Improved sliding mode control of mine filling slurry concentration based on preview information

ABSTRACT Reducing the fluctuation of slurry concentration is the key to improve the quality of mine filling. This study aims to develop a novel sliding mode control strategy to improve the accuracy of slurry concentration. A mathematical model of a slurry preparation process is firstly established by using the system response method. Secondly, the preview information is integrated into the model by constructing an augmented system. Then, a sliding mode controller is designed by using an improved exponential reaching law. Besides, the uncertainty of the system is estimated and compensated. The results show that the designed control system has excellent dynamic performance, high accuracy and strong robustness. The problem of the large fluctuation range of the slurry con-centration has been preliminarily solved. Finally, the effectiveness of the developed control strategy is verified by the numerical and experimental results.