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arXiv 1403.6281math.APmath.OC
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一类流固耦合数学模型的指数衰减特性

Exponential decay properties of a mathematical model for a certain fluid-structure interaction

George Avalos, Francesca Bucci

摘要:

在这项工作中,我们得到了一个指数稳定性的结果耦合系统的偏微分方程(PDE),其中管理一定的流体-结构相互作用。特别是,三维斯托克斯流与二维力学板方程的边界界面相互作用。在PDE板组件是转动惯量自由的情况下,将有这种流体结构PDE系统的解决方案表现出指数衰减率。通过证明这种衰减,得到了相应半群生成元的预解式的估计,该估计对于沿虚轴的频域值是一致的。随后,我们继续讨论相关的点控制和边界控制的情况下,这种流体结构的PDE模型,最终着眼于最优控制研究有限和无限的水平。(由于所述指数稳定性结果,PDE在时间间隔$(0,\infty)$上的最优控制成为供考虑的合理问题。)

英文摘要:

In this work, we derive a result of exponential stability for a coupled system of partial differential equations (PDEs) which governs a certain fluid-structure interaction. In particular, a three-dimensional Stokes flow interacts across a boundary interface with a two-dimensional mechanical plate equation. In the case that the PDE plate component is rotational inertia-free, one will have that solutions of this fluid-structure PDE system exhibit an exponential rate of decay. By way of proving this decay, an estimate is obtained for the resolvent of the associated semigroup generator, an estimate which is uniform for frequency domain values along the imaginary axis. Subsequently, we proceed to discuss relevant point control and boundary control scenarios for this fluid-structure PDE model, with an ultimate view to optimal control studies on both finite and infinite horizon. (Because of said exponential stability result, optimal control of the PDE on time interval $(0,\infty)$ becomes a reasonable problem for contemplation.)

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