小掠角下波束折射声场的数值计算
Subcritical wavebeam refraction-numeric study
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摘要: 文章针对小掠角下的波束折射声场进行了数值计算,一般将远场的有指向性的球面波视为平面波束,除截取3dB带宽外不再考虑指向性问题,此处,对折射声场进行了更为准确地计算,给出了理论推导和数值计算的结果,并与相关试验进行了定性对比。通过研究,考虑指向性的球面波束(这也是实际情况)的声中心会在折射之前在界面上发声水平位移。同时,指向性对折射声场也有不小的影响。最后,对相关问题提出了建议。Abstract: Computations of spherical wavebeam's refraction on the condition of subcritical incidence are presented.The directional condition and the non-indirectional condition are considered.Also the results are compared with experiments done by forerunners.From the study,a horizontal displacement on the inter-face before refraction is showed.Finally,some ideas on relative problems are given.