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arXiv 2008.12746physics.flu-dynmath.OC
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液膜流动的主动控制:超越降阶模型

Active control of liquid film flows: beyond reduced-order models

Radu Cimpeanu, Susana N. Gomes, Demetrios T. Papageorgiou

摘要:

强大而有效地控制非线性系统动态的能力是当前许多技术挑战的核心,从药物输送系统到确保飞行安全。大多数这样的场景太复杂,无法直接处理,降阶建模被用来创建目标系统的可行表示。简化的设置允许开发严格的控制理论方法,但其效果的传播回到层次结构并进入现实世界的系统仍然是一个重大的挑战。使用规范的设置下的积极的闭环控制的吹吸形式的反馈控制的作用下,一个斜面下降的液膜,我们开发了一个多层次的建模框架,包含分析模型和直接的数值模拟作为一个在硅片上的实验平台。构建战略在廉价的较低层次的层次结构中,我们发现,离线控制转移是不可行的,但分析知情的反馈策略显示出良好的潜力,甚至远远超出了预期的适用范围的模型。控制的稳定性和治疗的非线性方面的详细影响进行了详细研究,以获得内部流的信息传递的理解,这可以帮助过渡到其他控制丰富的框架和应用程序。

英文摘要:

The ability to robustly and efficiently control the dynamics of nonlinear systems lies at the heart of many current technological challenges, ranging from drug delivery systems to ensuring flight safety. Most such scenarios are too complex to tackle directly and reduced-order modelling is used in order to create viable representations of the target systems. The simplified setting allows for the development of rigorous control theoretical approaches, but the propagation of their effects back up the hierarchy and into real-world systems remains a significant challenge. Using the canonical setup of a liquid film falling down an inclined plane under the action of active feedback controls in the form of blowing and suction, we develop a multi-level modelling framework containing both analytical models and direct numerical simulations acting as an in silico experimental platform. Constructing strategies at the inexpensive lower levels in the hierarchy, we find that offline control transfer is not viable, however analytically-informed feedback strategies show excellent potential, even far beyond the anticipated range of applicability of the models. The detailed effects of the controls in terms of stability and treatment of nonlinearity are examined in detail in order to gain understanding of the information transfer inside the flows, which can aid transition towards other control-rich frameworks and applications.

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