在此基础上利用微分方程相平面理论分析表面油流谱的局部特性和对流谱局部地进行分类。
The local behavior of the surface oil flow patterns is analyzed with phase plane theory of ordinary differential equations. Also the surface oil flow patterns are locally classified.
本文建立五自由度的平面整车模型，并列出相应的运动微分方程。
In this paper, a planar five-freedom model of whole vehicle is set up and its corresponding sport differential equation is founded.
利用能量变分原理，推导出平面曲线箱梁的基本微分方程、边界条件；
On the basis of the energy-variational principle, the differential equations and boundary conditions of curved box girder are derived.
将平面连续弹性体的几何边界形状考虑为随机量，建立了描述这种连续体特征值问题的随机微分方程和边界条件。
Regarding the boundary shape of elastic structures as random variables, stochastic equations and boundary conditions that govern eigenvalue problems are set up.
构造了存在相间滑移和换热的平面水平含沙射流的封闭控制微分方程组；
The governing equations for a planar horizontal sand jet with interphase slip and heat transfer are constructed, and solved with the aid of the modified and extendcd general program.
分别建立了空腹夹层板基于两种模型的基本微分方程，并推导出矩形平面、周边简支条件下的级数解，得到一些有价值的结论。
The differential equations about the two models are educed, the solution of series at the simply supported boundary is presented, and some valuable conclusions are reached.
该方法不用一般的变分原理，可适用任意变系数正定和非正定偏微分方程。利用这一方法得到一个新的八节点四边形平面应力单元。
It doesn't need the variational principle and can be applied to solve non-positive or positive definite partial differential equations with arbitrary variable coefficient.
该方法不用一般的变分原理，可适用任意变系数正定和非正定偏微分方程。利用这一方法得到一个新的八节点四边形平面应力单元。
It doesn't need the variational principle and can be applied to solve non-positive or positive definite partial differential equations with arbitrary variable coefficient.
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