Wavenumber-Explicit Continuity and Coercivity Estimates in Acoustic Scattering by Planar Screens

Wavenumber-Explicit Continuity and Coercivity Estimates in Acoustic Scattering by Planar Screens
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平面屏幕声散射中的波数显式连续性和矫顽力估计

DOI:
10.1007/s00020-015-2233-6
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发表时间:
2015
影响因子:
0.8
通讯作者:
Chandler-Wilde S
Chandler-Wilde S
中科院分区:
数学3区
文献类型:
--
作者:
Chandler-Wilde S

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本文研究了平面声软(Dirichlet)和平面声硬(Neumann)屏时谐声散射的经典第一类边界积分方程。我们证明了相关的边界积分算子(声学单层和超奇异运营商分别)在适当的分数Sobolev空间的连续性和连续性,与波数明确的边界上的连续性和连续性常数。我们的分析不需要对屏幕的边界进行正则性假设(除了屏幕是平面的相对开有界子集之外),基于边界积分算子的谱表示,并建立在Ha-Duong的结果(Jpn J Ind Appl Math 7:489-513,1990; Integr Equ Oper Theory 15:427-453,1992)上。
We study the classical first-kind boundary integral equation reformulations of time-harmonic acoustic scattering by planar sound-soft (Dirichlet) and sound-hard (Neumann) screens. We prove continuity and coercivity of the relevant boundary integral operators (the acoustic single-layer and hypersingular operators respectively) in appropriate fractional Sobolev spaces, with wavenumber-explicit bounds on the continuity and coercivity constants. Our analysis, which requires no regularity assumptions on the boundary of the screen (other than that the screen is a relatively open bounded subset of the plane), is based on spectral representations for the boundary integral operators, and builds on results of Ha-Duong (Jpn J Ind Appl Math 7:489–513, 1990; Integr Equ Oper Theory 15:427–453, 1992).
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