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arXiv 1907.04555math.AP
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压电偏微分方程解的存在性、唯一性和正则性

Existence, Uniqueness and Regularity of Piezoelectric Partial Differential Equations

Benjamin Jurgelucks, Tom Lahmer, Veronika Schulze

摘要:

在过去的一个世纪里,压电电器变得非常重要,计算机模拟在其现代设计过程中发挥着重要作用。尽管人们在压电陶瓷的实际模拟方面做了大量的工作,但关于控制压电陶瓷的偏微分方程仍然存在一些悬而未决的问题。许多压电陶瓷的压电行为可以用一个二阶耦合的偏微分方程系统来描述。这包括三维机械位移的运动方程和电势的耦合静电方程。此外,一个额外的瑞利阻尼方法,确保一个更现实的模型被认为是。本文分析了这类方程解的存在性、唯一性和正则性,并给出了关于长期行为的一个结果。利用Galerkin近似的离散化弱形式证明了具有充分光滑边界的有界区域上的初边值问题的适定性,然后利用格朗沃尔不等式和弱极限给出了无穷维空间中的能量估计.给出了机械位移和速度的初始条件。

英文摘要:

Piezoelectric appliances have become hugely important in the past century and computer simulations play an essential part in the modern design process thereof. While much work has been invested into the practical simulation of piezoelectric ceramics there still remain open questions regarding the partial differential equations governing the piezoceramics. The piezoelectric behavior of many piezoceramics can be described by a second order coupled partial differential equation system. This consists of an equation of motion for the mechanical displacement in three dimensions and a coupled electrostatic equation for the electric potential. Furthermore, an additional Rayleigh damping approach makes sure that a more realistic model is considered. In this work we analyze existence, uniqueness and regularity of solutions to theses equations and give a result concerning the long-term behavior. The well-posedness of the initial boundary value problem in a bounded domain with sufficiently smooth boundary is proved by Galerkin approximation in the discretized weak version, followed by an energy estimation using Gronwall inequality and using the weak limit to show the results in the infinite dimensional space. Initial conditions are given for the mechanical displacement and the velocity.

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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