Third, in order to calculate microscopic sweep efficiency in pore models, we define sweep boundary of displacement fluid, and determine it by velocity method.
第三，为了计算孔隙模型的微观波及效率，本文给出了驱替液波及边界的定义，并采用速度法确定其在流场中的位置。
The stress and deformation of crankshaft are calculated by finite element method with six load boundary conditions and three displacement boundary conditions.
分别采用六种载荷边界条件和三种位移边界条件对曲轴应力和变形进行了有限元分析；
A kind of polynomial satisfying the displacement boundary conditions is designed, which makes it possible to evaluate the upper limit of fundamental freqrency by Ritz method.
文中还设计了一种能满足位移边界条件的多项式作为振型试函数，从而用里兹法得到相应的上限值。
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