分形理论是非线性系统理论中最为活跃的分支之一，研究的是复杂系统产生的不光滑、不可微分的复杂几何体。
Fractal theory is the most active branch of the non-linear science, what it concerns is non-smooth and non-differential geometry produced by complex systems.
描述人造卫星运动的微分方程非常复杂，不可能给出解的解析表达式。
The differential equations that describe the artificial satellite motion are very complicated, and it is impossible to get the analytic express of solution.
接着，利用函数的上次微分构造了不可微向量优化问题（VP）的广义对偶模型，并且在适当的弱凸性条件下建立了弱对偶定理。
Finally, the generalized dual model of the problem (VP) is presented with the help of upper subdifferential of function, and a weak duality theorem is given.
本文提出了基于微分-积分方程组求解n - S方程的有限差分法求解不可压缩实际粘性流体绕孤立翼型流动。
A finite difference method based on differential-integral equation is presented for the solution of Navier-Stokes equations for incompressible viscous flow.
该凸轮传动机构的凸轮具有曲率变化曲线，该曲率变化曲线在凸轮的运动范围之内具有不可连续微分的部位、特别是折点或者跃变。
A CAM of the CAM mechanism has a curvature course with points, in particular bends or jumps, which are not constantly differentiable within a movement region of the CAM.
选取了不可压缩无粘流体的欧拉运动微分方程作为尾流场的控制方程，螺旋桨则用升力线理论计算。
The Euler equations of incompressible and inviscid fluid are used for control equations of the stern flow field, and the propeller is computed by lift line theory.
本文研究一个两跨板状简单模型在不可压缩流中振动时的固有动特性。 应用假设模态法建立系统的运动微分方程。
The dynamical characteristics of a simple two-span parallel flat plate-type model vibrating in incompressible water are studied here.
本文研究一个两跨板状简单模型在不可压缩流中振动时的固有动特性。 应用假设模态法建立系统的运动微分方程。
The dynamical characteristics of a simple two-span parallel flat plate-type model vibrating in incompressible water are studied here.
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