Last edited by Mezigrel
Monday, February 17, 2020 | History

4 edition of NURBS-based geometry for integrated structural analysis found in the catalog.

NURBS-based geometry for integrated structural analysis

NURBS-based geometry for integrated structural analysis

final report, grant NAG3-1481

by

  • 44 Want to read
  • 36 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Structural analysis,
  • Research and development,
  • Curves (Geometry),
  • Turbomachinery,
  • C (Programming language),
  • Computer aided design,
  • Computer programs

  • Edition Notes

    Other titlesNURBS based geometry for integrated structural analysis.
    Statementprepared by James H. Oliver, principal investigator.
    Series[NASA contractor report] -- NASA-CR-204988., NASA contractor report -- NASA CR-204988.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17564546M
    OCLC/WorldCa39449670

    In practice, cubic curves are the ones most commonly used. The interface to the CAD is modularized by defining a database, which provides IO capabilities on the base of a standardized data exchange format. A knot value that appears only once is called a simple knot. Because of their flexibility and accuracy, NURBS models can be used in any process from illustration and animation to manufacturing.

    Within those intervals, the weight changes according to a polynomial function basis functions of degree d. Therefore, variants of optimally CAD-integrated solvers need to be elaborated with distinct CAD-related functionality which results in different type and amount of data at the interface between CAD and structural analysis. Advanced Search With improvement in innovative manufacturing technologies, e. This PhD project strongly privileges its collaborative role within the Complex Modelling framework.

    Rhinoceros 3D is used for creating the geometry, which later can be exported to MSC. Different from the previous researches, primary focuses are placed on exploring the advantages of the present method in the analysis NURBS-based geometry for integrated structural analysis book extremely thin and thick beams and plates in a wide range of aspect ratios and also in the inner stresses analysis. To this end, the key observation is that the implementation of IBRA or of any FEM-type calculation on the level of assembly only relies on the knowledge of shape functions, shape function derivatives and integration weights at the integration points. To overcome this difficulty, several methods including some mesh-free approaches have been used, for example, the moving least-squares MLS method [ 8 ] and the radial point interpolation method RPIM [ 9 ]. Such database is designed to store not only geometrical quantities but also all the numerical information needed to realize the computations. The geometric effects allow for the steel sheets to be pressed such that, when set against an opposite panel, they are capable of producing both structural depth and connection.


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NURBS-based geometry for integrated structural analysis Download PDF Ebook

An Introduction to NURBS

For example, if a degree 3 NURBS curve with 7 control points has knots 0,0,0,1,2,3,4,4,4, then the curve has uniform knots. As the other extreme, even a classical FE solver can be included in the CAD-integrated workflow, which is achieved by a new meshless approach.

This means that customers are able to move their valuable geometric models between various modeling, rendering, animation, and engineering analysis programs. In the example, the knot values 0, 2, and NURBS-based geometry for integrated structural analysis book have full multiplicity.

NURBS have a precise and well-known definition. This PhD project strongly privileges its collaborative role within the Complex Modelling framework. The outer loops are oriented counter-clockwise, whereas the inner loops are oriented clockwise see also Fig. Features Vital information applicable in many different areas: CAD, scientific visualization, animation, computer games and more.

One distinguishes between inner holes and outer loops. The number of control points must be greater than or equal to the order of the curve.

Because of their flexibility and accuracy, NURBS models can be used in any process from illustration and animation to manufacturing. The curve is represented mathematically by a polynomial of degree one less than the order of the curve.

These papers reflect the ongoing discourse produced chiefly through the design experiments that constitute the main body of my research through the PhD project.

Therefore, numerical techniques such as finite element method FEM have been developed and achieved remarkable success in the analyses of beams and plates. In classical FEA it is the other way around; the basis functions we choose to approximate the unknown solution field is used to approximate the already known geometry Raknes, Three-dimensional control points are used abundantly in 3D modeling, where they are used in the everyday meaning of the word 'point', a location in 3D space.

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A group may then decide to NURBS-based geometry for integrated structural analysis book the complete pipeline or to focus on some of the rings of the chain, be it in the geometrical decomposition or the computational back end, the same way as it is normally done in the FEM community meshing and computation but without losing the advantage of preserving the exact geometry and the advantages of the NURBS basis through the entire pipeline.

This number is usually 1, 2, 3 or 5, but can be any positive whole number. Each control 'point' is actually a full vector of control points, defining a curve.

Isogeometric Analysis is developed for the purpose of utilizing the same data set in both design and analysis Raknes, Beginning with Bezier curves, the book develops a lucid explanation of NURBS curves, then does the same for surfaces, consistently stressing important shape design properties and the capabilities of each curve and surface type.The resulting multi-patch NURBS geometry is then re-parameterized to create a single T-spline surface geometry.

Following this workflow, new analysis-suitable geometries can be easily and efficiently generated using different sets of input design tjarrodbonta.com by: Oct 01,  · Read "NURBS-based analysis of higher-order composite shells, Composite Structures" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Jul 04,  · An entire design-through-analysis workflow solution for isogeometric B-Rep analysis (IBRA), including both the interface to existing CADs and the analysis procedure, is presented. Possible approaches are elaborated for the full scope of structural analysis solvers ranging from low to high isogeometric simulation fidelity.

This is based on a systematic investigation of solver designs suitable Cited by: 8.Solid Modeling Solutions provides advanced NURBS-based geometry pdf called SMLib, TSNLib, and NLib, and the subdivision surface library, SDLib.

An Introduction To Isogeometric Analysis (IGA)

They encompass extensive definition and manipulation of NURBS curves and surfaces with the latest fully functional non-manifold topology.Advanced Numerical Simulation Methods: From CAD Data Directly to Simulation Results - Download pdf edition by Gernot Beer. Download it once and read it on your Kindle device, PC, phones or tablets.

Use features like bookmarks, note taking and highlighting while reading Advanced Numerical Simulation Methods: From CAD Data Directly to Simulation Results.A general concept for embedding in NURBS-based ebook analysis is developed.

• The presented technique permits structural entities in higher-dimensional geometries. • Embedded nonlinear isogeometric spatial Bernoulli beam element formulation. • Examples for embedding structural elements, mass and boundary tjarrodbonta.com by: