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1)  tessellation of trimmed surface
裁剪曲面离散
2)  surface trimming
曲面裁剪
1.
Scan line algorithm for NURBS surface trimming;
用于非均匀有理B样条曲面裁剪的扫描线算法
2.
This paper discusses the algorithm and implementation of the advanced surface design functions in BSURF-GI (an interactive 3D surface modelling system), presents a method which can do surface trimming along with the suface / surface intersection curves and filleting surface boundaries, and also points out the system further research direction and the way of integration with solid modelling system.
提出了一种能沿曲面与曲面交线和过渡曲面边界线进行曲面裁剪的算法,指出了该系统今后进一步研究的方向及与实体造型系统集成的途径。
3.
In CAD/CAM engineering,surface trimming is one of the most important and complex problems and quadrangular meshes are widely employed.
曲面裁剪运算是CAD/CAM领域最重要、最复杂的问题之一,四边形网格在工程CAD/CAM的实际应用中较为广泛。
3)  trimmed surface
裁剪曲面
1.
Algorithm of trimmed surface triangulation of prepositive disposal in predicting RCS of aircraft;
飞行器RCS计算前置处理中裁剪曲面剖分算法
2.
Here the tool surface is represented by the analytical surface,the trimmed surface is approximated with the triangular patches, and the problem of interfer-ence avoidance is solved by transforming them to the test of relations between tool surface andtriangular patches.
在分析国内外三坐标数控加工刀具轨迹干涉检查和消除算法的基础上,提出了一种适合于球头刀、平底刀和圆角刀的刀具轨迹干涉检查和消除的算法,该算法将刀具看成解析曲面,裁剪曲面由三角片逼近表示,将刀具轨迹干涉检查与消除的问题转化为刀具曲面与三角片的相关性测试。
3.
That is referred to how a model represented by many trimmed surfaces is transferred to a watertight model.
曲面缝合是曲面造型过程中常用到的处理技术,即把由多张裁剪曲面表示的模型转换成一个"不漏水"的模型。
4)  trimmed surfaces
裁剪曲面
1.
An algorithm for triangulating multi trimmed surfaces is introduced in this paper.
提出一种新的多裁剪曲面三角划分的方法。
5)  freeform surfaces
剪裁曲面
6)  trimmed patch
裁剪曲面片
补充资料:离散时间周期序列的离散傅里叶级数表示
       (1)
  式中χ((n))N为一离散时间周期序列,其周期为N点,即
  式中r为任意整数。X((k))N为频域周期序列,其周期亦为N点,即X(k)=X(k+lN),式中l为任意整数。
  
  从式(1)可导出已知X((k))N求χ((n))N的关系
   (2)
  式(1)和式(2)称为离散傅里叶级数对。
  
  当离散时间周期序列整体向左移位m时,移位后的序列为χ((n+m))N,如果χ((n))N的离散傅里叶级数(DFS)表示为,则χ((n+m))N的DFS表示为
  

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