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.
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