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ORBi Open Repository and Bibliography (278.700 recursos)

In may 2007, the ULg's Administrative Board (joined in June 2007 by the FUSAGx) decided to create an institutional repository and defined a strong institutional self-archiving policy to increase the visibility, accessibility and impact of the University's publications (Board's decision). This decision led to the official launch, in November 2008, of the ORBi platform including both the Academic Bibliography and the Institutional Repository of the Wallonia-Europe University Academy.

Engineering, computing & technology => Aerospace & aeronautics engineering

Mostrando recursos 1 - 20 de 1.079

  1. How the lessons learned from the flight of the Belgian OUFTI-1 CubeSat are leading to an improved successor OUFTI-2 still featuring amateur-radio D-STAR communications

    Broun, Valery; De Dijcker, Sébastien; Werner, Xavier; Verly, Jacques
    Peer reviewed


    Prasad, Chandra Shekhar
    Wind energy is one of the most reliable renewable energy sources and constitutes a viable alternative to fossil and nuclear fuels for the generation of electricity. Over the last couple of decades the increasing demand for wind energy has resulted in increasingly large and sophisticated wind turbines. Accurate but efficient aerodynamic and aeroelastic modelling at the design stage has become a key issue. The surface panel and vortex lattice methods are efficient aerodynamic modelling tools that are routinely employed in design calculations by the aerospace industry. They constitute a good compromise between fidelity and computational cost in the preliminary design and optimization phase. However, these approaches have not been...

  3. Identification of complex nonlinearities using cubic splines with automatic discretization

    Dossogne, Tilàn; Noël, Jean-Philippe; Kerschen, Gaëtan
    One of the major challenges in nonlinear system identification is the selection of appropriate mathematical functions to model the observed nonlinearities. In this context, piecewise polynomials, or splines, offer a simple and flexible representation basis requiring limited prior knowledge. The generally-adopted discretization for splines consists in an even distribution of their control points, termed knots. While this may prove successful for simple nonlinearities, a more advanced strategy is needed for nonlinear restoring forces with strong local variations. The present paper specifically introduces a two-step methodology to select automatically the location of the knots. It proposes to derive an initial model,...

  4. Experimental Assessment of the Influence of Interface Geometries on Structural Dynamic Response

    Dossogne, Tilàn; Jerome, Trevor; Lancereau, Damien; Smith, Scott Alan; Brake, Matthew; Pacini, Ben; Reuss, Pascal; Schwingshackl, Christoph
    Jointed interfaces are sources of the greatest amount of uncertainty in the dynamics of a structural assembly. In practice, jointed connections introduce nonlinearity into a system, which is often manifested as a softening response in frequency response, exhibiting amplitude dependent damping and stiffness. Additionally, standard joints are highly susceptible to unrepeatability and variability that make meaningful prediction of the performance of a system prohibitively difficult. This high degree of uncertainty in joint structure predictions is partly due to the physical design of the interface. This paper experimentally assesses the influence of the interface geometry on both the nonlinear and uncertain...

  5. Development of a unified model for flow-material interaction applied to porous charring ablators

    Coheur, Joffrey; Schrooyen, Pierre; Turchi, Alessandro; Magin, Thierry

  6. Nonlinear Robust Control for Satellite Formation Flying via Adaptive Second-Order Sliding Modes

    Cho, Hancheol; Kerschen, Gaëtan
    Peer reviewed

  7. Recent achievements on ASPIICS, an externally occulted coronagraph for PROBA-3.

    Renotte, Etienne; Denis, François; Desselle, Richard; Fleury-Frenette, Karl; Galy, Camille; Gillis, Jean-Marie; Graas, Estelle; Liébecq, Sylvie; Salvador, Lucas; Servaye, Jean-Sébastien; Stockman, Yvan; Thizy, Cédric
    This paper presents the current status of ASPIICS, a solar coronagraph that is the primary payload of ESA’s formation flying in-orbit demonstration mission PROBA-3. The “sonic region” of the Sun corona remains extremely difficult to observe with spatial resolution and sensitivity sufficient to understand the fine scale phenomena that govern the quiescent solar corona, as well as phenomena that lead to coronal mass ejections (CMEs), which influence space weather. Improvement on this front requires eclipse-like conditions over long observation times. The space-borne coronagraphs flown so far provided a continuous coverage of the external parts of the corona but their over-occulting system...

  8. Notes et exercices de mécanique des fluides : 2ème partie

    Fraeijs de Veubeke, Baudouin

  9. Les grandes méthodes de calcul des modes et fréquences propres dans les structures complexes

    Fraeijs de Veubeke, Baudouin

  10. Variationnal principles in fluid mechanics

    Fraeijs de Veubeke, Baudouin

  11. Recent applications of variational principles to finite element methods

    Fraeijs de Veubeke, Baudouin

  12. Nonlinear dynamics of flexible bodies

    Fraeijs de Veubeke, Baudouin

  13. Une généralisation du principe du maximum pour les systèmes bang-bang avec limitation du nombre de commutations

    Fraeijs de Veubeke, Baudouin

  14. Duality in structural analysis by finite elements

    Fraeijs de Veubeke, Baudouin

  15. Matrix structural analysis

    Fraeijs de Veubeke, Baudouin

  16. On frequency shifting by elementary modifications of inertia and stiffness

    Fraeijs de Veubeke, Baudouin

  17. Cours de théorie des structures : élasticité

    Fraeijs de Veubeke, Baudouin

  18. L'aérodynamique des planeurs

    Fraeijs de Veubeke, Baudouin

  19. Effet gyroscopique des rotors sur les vitesses critiques de flexion

    Fraeijs de Veubeke, Baudouin

  20. Application des équations de Lagrange au calcul des forces de liaison dans les moteurs en étoile

    Fraeijs de Veubeke, Baudouin

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