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arXiv 1301.2149math.OC
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基于原始方法和Carleman估计的wave equation的数值可控性

Numerical controllability of the wave equation through primal methods and Carleman estimates

Nicolae Cîndea, Enrique Fernandez-Cara, Arnaud Munch

摘要:

本文讨论一维带位势波动方程边界零控制的数值计算。我们的目标是计算一个近似的控制,驱动解决方案从一个规定的初态为零,在一个足够大的可控性时间。我们不使用在这项工作中的对偶参数,而是探索一个直接的方法在全球Carleman估计的框架。更确切地说,我们认为控制,最大限度地减少了一类容许零控制功能,涉及加权积分的状态和控制。最优性条件表明,无论是最优控制和相关的状态表示在一个新的变量,在空间-时域中定义的四阶椭圆问题的解决方案。我们首先证明了,对于由波动方程的整体Carleman不等式确定的特定权重,该问题是适定的。然后,在有限元法的框架下,我们引入了一族有限维近似控制问题,并证明了一个强收敛结果。数值实验证实了分析。最后,我们提出几点意见。

英文摘要:

This paper deals with the numerical computation of boundary null controls for the 1D wave equation with a potential. The goal is to compute an approximation of controls that drive the solution from a prescribed initial state to zero at a large enough controllability time. We do not use in this work duality arguments but explore instead a direct approach in the framework of global Carleman estimates. More precisely, we consider the control that minimizes over the class of admissible null controls a functional involving weighted integrals of the state and of the control. The optimality conditions show that both the optimal control and the associated state are expressed in terms of a new variable, the solution of a fourth-order elliptic problem defined in the space-time domain. We first prove that, for some specific weights determined by the global Carleman inequalities for the wave equation, this problem is well-posed. Then, in the framework of the finite element method, we introduce a family of finite-dimensional approximate control problems and we prove a strong convergence result. Numerical experiments confirm the analysis. We complete our study with several comments.

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