Results 31 to 40 of about 6,844,739 (267)

NURBS approximation of surface/surface intersection curves

Advances in Computational Mathematics, 1994
To compute parametric representations for non-parametric algebraic intersection curves requires approximation. In this paper, the authors present algorithms to construct a piecewise rational \(B\)-spline approximation to a space curve, which comes from the intersection of two implicitly defined surfaces, or the intersection of two parametric defined ...
Bajaj, Chandrajit L., Xu, Guoliang
openaire   +2 more sources

Rotation-Angle Solution and Singularity Handling of Five-Axis Machine Tools for Dual NURBS Interpolation

Machines, 2023
Dual NURBS interpolation has been proven an essential technique for high-speed precision machining of complex surfaces. The solution of rotation angles and their derivatives is the basis of kinematic transformation and feedrate optimization in dual NURBS
Pengpeng Sun, Qiang Liu, Jian Wang, Zhenshuo Yin, Liuquan Wang   +4 more
doaj   +1 more source

Point-cloud segmentation with in-silico data augmentation for prostate cancer treatment. [PDF]

Med Phys
Abstract Background In external x‐ray radiation therapy, the administered dose distribution can deviate from the planned dose due to alterations in patient positioning, changes in intra‐fraction anatomy, and the limited precision of the beam delivery system in spatial terms.
Zhou J, Salvatori M, Fejza K, Hermann GM, Fulvio AD.   +4 more
europepmc   +2 more sources

Biomimetic Design and Fabrication of Interior Architecture of Tissue Scaffolds Using Solid Freeform Fabrication [PDF]

, 2004
Modeling, design and fabrication of tissue scaffolds with intricate architecture, porosity and pore size for desired tissue properties presents a challenge in tissue engineering.
Bradburyq, T., Lau, A., Lau, W., Starly, B., Sun, W.   +4 more
core   +1 more source

An Improvement on the Upper Bounds of the Partial Derivatives of NURBS Surfaces

Mathematics, 2020
The Non-Uniform Rational B-spline (NURBS) surface not only has the characteristics of the rational Bézier surface, but also has changeable knot vectors and weights, which can express the quadric surface accurately.
Ye Tian, Tao Ning, Jixing Li, Jianmin Zheng, Zhitong Chen   +4 more
doaj   +1 more source

An Isogeometric Analysis Approach to Kinematics of Spatial Rigid Multibody Systems with Imperfect Joints [PDF]

Modeling, Identification and Control, 2020
This paper proposes a novel generic methodology for kinematics of spatial rigid-multibody systems with and without lubricated joints. In this method CAD surface representations in the form of non-uniform rational B-splines (NURBS) are used to address the
Remzija Cerimagic, Lisbeth Fajstrup, Torben Ole Andersen, Per Johansen   +3 more
doaj   +1 more source

T-spline based unifying registration procedure for free-form surface workpieces in intelligent CMM [PDF]

, 2017
With the development of the modern manufacturing industry, the free-form surface is widely used in various fields, and the automatic detection of a free-form surface is an important function of future intelligent three-coordinate measuring machines (CMMs)
Han, Zhenhua, Liu, Shugui, Ma, Xinhui, Wang, Yingmo, Zhang, Guoxiong, Zhang, Xiaodong   +5 more
core   +2 more sources

3D Reality-Based Survey and Retopology for Structural Analysis of Cultural Heritage

Sensors, 2022
Cultural heritage’s structural changes and damages can influence the mechanical behaviour of artefacts and buildings. The use of finite element methods (FEM) for mechanical analysis is largely used in modelling stress behaviour. The workflow involves the
Sara Gonizzi Barsanti, Mario Guagliano, Adriana Rossi   +2 more
doaj   +1 more source

A GEOMETRIC PROCESSING WORKFLOW FOR TRANSFORMING REALITY-BASED 3D MODELS IN VOLUMETRIC MESHES SUITABLE FOR FEA [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017
Conservation of Cultural Heritage is a key issue and structural changes and damages can influence the mechanical behaviour of artefacts and buildings. The use of Finite Elements Methods (FEM) for mechanical analysis is largely used in modelling stress ...
S. Gonizzi Barsanti, G. Guidi
doaj   +1 more source

Smooth shapes with spherical topology: Beyond traditional modeling, efficient deformation, and interaction

Computational Visual Media, 2017
Existing shape models with spherical topology are typically designed either in the discrete domain using interpolating polygon meshes or in the continuous domain using smooth but non-interpolating schemes such as subdivision or NURBS. Both polygon models
D. Schmitter, P. García-Amorena, M. Unser   +2 more
doaj   +1 more source