IDENTIFICATION AND ADAPTIVE CONTROL OF THE CONCRETE MIXING PROCESS
Author(s): Han Zengjin, Xia Kai. Cao Cihui, Liu Zhong
Pages: 74-84
Year: 1984 Issue: 4
Journal: Control Theory & Applications
Keyword: 自适应控制; 变参数; 目标区; 在线辨识; 数学模型; 混凝土搅拌; 仿真结果; 变化参数; 大时; 模型精度;
Abstract: In this paper, a method of adaptive control applied to a China-made concrete mixer is presented. Firstly, a mathematical model is determined by off-line identification making use of the data measured from manual control to determine the model structure and the deterministic parameters. Then, the on-line identification is performed in order to determine the rest parameters. According to the parameters determined by the on-line identification, the probability distribution of the final consistency of the fresh concrete is predicted. Finally, the necessary control action is determined from the prediction. The control process consists of two steps. First, a coarse regulation is adopted. The water supply is ceased when the probability of the final consistency which enters into the target region is large enough. Then. a fine regulation follows. The amount of the final additional water is determined when the estimated parameters are precisely enough. This ensurs that the probability of the final consistency which is inside the target region is higher then 95 per cent, and the probability of the final consistency which reached the target value is maximal. Simulation shows a good control performance can be achieved by the method suggested in this paper.
Pages: 74-84
Year: 1984 Issue: 4
Journal: Control Theory & Applications
Keyword: 自适应控制; 变参数; 目标区; 在线辨识; 数学模型; 混凝土搅拌; 仿真结果; 变化参数; 大时; 模型精度;
Abstract: In this paper, a method of adaptive control applied to a China-made concrete mixer is presented. Firstly, a mathematical model is determined by off-line identification making use of the data measured from manual control to determine the model structure and the deterministic parameters. Then, the on-line identification is performed in order to determine the rest parameters. According to the parameters determined by the on-line identification, the probability distribution of the final consistency of the fresh concrete is predicted. Finally, the necessary control action is determined from the prediction. The control process consists of two steps. First, a coarse regulation is adopted. The water supply is ceased when the probability of the final consistency which enters into the target region is large enough. Then. a fine regulation follows. The amount of the final additional water is determined when the estimated parameters are precisely enough. This ensurs that the probability of the final consistency which is inside the target region is higher then 95 per cent, and the probability of the final consistency which reached the target value is maximal. Simulation shows a good control performance can be achieved by the method suggested in this paper.
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