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A novel surface mesh deformation method for handling wing-fuselage intersections

Chinese Journal of Aeronautics 2017年第1期30卷 264-273页

作者： Mario Jaime Martin-burgos Daniel González-Juárez Esther Andrés-Pérez Fluid Dynamics branch National Institute for Aerospace Technology (INTA) Ctra. De Ajalvir km. 4.5 28850 Torrejon de Ardoz Spain Engineering Department lngenieria de Sistemas para la Defensa de Espana (ISDEFE-INTA) Ctra. De Ajalvir km. 4.5 28850 Torrejon de Ardoz Spain Technical University of Madrid (UPM) Ronda de Valencia 3 28012 Madrid Spain

This paper describes a method for mesh adaptation in the presence of intersections, such as wing-fuselage. Automatic optimization tools, using Computational Fluid Dynamics（CFD） simulations, face the problem to adapt the computational grid upon deformations of the boundary surface. When mesh regeneration is not feasible, due to the high cost to build up the computational grid, mesh deformation techniques are considered a cheap approach to adapt the mesh to changes on the geometry. Mesh adaptation is a well-known subject in the literature; however, there is very little work which deals with moving intersections. Without a proper treatment of the intersections,the use of automatic optimization methods for aircraft design is limited to individual components.The proposed method takes advantage of the CAD description, which usually comes in the form of non-uniform rational b-splines（NURbS） patches. This paper describes an algorithm to recalculate the intersection line between two parametric surfaces. Then, the surface mesh is adapted to the moving intersection in parametric coordinates. Finally, the deformation is propagated through the volumetric mesh. The proposed method is tested with the DLR F6 wing-body configuration.

关键词： Aerodynamic shape optimization Computational fluid dynamics Computer-assisted design Geometry parameterizationMesh deformation non-uniform rational b-splines

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FREE-FORM SURFACE RECON-STRUCTION bASED ON NURbS TO SERIAL CROSS-SECTIONS

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Chinese Journal of Mechanical Engineering 2003年第4期16卷 420-423页

作者： SunYuwen WangYuechao LiuWeijun SchoolofMechanicalEngineenng DalianUniversityofTechnologyDalian116024China RoboticsLaboratory ShenyangInstituteofAutomationChineseAcademyofScienceShenyang110015China

A new method for recovering shape from cross-sectional contours with complexbranching structures is presented. First, each branching problem by providing an intermediatecontour using distance function and image processing technology is solved. Then, all contours aredivided into several groups of simple contours. For each group, a NURbS curve is fitted to contourpoints in each section within a given accuracy on a common knot vector. Finally, the NURbS surfaceskinning of these contours is performed for providing a smooth geometric model. The method issuitable to reproduce the object by NC machining or rapid prototyping. Some results demonstrate itsusefulness and feasibility.

关键词： Sectional contour non-uniform rational b-splines branching Surfacereconstruction

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An efficient data structure for calculation of unstructured T-spline surfaces

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工医艺的可视计算（英文） 2019年第1期2卷 7-15页

作者： Wei Wang Yang Zhang Xiaoxiao Du Gang Zhao School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191People’s Republic of China

To overcome the topological constraints of non-uniform rational b-splines,T-splines have been proposed to define the freeform surfaces.The introduction of T-junctions and extraordinary points makes it possible to represent arbitrarily shaped models by a single T-spline surface.Whereas,the complexity and flexibility of topology structure bring difficulty in programming,which have caused a great obstacle for the development and application of T-spline technologies.So far,research literatures concerning T-spline data structures compatible with extraordinary points are very scarce.In this paper,an efficient data structure for calculation of unstructured T-spline surfaces is developed,by which any complex T-spline surface models can be easily and efficiently computed.Several unstructured T-spline surface models are calculated and visualized in our prototype system to verify the validity of the proposed method.

关键词： T-splines non-uniform rational b-splines Unstructured T-mesh Extraordinary points

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