基于通用有限元软件和地基阻抗力时域差分形式，完成了考虑土–结构动力相互作用影响的结构时程分析程序二次开发。
By use of general FEM software and the time-domain difference of ground resistance, the structure history analysis programs with consideration of soil-structure dynamic interaction was developed.
应用有限差分法求解球壳振动的振幅和外加荷载之间的微分关系，得到了球壳振动的时程和相图。
The time history curves and the phase diagram for the oscillation are obtained by solving the differential relation between vibration amplitude and tensile load with finite difference method.
当前实用性较强的射线追踪方法，包括波前法，最短路径法，走时插值法，程函方程有限差分法等。
More practical ray tracing methods currently include the wavefront method, the shortest path method, the travel time epenthesis method, the eikonal equation finite difference method, etc.
本文提出一种将局部算法与扫描算法相结合的、用有限差分解程函方程求取地震波初至时间的方法。
A new technique is given here, which combines partial algorithm with scanning algorithm and obtains wave arrival times by solving eikonal equation with the use of finite difference method.
用逆风有限差分方法计算程函方程；
The upwind finite-difference method is used for traveltime calculations;
用逆风有限差分方法计算程函方程；
The upwind finite-difference method is used for traveltime calculations;
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