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arXiv 1908.11804math-phmath.MP
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由两个交错半无限缺陷引起的离散散射:矩阵Wiener-Hopf问题的约化

Discrete scattering by two staggered semi-infinite defects: reduction of matrix Wiener-Hopf problem

Basant Lal Sharma

AI总结:

针对含交错半无限缺陷的无限方格点时间谐波散射问题,提出矩阵Wiener-Hopf问题的约化方法,将其转化为可通过标量因子分解求解的有限线性代数方程组,为小尺度力学物理应用提供离散范式参考。

摘要:

作为格点上离散Sommerfeld问题的拓展,本文研究了存在一对半无限裂纹或刚性约束时,无限方格点上时间谐波的散射问题。由于缺陷边缘的排列存在交错(也称为偏移),该问题的非对称性导致其矩阵Wiener-Hopf核无法通过任何已知方法约化为标量Wiener-Hopf问题。在对应的连续介质模型中,这一相同问题是公认的难题,其核的对角线上存在呈指数增长的元素,具有特殊结构。从这一角度出发,本文通过重新表述Wiener-Hopf问题并将其约化为一组有限的线性代数方程,求解了该问题的离散对应形式;这些方程的系数可通过标量Wiener-Hopf因子分解求得。本文所研究的涉及格点波的离散范式,与小尺度力学和物理学的现代应用相关。

英文摘要:

As an extension of the discrete Sommerfeld problems on lattices, the scattering of a time harmonic wave is considered on an infinite square lattice when there exists a pair of semi-infinite cracks or rigid constraints. Due to the presence of stagger, also called offset, in the alignment of the defect edges the asymmetry in the problem leads to a matrix Wiener-Hopf kernel that cannot be reduced to scalar Wiener-Hopf in any known way. In the corresponding continuum model the same problem is a well known formidable one which possesses certain special structure with exponentially growing elements on the diagonal of kernel. From this viewpoint the present paper tackles a discrete analogue of the same by reformulating the Wiener-Hopf problem and reducing it to a finite set of linear algebraic equations; the coefficients of which can be found by an application of the scalar Wiener-Hopf factorization. The considered discrete paradigm involving lattice waves is relevant for modern applications of mechanics and physics at small length scales.

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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