散阶
![散阶](../cache/1040110.jpg)
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界面反射超声散斑一阶统计特性
First order statistical properties of the ultrasonic speckles reflected from an interface
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得出该格式的数值耗散为二阶,数值频散为三阶。
It is found that the numerical dissipation is second order and the numerical dispersion is third order .
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根据模拟计算结果发现,当地层中存在裂缝时,其瑞利导波频散曲线的基阶模式会出现截止或截断现象。
Simulation results show that , when there exists a fissure in the foundation , the first mode curve has a cut-off frequency or assumes an interceptive phenomenon .
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首先通过变换,将程函方程化成一守恒形式;然后再差分离散,得到一阶和二阶精度的差分格式,并证明了差分格式条件稳定。
First , using some transformations , the authors obtain a conservation form from the Eikonal equation , and then not only give two types of finite difference schemes which have first order and second order accuracy respectively , but also prove that they are conditionally convergent .