acoustic approximation meaning in English

声学近似

Comprehensively discuss the issues in application , adaptive condition and performance , propose a fast arithmetic of forward modeling and depth migration in common shot gathers with one - way acoustic wave equation based on vrselrf , and verify the arithmetic by numerical simulation . concisely discuss the cause of the creation of evanescence and the problem of lateral amplitude discontinuity result from it . fourthly , use the reflectivity model , computed to describe the fracture model , with the formula of computation reflectivity based on elastic - acoustic approximation , and the wavelet model computed by the method , wavelet creation with fourier transform , we proposed , in conjunction with vrselrf wavefield extrapolation operator
第三，将频率波数域稳定的变参考慢度rytov近似广义屏波场延拓算子( vrselrf )应用于叠前与叠后正演模拟、叠前与叠后深度偏移，对算法应用中应注意的问题、适用范围、性能等作了较为全面的论述；提出了基于vrselrf的单程声波方程共炮记录正演模拟和深度偏移快速算法，并通过数值模拟试验对算法进行了验证；简要地讨论了倏逝波的产生原因及其带来的横向振幅不连续性问题。