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ORBi Open Repository and Bibliography (266.005 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 955

  1. Research on Fast Aeroelastic Modeling Methods in the Transonic Regime

    Güner, Hüseyin; Dimitriadis, Grigorios; Terrapon, Vincent

  2. Experimental passive flutter suppression using a linear tuned vibration absorber

    Verstraelen, Edouard; Habib, Giuseppe; Kerschen, Gaëtan; Dimitriadis, Grigorios
    Peer reviewed

  3. The influence of flight style on the aerodynamic properties of avian wings as fixed lifting surfaces

    Lees, John J.; Dimitriadis, Grigorios; Nudds, Robert L.
    Peer reviewed

  4. Design of an experimental set-up to analyse compliant mechanisms used for the deployment of a panel

    Dewalque, Florence; Bruls, Olivier
    Due to their high complexity, compliant mechanisms require high-fidelity mechanical models to reach a detailed understanding of their characteristics and predict their actual behaviour in various situations. This work focuses on tape springs which are used as an alternative to common mechanisms composed of kinematic joints. They present several assets such as, among others, passive deployment and self-locking, but they are characterised by a highly nonlinear behaviour including buckling, the formation of folds and hysteresis. An experimental set-up is then designed to gather information on these phenomena, while in parallel an equivalent finite element model is developed. Quasi-static and dynamic tests...

  5. Experimental and Numerical Study of Mini-UAV Propeller Performance in Oblique Flow

    Theys, Bart; Dimitriadis, Grigorios; Hendrick, Patrick; De Schutter, Joris
    Peer reviewed

  6. Nonlinear vibration analysis of the SmallSat spacecraft: From identification to design

    Detroux, Thibaut; Noël, Jean-Philippe; Masset, Luc; Kerschen, Gaëtan
    The objective of the present contribution is to introduce nonlinear experimental and numerical tools and methods applicable to real-life structures. The study is illustrated using the SmallSat spacecraft developed by Airbus Defence and Space, which possesses several localized nonlinearities. The computation of nonlinear normal modes and bifurcations reveals that the satellite possesses complex dynamics including modal interactions, quasiperiodic oscillations and isolated resonances.

  7. On the relations between nonlinear resonances and nonlinear normal modes

    Detroux, Thibaut; Noël, Jean-Philippe; Kerschen, Gaëtan

  8. The FNSI method for experimental identification of nonlinear vibrating structures

    Noël, Jean-Philippe; Kerschen, Gaëtan

  9. A nonlinear state-space approach to hysteresis identification

    Noël, Jean-Philippe; Esfahani, Alireza; Kerschen, Gaëtan; Schoukens, Johan
    Peer reviewed

  10. A new, challenging benchmark for nonlinear system identification

    Tiso, Paolo; Noël, Jean-Philippe
    Peer reviewed

  11. Nonlinear system identification in structural dynamics: 10 more years of progress

    Noël, Jean-Philippe; Kerschen, Gaëtan
    Peer reviewed

  12. 10 years of advances in nonlinear system identification in structural dynamics: A review

    Noël, Jean-Philippe; Kerschen, Gaëtan
    Nonlinear system identification is a vast research field, today attracting a great deal of attention in the structural dynamics community. Ten years ago, an MSSP paper reviewing the progress achieved until then concluded that the identification of simple continuous structures with localised nonlinearities was within reach. The past decade witnessed a shift in emphasis, accommodating the growing industrial need for a first generation of tools capable of addressing complex nonlinearities in larger-scale structures. The objective of the present paper is to survey the key developments which arose in the field since 2006 towards developing these tools.

  13. Time-Varying Modal Parameters Identification in the Modal Domain

    Bertha, Mathieu; Golinval, Jean-Claude

  14. Simulations of composite laminates inter and intra-laminar failure using on a non-local mean-field damage-enhanced multi-scale method

    Wu, Ling; Adam, Laurent; Bidaine, Benoît; Noels, Ludovic
    The failure of carbon fiber reinforced composite laminates is studied using a multiscale method. A non-local mean-field homogenization (MFH) method accounting for the damage evolution of the matrix phase of the composite material [1] is considered in each ply in order to capture the intra-laminar failure. In that formulation, an incremental-secant MFH approach is used to account for the elastic unloading of the fibers during the strain softening of the matrix. In order to avoid the strain/damage localization caused by the matrix material softening, the damage enhanced MFH was formulated in an implicit non-local way [2]. Accurate predictions of the...

