摘要
对涡轮叶片进行精确的数学描述是对其进行数控加工的前提。本文讨论了在给定叶片沿叶高方向上截面数据的情况下 ,采用双三次B样条拟合法和三次NURBS曲面插值法构造叶片曲面的具体算法 ,分析了两种方法的优缺点 ,并给出了具体的算法和公式。深入探讨了在叶片构造过程中遇到的剖分网格确定、插值曲面构造、圆弧的二次NURBS曲线精确表示、NURBS曲线节点插入算法及其升降阶等关键性技术问题。
Precise description is the premise for turbine blades machining. From the section data along the blades height is given, Blades are fitted by dual cubic B spline surface and is interpolated with NURBS surface. At the same time discussion on the merits and drawbacks of these two schemes are given. Some specific problems in connection with blade modeling, such as spanning characteristic mesh, interpolation of curve face modeling, precise presentation arc by second order NURBS curve, node interpolation algorithm of NURBS curve, and degree elevation and reduction etc.
出处
《电加工与模具》
2002年第1期49-52,共4页
Electromachining & Mould
