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arXiv 2101.08994math.APcs.NAmath.NA
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一维局部耦合wave equations稳定性的数值研究

Numerical study of the stabilization of 1D locally coupled wave equations

Stéphane Gerbi, Chiraz Kassem, Amina Mortada, Ali Wehbe

摘要:

本文研究了一维速度耦合的两个波动方程组的数值稳定性问题,其中一个内部局部控制只作用于一个方程。在本研究的理论部分,我们区分了两种情况。在第一种情况下,假设两种波以相同的速度传播。在适当的几何条件下,我们证明了能量指数衰减。而在第二种情况下,当波以不同的速度传播时,在适当的几何条件下,我们证明了能量仅以多项式速率衰减。本文在一维数值逼近中证实了这两个结果。然而,当耦合区域与阻尼区域不相交时,系统的稳定性在理论上仍然是一个悬而未决的问题。但是,在这两种情况下,我们都观察到了一种不可预测的行为:当传播速度相同时,能量以指数速率衰减,或者当传播速度不同时,能量以多项式速率衰减。

英文摘要:

In this paper, we study the numerical stabilization of a 1D system of two wave equations coupled by velocities with an internal, local control acting on only one equation. In the theoretical part of this study, we distinguished two cases. In the first one, the two waves assumed propagate at the same speed. Under appropriate geometric conditions, we had proved that the energy decays exponentially. While in the second case, when the waves propagate at different speeds, under appropriate geometric conditions, we had proved that the energy decays only at a polynomial rate. In this paper, we confirmed these two results in a 1D numerical approximation. However, when the coupling region does not intersect the damping region, the stabilization of the system is still theoretically an open problem. But, here in both cases, we observed an unpredicted behavior : the energy decays at an exponential rate when the propagation speeds are the same or at a polynomial rate when they are different.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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