  15. OUFTI-1: the pioneering nanosatellite of the University of Liège - a long, challenging, and fascinating scientific, technical, and human experience

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

  16. Initial architecture of OUFTI-2, the new educational CubeSat of the University of Liège, featuring D-STAR radiocommunications

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

  17. Modeling of aerodynamic forces in flapping flight with the Unsteady Vortex Lattice Method

    Lambert, Thomas
    This thesis concerns the extensive study and comparison of two approaches commonly used to compute the aerodynamic forces with the unsteady vortex lattice method. The first approach was introduced by Katz and Plotkin and is based on Bernoulli's equations, the second approach was based Joukowski's equations for the computation of forces. This report is divided in two main sections: the study of one wing undergoing simple movements (steady, pure harmonic pitching and pure harmonic plunging) and the study of two separate wings undergoing a combination of flapping and pitching such as seen in avian flight. For the simple test cases, the results...

  18. Experimental Passive Flutter Mitigation Using a Linear Tuned Vibrations Absorber

    Verstraelen, Edouard; Habib, Giuseppe; Kerschen, Gaëtan; Dimitriadis, Grigorios
    The current drive for increased efficiency in aeronautic structures such as aircraft, wind turbine blades and helicopter blades often leads to weight reduction. A consequence of this tendency can be increased flexibility, which in turn can lead to unfavourable aeroelastic phenomena involving large amplitude oscillations and nonlinear effects such as geometric hardening and stall flutter. Vibration mitigation is one of the approaches currently under study for avoiding these phenomena. In the present work, passive vibration mitigation is applied to an experimental aeroelastic system by means of a linear tuned vibration absorber. The aeroelastic apparatus is a pitch and flap wing that...

  19. Induced Drag Calculations with the Unsteady Vortex Lattice Method for Cambered Wings

    Lambert, Thomas; Dimitriadis, Grigorios
    Peer reviewed

  20. ASPIICS: an externally occulted coronagraph for PROBA-3.Design evolution.

    Renotte, Etienne; Carmen Baston, Elena; Bemporad, Alessandro; Capobianco, Gerardo; Cernica, Ileana; Darakchiev, Radoslav; Denis, François; Desselle, Richard; de Vos, Lieve; Fineschi, Silvano; Focardi, Mauro; Górski, Tomasz; Graczyk, Rafał; Halain, Jean-Philippe; Hermans, Aline; Jackson, Carl; Kintziger, Christian; Kosiec, Jacek; Kranitis, Nektarios; Landini, Federico; Lédl, Vít; Massone, Giuseppe; Mazzoli, Alexandra; Melich, Radek; Mollet, Dominique; Mosdorf, Michał; Nicolini, Gianalfredo; Nicula, Bogdan; Oleański, Piotr; Palau, Marie-Catherine; Pancrazzi, Maurizio; Paschalis, Antonis; Peresty, Radek; Plesseria, Jean-Yves; Rataj, Miroslaw; Romoli, Marco; Thizy, Cédric; Thome, Michel; Tsinganos, Kanaris; Wodnicki, Ryszard; Walczak, Tomasz; Zhukov, Andrei
    PROBA-3 is a mission devoted to the in-orbit demonstration of precise formation flying techniques and technologies for future ESA missions. PROBA-3 will fly ASPIICS (Association de Satellites pour l’Imagerie et l’Interferométrie de la Couronne Solaire) as primary payload, which makes use of the formation flying technique to form a giant coronagraph capable of producing a nearly perfect eclipse allowing to observe the sun corona closer to the rim than ever before. The coronagraph is distributed over two satellites flying in formation (approx. 150m apart). The so called Coronagraph Satellite carries the camera and the so called Occulter Satellite carries the...

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