Papers by Author: Ying Yue

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Authors: Ying Yue
Abstract: This paper presents an algorithm for tool path offsetting based on NURBS surface. First the progenitor free surface is fitted with a bi-cubic NURBS surface and the unit normal vectors of the NURBS surface is computed precisely, then the offset surface can be obtained by offsetting the NURBS surface in the normal vector direction with the required distance. Considerable extra computational time can be saved, especially when they are to be offset by several times. As the method successfully computes the unit normal vector of the progenitors, the offset error of this method is zero. The method can also be generalized to other degree NURBS surface, and it can improve the machining accuracy of the surface.
111
Authors: Ying Yue, Jun Jia
Abstract: This paper presents an algorithm for the offsetting of NURBS curve/surface. First the unit normal vectors of the progenitor NURBS curve/surface is computed precisely, then the offset curve/surface can be obtained by offsetting the progenitor curve/surface in the normal vector direction with the required distance. Considerable extra computational time can be saved, especially when they are to be offset by several times. As the method successfully computes the unit normal vector of the progenitors, the offset error of this method is zero. The method can also be generalized to other degree NURBS curve/surface.
537
Authors: Ying Yue
Abstract: To constructed turbine blade efficiently and accurately, NURBS is adopted to fit the turbine blade surface. The cross section and longitudinal node vectors are computed using the centripetal parameter method and the accumulation chord length parameter method separately. The accurate mathematics model of blade is built with non-uniform rational B-spline based on control points and node vector. The matrix expression is also given. The example shows the blade mathematics model satisfies the accuracy requirement completely. It has the practical application value to enhance the blade design quality and carry on the blade dynamic analysis.
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