水平集方法的速度函数定义根据所利用的图像信息可以分为两大类：基于图像梯度和基于图像灰度信息。
The speed function defined in Level set method can be divided into two classes: function based on the gradient of image and function based on the image gray.
综合考虑加速度响应峰值、行程和缓冲力梯度的影响，在极限水平冲击工况下设计了新的五级分布缓冲力。
Considering the influences of acceleration, buffer journey and gradient, five-level buffer force is redesigned under utmost horizontal shock landing condition.
轴向速度的径向梯度沿轴向向下逐渐变小，轴向速度分布也逐渐趋于水平直线状。
On the contrary, the radial gradient of axial velocity decreases downwardly along the axial direction. Therefore, the axial velocity distribution becomes horizontal gradually.
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