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arXiv 1906.01434math.OC
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Stefan系统的采样控制

Sampled-Data Control of the Stefan System

Shumon Koga, Iasson Karafyllis, Miroslav Krstic

摘要:

本文给出了Stefan问题的采样数据边界反馈控制的结果。Stefan问题描述了一种液-固相变现象,它描述了材料的温度分布和界面位置的时间演化。首先,我们考虑单相Stefan问题的采样控制,假设固相温度保持在平衡熔化温度。我们将零阶保持(ZOH)应用于[23]中开发的标称连续时间控制律,该控制法被设计为将液-固界面位置驱动到期望的设定点。假设控制增益是有界的上直径的倒数的采样时间表,我们证明了闭环系统下的采样数据控制律满足一定的条件,以验证物理模型,系统的原点是全局指数稳定的空间$L_2$范数。两相Stefan问题的类似结果,其中包括液体和固体相的动态与移动界面的位置,通过应用所提出的程序的名义控制律的两相问题中开发的[30]。数值模拟示出了实现为在每个采样时间变化并在该周期期间保持恒定的控制律的期望性能。

英文摘要:

This paper presents results for the sampled-data boundary feedback control to the Stefan problem. The Stefan problem represents a liquid-solid phase change phenomenon which describes the time evolution of a material's temperature profile and the interface position. First, we consider the sampled-data control for the one-phase Stefan problem by assuming that the solid phase temperature is maintained at the equilibrium melting temperature. We apply Zero-Order-Hold (ZOH) to the nominal continuous-time control law developed in [23] which is designed to drive the liquid-solid interface position to a desired setpoint. Provided that the control gain is bounded by the inverse of the upper diameter of the sampling schedule, we prove that the closed-loop system under the sampled-data control law satisfies some conditions required to validate the physical model, and the system's origin is globally exponentially stable in the spatial $L_2$ norm. Analogous results for the two-phase Stefan problem which incorporates the dynamics of both liquid and solid phases with moving interface position are obtained by applying the proposed procedure to the nominal control law for the two-phase problem developed in [30]. Numerical simulation illustrates the desired performance of the control law implemented to vary at each sampling time and keep constant during the period.

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