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首页> 外文期刊>International Journal of Control >Analysis of dynamic nonlinearity of flow control loop through modified relay test probing
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Analysis of dynamic nonlinearity of flow control loop through modified relay test probing

机译:通过改进的继电测试探测分析流量控制环的动态非线性

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摘要

Most of the controller tuning methods in process control are based on linear models. Through the development of a detail model of the actuator-pneumatic valve dynamics, we show that even if the static characteristic of the valve is linear (including possible linearity of the flow dependence on the valve opening) the actuator-valve dynamics are strongly nonlinear. Therefore, tuning of the flow loop will be affected by the selection of the operating point and the amplitude of the relay in the relay feedback test (RFT) or modifications of this test. It is shown that Lyapunov linearisation around an equilibrium point fails to provide a local linear model of the system, and modified RFT probing is used for investigation of the system dynamics. The same test is used for the proportional-integral controller tuning in various operating points. It is recommended that the difference in the dynamic response of the loop for different relay amplitudes and operating points should be accounted for by larger stability margins.
机译:过程控制中的大多数控制器调整方法都基于线性模型。通过开发执行器-气动阀动力学的详细模型,我们表明,即使阀的静态特性是线性的(包括与阀开度有关的流量的可能线性关系),执行器-阀的动力学也是强非线性的。因此,在继电器反馈测试(RFT)或此测试的修改中,流量环路的调整会受到操作点的选择和继电器幅度的影响。结果表明,围绕平衡点的Lyapunov线性化无法提供系统的局部线性模型,而改进的RFT探测用于研究系统动力学。相同的测试用于在各个工作点上进行比例积分控制器调整。建议通过更大的稳定性裕量来解决不同继电器幅值和工作点时环路动态响应的差异。

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