文中提出了悬树和扩展轮廓的概念，通过对扩展轮廓的分析和定义，使用动态坐标系和动态包围盒技术，设计了一个扩展轮廓的求取算法。
Basic concepts and definition of suspended tree and extended contour are given, an algorithm to extract it is presented using techniques of dynamic local coordinate system and adaptive bounding box.
特征点匹配算法通过动态建立极坐标系和弹性配对特征点来实现。
Rotary coordinates are dynamically established in our matching algorithm, in which an elastic minutiae paring method is used.
采用拖带坐标系下的退化壳单元，以及动态显式有限元方法求解管材在弯管机上的弯曲成型问题。
A dynamic explicit finite element method is used to pipe bend forming processes on bender in this paper. The degenerated shell element and co-rotational coordinate system are employed.
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