COMPUTER-SIMULATION OF ACOUSTIC-WAVE SCATTERING FROM ROUGH SURFACES
COMPUTER-SIMULATION OF ACOUSTIC-WAVE SCATTERING FROM ROUGH SURFACES
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DOI：
10.1088/0022-3727/21/2/006
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发表时间：
1988-02-14
影响因子：
3.4
通讯作者：
OGILVY, JA
中科院分区：
文献类型：
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作者：
OGILVY, JA
介绍了粗糙表面声波散射的计算机模拟。对一组不相关的随机数进行移动平均，从而给出一组随机相关数，该随机相关数表示沿表面以沿着间隔的粗糙表面的高度。初始数据的分布以及移动平均权重的相关性决定了生成的曲面的统计信息。表面是粗糙的，在一个方向上，即“沟槽”，随机的高度和间距的沟槽。利用基尔霍夫理论研究了这些表面的声波散射。这给出了在任何表面点处的总波场的表达式，其表示为局部表面高度和梯度。亥姆霍兹散射积分，然后通过求和的贡献，从每个表面点的表面上进行评估。这给出了远场散射波的振幅或强度。
Describes the computer simulation of acoustic wave scattering from rough surfaces. A moving average is performed on a set of uncorrelated random numbers giving a set of random correlated numbers representing the height of a rough surface at intervals along the surface. The distribution of the initial data, together with the correlation of the moving average weights, determines the statistics of the generated surfaces. Surfaces are rough in one direction only, ie'furrowed', with random heights and spacings of the furrows. The scattering of acoustic waves from these surfaces is studied using Kirchhoff theory. This gives an expression for the total wave field at any surface point in terms of the local surface height and gradient. The Helmholtz scattering integral is then evaluated over the surface by summing the contributions from each surface point. This gives the amplitude or intensity of the far-field scattered wave.