基于流线型的列车头部外形由三维空间自由曲面构成，提出采用NURBS曲线设计外形型线和用三维nurbs曲面描述复杂三维曲面的车头外形设计方法。
The shape of streamlined train head is made of the 3-dimensional space free form surface, whose shape outline curve USES NURBS curve and complex shape surface USES 3-d NURBS surface.
在深入研究上述方法的基础上，提出了一种自由曲面的非接触自动测量方法，介绍了测量系统的构成、曲面边缘的提取、自动扫描方式的规划以及测头跟踪方式等设计要点。
On the basis of a thoroughgoing study of the above methods, a non contact method for measuring free form surface automatically is given, and some key techniques are also described.
在深入研究上述方法的基础上，提出了一种自由曲面的非接触自动测量方法，介绍了测量系统的构成、曲面边缘的提取、自动扫描方式的规划以及测头跟踪方式等设计要点。
On the basis of a thoroughgoing study of the above methods, a non contact method for measuring free form surface automatically is given, some key techniques are also described.
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