Patents
Literature
1 results about "T-spline" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
A T-spline surface can be thought of as a NURBS surface for which a row of control points is allowed to terminate without traversing the entire surface. The control net at a terminated row resembles the letter "T". Modeling surfaces with T-splines can reduce the number of control points in comparison to NURBS surfaces and make pieces easier to merge, but increases the book-keeping effort to keep track of the irregular connectivity. T-splines can be converted into NURBS surfaces, by knot insertion, and NURBS can be represented as T-splines without T's or by removing knots. T-splines can therefore, in theory, do everything that NURBS can do. In practice, enormous amount of programming was required to make NURBS work as well as they do, and creating the equivalent T-Spline functionality would require similar effort. To smoothly join at points where more than three surface pieces meet, T-splines have been combined with geometrically continuous constructions of degree 3 by 3 (bi-cubic) and, more recently, of degree 4 by 4 (bi-quartic).
A blade airfoil modeling method based on T-spline local skinning
The application discloses a kind of blade airfoil modeling methods based on T spline local skin.First, according to the input of each blade section line, the method of combining T spline local skin with the nearest refinement criterion of middle boundary is used to construct topological T network, and the initial blade airfoil surface model is obtained;Then, after uniform sampling and interpolation of each blade section line, a plurality of contour guide curves are obtained, and the comprehensive curvature of all surface guide points on each contour guide curve is calculated;Then, surface region division is carried out, and whether each surface region meets the preset accuracy is calculated and judged, if not, constantly modified and updated, and the control vertex in the surface model is locally interpolated and transformed, until each surface region meets the preset accuracy, and finally the overall smooth blade airfoil surface model is obtained.The application finally generates a periodic T spline surface that takes into account the key section interpolation and overall surface smoothness, with high-order continuity at the closed loop of the surface.
Owner:ZHEJIANG UNIV