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arXiv 1608.02880math.AP
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弹性波的逆随机源散射

Inverse Random Source Scattering for Elastic Waves

Gang Bao, Chuchu Chen, Peijun Li

摘要:

本文研究了加性白噪声激励下的弹性波正、逆随机源散射问题。给定源,直接问题是确定随机波场的位移。反问题是从多个频率的波场的边界测量重建随机源的均值和方差。通过构造性的证明,证明了该正问题有唯一的温和解。在此基础上,推导出了反问题的第一类弗雷德霍姆积分方程。给出了求解不适定积分方程的正则化Kaczmarz方法。数值实验证明了该方法的有效性。

英文摘要:

This paper is concerned with the direct and inverse random source scattering problems for elastic waves where the source is assumed to be driven by an additive white noise. Given the source, the direct problem is to determine the displacement of the random wave field. The inverse problem is to reconstruct the mean and variance of the random source from the boundary measurement of the wave field at multiple frequencies. The direct problem is shown to have a unique mild solution by using a constructive proof. Based on the explicit mild solution, Fredholm integral equations of the first kind are deduced for the inverse problem. The regularized Kaczmarz method is presented to solve the ill-posed integral equations. Numerical experiments are included to demonstrate the effectiveness of the proposed method.

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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