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宽带钢冷连轧过程中,板形、板厚和张力控制之间存在着很强的耦合关系,相互影响对方的调节效果,甚至引起系统不稳定。为了进一步提高控制精度,进行解耦设计实现解耦控制是十分有效的手段。首先建立了冷连轧综合耦合模型,并针对其特点采用分步策略以简化解耦过程,然后设计各解耦控制器组成分步解耦控制系统,并给出其简化设计方案以利于实际应用。最后,基于某1 250 mm八辊五机架冷连轧机第一机架的实际参数,采用Matlab/Simulink工具对简化后的分步解耦控制系统进行仿真分析,结果表明其可有效提高控制精度。
In the process of continuous cold strip rolling, there is a strong coupling relationship between plate shape, plate thickness and tension control, affecting each other’s adjustment effect and even causing system instability. In order to further improve the control accuracy, it is very effective to decouple control to achieve decoupling control. Firstly, a comprehensive coupling model of cold rolling was established and a step-by-step strategy based on its characteristics was adopted to simplify the decoupling process. Then the decoupling controller was designed to form a decoupling control system. The simplified design scheme was given to facilitate the practical application . Finally, based on the actual parameters of the first frame of a 250 mm eight-roller five-stand tandem cold mill, Matlab / Simulink tool was used to simulate the simplified step-by-step decoupling control system. The results show that it can effectively improve the control accuracy .