Applying the finite difference method to solve mathematics model of the well tests, and the central difference method is used.

应用有限差分法对试井的数学模型进行求解，采用中心差分。

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For a layered model the computational procedure for the central difference method of direct integration is very simple and easy.

对于层状模型，若采用直接积分的中心差分方法，计算过程十分简单，也可用于有限差分等方法的计算中。

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The spatial field FE discrete method of the virtual work equation and the time field central difference discrete method of the FE equation in the dynamic explicit method are described in detail.

详细分析了动力显式算法中虚功方程的空间域有限元离散方法和有限元方程的时间域中心差分离散方法。

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