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arXiv 2302.07536math.AP
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广义分数阶Moore-Gibson-Thompson方程的统一分析框架:适定性与奇异极限

A unified analysis framework for generalized fractional Moore--Gibson--Thompson equations: Well-posedness and singular limits

Mostafa Meliani

摘要:

在声学中,当在声波传播的建模中考虑一类热弛豫定律时,出现了高阶时间方程。在这项工作中,我们分析了一类这样的方程的初边值问题,并确定了松弛时间为零的解决方案的行为。特别地,我们允许首项是分数类型的。所研究的模型可以被看作是一个推广的成熟的(分数)摩尔-吉布森-汤普森方程与三个,一般非本地,卷积项涉及两个不同的内核。这些卷积的相互作用将影响到统一分析和极限过程。为了统一这类局部和非局部高阶方程的理论处理,我们放松了对首项核的经典假设,并将其视为Radon测度。在建立统一的适定性相对于所考虑的一般模型的弛豫时间,我们连接它,通过一个微妙的奇异极限过程,分数二阶模型的线性声学。

英文摘要:

In acoustics, higher-order-in-time equations arise when taking into account a class of thermal relaxation laws in the modeling of sound wave propagation. In this work, we analyze initial boundary value problems for a family of such equations and determine the behavior of solutions as the relaxation time vanishes. In particular, we allow the leading term to be of fractional type. The studied model can be viewed as a generalization of the well-established (fractional) Moore--Gibson--Thompson equation with three, in general nonlocal, convolution terms involving two different kernels. The interplay of these convolutions will influence the uniform analysis and the limiting procedure. To unify the theoretical treatment of this class of local and nonlocal higher-order equations, we relax the classical assumption on the leading-term kernel and consider it to be a Radon measure. After establishing uniform well-posedness with respect to the relaxation time of the considered general model, we connect it, through a delicate singular limit procedure, to fractional second-order models of linear acoustics.

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