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arXiv 1808.10285math.AP
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分数阶阻尼耦合wave equations系统的系数对其镇定的影响

The influence of the coefficients of a system of coupled wave equations with fractional damping on its stabilization

Mohammad Akil, Mouhammad Ghader, Ali Wehbe

摘要:

本文考虑一维空间中两个速度耦合的波动方程组,其边界具有分数阶阻尼。首先,我们证明了系统是强渐近稳定的当且仅当两个方程的耦合参数b是一个离散集的例外实值之外。其次,我们证明了系统不是一致稳定的。因此,我们寻找平滑初始数据的多项式衰减率。利用频域方法结合乘子法,证明了耦合参数b的性质、波传播速度比a的算术性质、分数阻尼阶数对能量衰减率有很大影响。实际上,在等速传播条件下,我们建立了一个最佳多项式能量衰减率。当波以不同的速度传播时,在波传播速度之比满足一定的算术条件下,我们证明了系统的能量多项式衰减到零。

英文摘要:

In this work, we consider a system of two wave equations coupled by velocities in one-dimensional space, with one boundary fractional damping. First, we show that the system is strongly asymptotically stable if and only if the coupling parameter b of the two equations is outside a discrete set of exceptional real values. Next, we show that our system is not uniformly stable. Hence, we look for a polynomial decay rate for smooth initial data. Using frequency domain approach combining with multiplier method, we prove that the energy decay rate is greatly influenced by the nature of the coupling parameter b, the arithmetic property of the ratio of the wave propagation speeds a, the order of the fractional damping. Indeed, under the equal speed propagation condition, we establish an optimal polynomial energy decay rate. Furthermore, when the wave propagate with different speeds, under some arithmetic conditions on the ratio of the wave propagation speeds, we prove that the energy of our system decays polynomially to zero.

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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