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Instability Condition Derivation for Hydraulic AGC System under Pressure Closed-Loop Control

机译：压力闭环控制下液压AGC系统的不稳定条件衍生

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In strip rolling, hydraulic automatic gauge control (HAGC) system is the key element to guarantee the precision of strip gauge. The stability of the kernel pressure closed loop (PCL) in the HAGC system plays an essential role in guaranteeing the rolling process with high performance. Nevertheless, there is some difficulty in exploring the instability mechanism of the HAGC system due to the fact that the PCL is a representative nonlinear closed-loop control system. In this work, for each component of the HAGC system, the mathematical model was established. And on the basis of the linking relation of various elements, we derived the incremental transfer model of the PCL system. Furthermore, in accordance with the deduced information transfer relation, the transfer block diagram of disturbing variable of the PCL system was obtained. Moreover, for the purpose of deriving the instability condition of the PCL system, the Popov frequency criterion was employed. The instability conditions of the HAGC system were obtained under PCL control. Furthermore, the derived instability conditions of the HAGC system were experimentally verified under various working conditions. The research results provide a fundamental foundation for studying the instability mechanism of the HAGC system.
机译：在轧制轧制中，液压自动量表控制（HAGC）系统是保证条带仪表精度的关键元件。 HAGC系统中核压力闭环（PCL）的稳定性在保证具有高性能的轧制过程方面起着重要作用。然而，由于PCL是代表性非线性闭环控制系统，难以探索HAGC系统的不稳定机制。在这项工作中，对于HAGC系统的每个组件，建立了数学模型。并且在各种元素的链接关系的基础上，我们衍生出PCL系统的增量转移模型。此外，根据推导的信息传递关系，获得了PCL系统的干扰变量的转移框图。此外，为了导出PCL系统的不稳定条件，采用波波夫频率标准。在PCL对照下获得HAGC系统的不稳定条件。此外，在各种工作条件下通过实验验证HAGC系统的衍生不稳定条件。研究结果为研究HAGC系统的不稳定机制提供了一个基础的基础。

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