【摘要】 采用双三次NURBS方法对某型号转子进行几何造型,对造型过程中出现的曲面延伸、求交和裁剪等问题进行了研究.根据叶片的形状特征,以曲线的几何形式为基础,提出了一种简单实用的曲线曲面延伸方法,实现了切矢量连续的叶片型面的延伸.对于两相交面分别为自由曲面和解析曲面的求交问题,提出了一种简化的跟踪算法,实现了转子叶片型面和圆台面的准确求交和裁剪,从而实现转子精确的几何造型.更多还原

【Abstract】 Double NURBS method is used to construct the surface model of a rotor.The technologies of surface extension,surface intersection and surface trimming are studied.Based on the geometric expression of the NURBS curve,a simple and effective method of curve and surface extension is put forward,and the blade surface is then successfully extended with the tangent vector by repeatedly applying the above method.A simplified tracking approach is adopted to realize the surface/surface intersection,of which one surface is analytic surface and the other is free surface.更多还原