为研究进气系统结构参数对汽油机换气过程的影响，用有限差分法编制的程序对某3缸汽油机的换气过程进行模拟计算。
In order to find out the effects of inlet system dimensions on the gas exchange quality of gasoline engines, a FDM code was used to simulate the gas exchange process of a 3 - cylinder gasoline engine.
结合有限元方法或有限差分法和极限平衡法各自的优点详细分析边坡稳定性，提出了基于条分法和容重增加法耦合分析的基本原理及边坡安全系数的计算程序。
On the basis of the slice and gravity increase methods, a fundamental principle of couple analysis, and a procedure for calculating the slope safety factor were put forward.
为提高三维有限差分法的计算准确度，本文用地表边条件修改了原来的计算程序。
To improve the accuracy of the numerical evaluation through the 3D finite difference method, the surface boundary conditions are added to modifying the old program.
为提高三维有限差分法的计算准确度，本文用地表边条件修改了原来的计算程序。
To improve the accuracy of the numerical evaluation through the 3D finite difference method, the surface boundary conditions are added to modifying the old program.
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