arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.06141math.NAcs.CEcs.NA
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圆柱区域标量声学三维多频逆问题的快速算法

A fast algorithm for solving a three-dimensional inverse multiple frequency problems of scalar acoustics in a cylindrical region

Anatoly B. Bakushinsky, Alexander S. Leonov

摘要:

本文提出了一种求解圆柱形区域内非均匀介质声测深三维标量反问题稳定解的新算法。问题的数据是波场的复振幅,在圆柱形层中的声学不均匀性区域之外测量。利用傅里叶变换和傅里叶级数,将反问题归结为求解一组一维第一类弗雷德霍姆积分方程,进而计算非均匀区域波场的复振幅,进而求出该区域所需的声速场。该算法允许在个人计算机上的平均性能足够精细的三维网格在几十秒内解决反问题。数值研究的精度所提出的算法求解模型反问题在不同的频率进行,和数据扰动的算法的稳定性问题进行了研究。

英文摘要:

A new algorithm for the stable solution of a three-dimensional scalar inverse problem of acoustic sounding of an inhomogeneous medium in a cylindrical region is proposed. The data of the problem is the complex amplitude of the wave field, measured outside the region of acoustic inhomogeneities in a cylindrical layer. Using the Fourier transform and Fourier series, the inverse problem is reduced to solving a set of one-dimensional Fredholm integral equations of the first kind, to the subsequent calculation of the complex amplitude of the wave field in the region of inhomogeneity, and then to finding the required sound velocity field in this region. The algorithm allows solving the inverse problem on a personal computer of average performance for sufficiently fine three-dimensional grids in tens of seconds. A numerical study of the accuracy of the proposed algorithm for solving model inverse problems at various frequencies is carried out, and the issues of stability of the algorithm with respect to data perturbations are investigated.

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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