受生物启发的离散滑模变结构液位控制研究

Biologically inspired discrete sliding mode variable structure system for liquid level control

以趋近律设计的离散滑模变结构控制与系统参数及扰动有关。该文受生物启发,提出一种生物细胞膜分流模型同以趋近律设计的离散滑模变结构控制相结合的控制策略。将该方法应用于遗传算法建模的变参数双容对象的液位控制,仿真及试验结果表明该方法是有效的,它克服了基于趋近律设计的一般离散滑模变结构控制方法的缺陷,可明显改善具有外部干扰及参数变化时的系统稳态性能。该研究为提高现代化农业生产所必需的液位控制性能提供了理论基础。

Discrete time variable structure control system designed by a discrete reaching law is the definite function of the system states. It is sensitive to the system parameter variations and external disturbances. This paper proposes a novel control scheme which combines biologically inspired shunting model with the discrete sliding mode variable structure control. The proposed scheme is applied to the liquid level control system with variant parameters, which is modeled by genetic algorithm. Simulation and laboratory results show that the proposed controller is superior to the conventional discrete sliding mode variable structure controller, which is more robust to system parameter variations and external disturbances and has the better static performances. The study provides a theoretical basis for improving the liquid level control performance in modernized agricultural production.