基于NURBS曲面的经编针织物三维模型

 为使经编针织物CAD系统具有更真实的模拟效果,给设计人员提供准确的工艺设计方案,使用NURBS曲线和曲面的方法建立经编针织物的三维结构模型,并利用保形保凸反算插值的方法,在基本型值点的基础上重构表示经编线圈曲线模型的控制多边形,精确地确定空间纱线的实际形态和位置,描绘出精确的空间曲线。借助于Visual C++和Open GL开发工具,在计算机上实现了经编针织物的三维仿真。由实现的基本经编针织物效果图可以知道,这种模型能达到较好的仿真效果。

3-D modeling for warp knitted fabric based on NURBS

In order to obtain more realistic simulation in warp knitting CAD system and provide more exact technologic design,it is necessary to develop a three-dimensional solid modeling of warp knitted structure and realize it on the computer screen.This article offered a 3-D solid model of the loop by using NURBS.By anti-calculating the control points of this model,the more exacted control polygon was gained and the real shape and position of space yarn can be described exactly. With program of Visual C++ and developing tools of Open GL,3-D simulation of warp knitted fabric can be realized visually on computer screen.As shown in the simulated graphics of basic warp knitted fabrics,this modelling can achieve good simulation effect.