Recursos de colección

ORBi Open Repository and Bibliography (263.678 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 950

  1. 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.

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

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

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

    Noël, Jean-Philippe; Kerschen, Gaëtan

  4. A nonlinear state-space approach to hysteresis identification

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

  5. A new, challenging benchmark for nonlinear system identification

    Tiso, Paolo; Noël, Jean-Philippe
    Peer reviewed

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

    Noël, Jean-Philippe; Kerschen, Gaëtan
    Peer reviewed

  7. 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.

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

    Bertha, Mathieu; Golinval, Jean-Claude

  9. 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...

  10. 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

  11. 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

  12. 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...

  13. 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...

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

    Lambert, Thomas; Dimitriadis, Grigorios
    Peer reviewed

  15. 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...

  16. The EUI instrument on board the Solar Orbiter mission: from breadboard and prototypes to instrument model validation

    Halain, Jean-Philippe; Rochus, Pierre; Renotte, Etienne; Appourchaux, T.; Berghmans, D.; Harra, L.; Schühle, U.; Schmutz, W.; Auchère, F.; Zhukov, A.; Dumesnil, C.; Delmotte, F.; Kennedy, T.; Mercier, R.; Pfiffner, D.; Rossi, Laurence; Tandy, J.; BenMoussa, A.; Smith, Phyllis
    The Solar Orbiter mission will explore the connection between the Sun and its heliosphere, taking advantage of an orbit approaching the Sun at 0.28 AU. As part of this mission, the Extreme Ultraviolet Imager (EUI) will provide full-sun and high-resolution image sequences of the solar atmosphere at selected spectral emission lines in the extreme and vacuum ultraviolet. To achieve the required scientific performances under the challenging constraints of the Solar Orbiter mission it was required to further develop existing technologies. As part of this development, and of its maturation of technology readiness, a set of breadboard and prototypes of critical subsystems...

  17. Mean-Field-Homogenization-based stochastic multiscale methods for composite materials

    Wu, Ling; Lucas, Vincent; Adam, Laurent; Noels, Ludovic
    When considering a homogenization-based multiscale approach, at each integration-point of the macro-structure, the material properties are obtained from the resolution of a micro-scale boundary value problem. At the micro-level, the macro-point is viewed as the center of a Representative Volume Element (RVE). However, to be representative, the micro-volume-element should have a size much bigger than the micro-structure size. For composite materials which suffer from a large property and geometrical dispersion, either this requires RVE of sizes which cannot usually be obtained numerically, or simply the structural properties exhibit a scatter at the macro-scale. In both cases, the representativity of the...

  18. Failure multiscale simulations of composite laminates based on a non-local mean-field damage-enhanced homogenization

    Wu, Ling; Adam, Laurent; Doghri, Issam; Noels, Ludovic
    A multiscale method is developed to study the failure of carbon fiber reinforced composites. In order to capture the intra-laminar failure, 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 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, an implicit non-local method [2] was reformulated to account for the composite material anisotropy. As a result, accurate predictions...

  19. Influence of the inter‐stage coupling flexibility on the dynamics of multi‐stage rotors

    Nyssen, Florence; Golinval, Jean-Claude
    Peer reviewed

  20. Nonlinear analysis of compliant mechanisms: application to tape springs

    Dewalque, Florence; Bruls, Olivier
    Brief summary of the mechanical behaviour of tape springs. Main results obtained by the means of finite element models. Description of the experimental set-up and results. See the extended abstract for more details.

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.