with gray for level control of flotation cells

 

 

MA Minghua

 

(Huaibei Minsheng Mining Machinery Co., Ltd., Huaibei 235000, China)

 

 

Abstract: Aiming at uncertainties in level control of flotation cells may cause the deterioration of the control quality of the electrohydraulic servo system, and even lead to its instability and the chartering phenomenon caused by the time lag switch, spatial lag switch, the system′s inertia, uncertainties and other factors may influent the quality and stability of the level control of flotation cells, a mixed reaching law sliding model control (SMC) strategy with gray prediction and compensation was proposed to solve those problems, the gray prediction was used to identify and compensate parameter perturbation and external disturbances, the mixed reaching law approach was proposed to overcome the chattering phenomenon. The control algorithm was realized in Matlab to control level control of flotation cells. The results indicate that external disturbance and parameter perturbation of the system can be effectively predicted and compensated by the proposed control strategy, and the problem of chattering was also inhibited obviously; the antiinterference and antiparameters perturbation ability, stability and control quality of the system were improved.

 

Key words: electrohydraulic servo; sliding model control (SMC); gray prediction; gray compensation