Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"geometrically exact"”.
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A geometrically exact dynamic model for spatial elastic rods
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Verification and validation of the geometrically exact beam theory with Legendre spectral finite elements for wind turbine blade analysis, A
… beam model, BeamDyn, which is based on the geometrically exact beam theory (GEBT) has been proposed to replace the incumbent wind turbine blade model in FAST. In the work reported here, GEBT and its spectral finite element implementation in BeamDyn is presented, and a number of numerical and …
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A Geometrically nonlinear curved beam theory and its finite element formulation
This thesis presents a geometrically exact curved beam theory, with the assumption that the cross-section remains rigid, and its finite element formulation/implementation. The theory provides a theoretical view and an exact and efficient means to handle a large range of nonlinear beam problems. A …
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INTERPOLATION OF RIGID-BODY MOTION AND GALERKIN METHODS FOR FLEXIBLE MULTIBODY DYNAMICS
… solver is developed for the formulation of geometrically exact beams, for the determination of solutions of initial and periodic boundary value problems, for the stability analysis of periodic solutions, and for the optimal control/optimization problems of flexible multibody systems.
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Optical-level structural modelling of membrane mirrors for spaceborne telescopes
… is developed through a new approach to the geometrically-exact model, with initial and final shapes as model inputs and load distribution as output. The current approach opens the possibility of manufacturing-driven initial shapes and performance-driven final shapes. The inverse solver is …
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Integrability, localisation and bifurcation of an elastic conducting rod in a uniform magnetic field
… describe the static equilibrium equations of a geometrically exact rod under end tension and moment are extended by incorporating the evolution of a fixed external vector (in the direction of the magnetic field) that interacts with the rod via a Lorentz force. The static equilibrium equations …
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A Computational Framework for Simulating Entanglement-Based Drone Countermeasures with Flexible Filaments Immersed in Viscous Flow
… filament is modeled with the three-dimensional geometrically exact Kirchhoff-Love torsion-free finite element beam formulation. The fluid flow resulting from filament aerodynamic interaction is described through a Boundary Integral (BI) formulation of the incompressible Stokes equations based on …
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Modeling of Nonlinear Unsteady Aerodynamics, Dynamics and Fluid Structure Interactions
… First, we present a semi-analytical, geometrically-exact, unsteady potential flow model is developed for airfoils undergoing large amplitude maneuvers. Towards this objective, the classical unsteady theory of Theodorsen is revisited by relaxing some of the major assumptions such as (1) …
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Nonlinear aeroelastic modelling of large wind turbine composite blades
… which is based on a mixed-form formulation of geometrically exact beam theory (GEBT), taking account of geometric nonlinearities; and 2) a blade load model, which takes account of gravity loads, centrifugal loads and aerodynamic loads. The aerodynamic loads are calculated based on combining the …
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Objective 1D beam FE-formulations for the analysis of deployable pantographic structures
La tesi è dedicata alla formulazione di elementi finiti travi di grado elevato, adatti all'analisi statica di strutture a configurazione variabile (deployable structures) la cui apertura si basa su meccanismi pantografici elastici e/o rigidi. Questi sistemi sono soggetti a deformazioni molto …