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P-wave ray velocities and the inverse acoustic problem for anisotropic media

机译:各向异性介质的P波线速度和声学反问题

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摘要

The specific features of the calculation of ray velocities of quasi-longitudinal waves in anisotropic media have been considered. A technique for calculating elastic constants using P-wave ray velocities measured in an ultrasonic experiment on spherical samples is presented. It is shown by an example of tabular data that elastic constants D (11), D (22), and D (33) and combinations of constants (D (12) + 2D (66)), (D (13) + 2D (55)), (D (23) + 2D (44)), (D (14) + 2D (56)), (D (25) + 2D (46)), and (D (36) + 2D (45)) can be calculated most accurately for the general case of anisotropic media with elastic properties of arbitrary symmetry. Since the determining system of equations is illconditioned, the values of elastic constants entering these combinations depend on the choosed initial approximation.
机译:已经考虑了各向异性介质中准纵向波的射线速度计算的特定特征。提出了一种利用超声实验中在球形样品上测得的P波射线速度计算弹性常数的技术。通过表格数据的示例显示,弹性常数D(11),D(22)和D(33)以及常数(D(12)+ 2D(66)),(D(13)+ 2D的组合(55)),(D(23)+ 2D(44)),(D(14)+ 2D(56)),(D(25)+ 2D(46))和(D(36)+ 2D(对于具有任意对称弹性特性的各向异性介质的一般情况,可以最准确地计算出45))。由于确定方程组的条件很差,因此输入这些组合的弹性常数值取决于所选的初始近似值。

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