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ORBi Open Repository and Bibliography (324.361 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 89

  1. Nonlinear System Identification of an F-16 Aircraft Using the Acceleration Surface Method

    Dossogne, Tilàn; Noël, Jean-Philippe; Kerschen, Gaëtan
    In most mechanical engineering applications, the purpose of nonlinear system identification is to upgrade and update a linear finite element (FE) model. Nonlinear elements, whose parameters are found during the identification procedure, are locally added to this linear model to better reproduce the experimental results. The following nonlinear system identification method takes place in this framework, where a linear FE model of the structure is assumed to be available. A nonlinearity characterization step is first performed using qualitative nonlinear stiffness curves computed with the Acceleration Surface Method (ASM). This step enables to determine the location and the mathematical form of the nonlinear...

  2. Experimental Identification of an Aircraft Piccolo Tube Exhibiting Nonsmooth Nonlinearities

    Dossogne, Tilàn; Schoukens, Maarten; Bernay, Bruno; Noël, Jean-Philippe; Kerschen, Gaëtan
    Piccolo tubes are parts of aircraft wings anti-icing system and consist of titanium pipes inserted into the internal structure of the slat. Due to thermal expansion, clearances between the tube and its support are unavoidable, and cause the overall system to exhibit highly nonlinear behaviour, resulting from impacts and friction. This paper aims the complete nonlinear vibration analysis of an aircraft Piccolo tube, from measurements and identification to a thorough understanding of the dynamics and improvements of the design.

  3. A micro-mechanics-based inverse study for stochastic order reduction of elastic UD-fiber reinforced composites analyzes

    Wu, Ling; Adam, Laurent; Noels, Ludovic
    Peer reviewed

  4. OUFTI-Next: the second cubesat of the university of Liège

    Werner, Xavier; Habraken, Serge; Kerschen, Gaëtan; Loicq, Jerôme
    Peer reviewed

  5. Transonic aerodynamic modeling & new FSI infrastructure

    Terrapon, Vincent; Dimitriadis, Grigorios; Crovato, Adrien; Güner, Hüseyin; Thomas, David

  6. Unsteady aerodynamic modeling methodology based on dynamic mode interpolation for transonic flutter calculations

    Güner, Hüseyin; Thomas, David; Dimitriadis, Grigorios; Terrapon, Vincent
    Peer reviewed

  7. Conception and Design of New Space Instrumentation for the Study of Massive Stars in the UV

    Desselle, Richard
    In astrophysics, the UV domain is rich in important information that can be exploited by a multitude of groups of scientists, working on a variety of subjects. Because of the Earth atmosphere, it is not possible to observe this spectral domain from the ground and therefore space observatories are needed to provide the scientific data. Motivated by the study of the properties of massive stars in the UV, this thesis is dedicated to the design of new space instrumentation dedicated to this scientific purpose. In the first part, the conception of an in-flight calibration unit is investigated to answer the needs...

  8. Regression-Based Modeling of a Fleet of Gas Turbine Engines for Performance Trending

    Borguet, Sébastien; Dewallef, Pierre; Leonard, Olivier
    Peer reviewed

  9. Vortex induced vibrations of rectangular cylinders arranged on a grid

    Rigo, François; Denoël, Vincent; Andrianne, Thomas
    Peer reviewed

  10. CUPyDO - An integrated Python environment for coupled fluid-structure simulations

    Thomas, David; Cerquaglia, Marco Lucio; Boman, Romain; Economon, Thomas; Alonso, Juan; Dimitriadis, Grigorios; Terrapon, Vincent
    Peer reviewed

  11. Multi-code coupling througha Python interface for FSI applications

    Thomas, David
    Brief description of a code coupling methodology based on Python wrapping for simulations of fluid-structure interaction problems.

  12. Numerical simulations of turbulent flows: a modeling challenge

    Thomas, David
    A brief presentation of the different turblence models used in CFD computations, especially including RANS and LES models.

  13. Generating atmospheric turbulence using passive grids in an expansion test section of a wind tunnel

    Vita, Giulio; Hemida, Hassan; Andrianne, Thomas; Baniotopoulos, Charalampos C.
    Peer reviewed

  14. Aeroelastic Limit Cycle Oscillations Mitigation Using Linear and Nonlinear Tuned Mass Dampers

    Verstraelen, Edouard
    Flutter is a destructive aeroelastic phenomenon occurring on flexible aeronau- tical structures because of an energy exchange between two or more of the system’s vibration modes and an airflow. In some rare cases, limit cycle oscil- lations (LCOs) related to flutter are observed because of nonlinearities, which might require aircraft redesign or flight envelope limitations. One way of sup- pressing such LCOs could be using Linear and Nonlinear Tuned Vibration Absorbers ((N)LTVAs), which are widely used in civil engineering but have to date received very little attention in the aerospace community. The objectives of this thesis are the understanding of nonlinear...

  15. Stochastic study of unidirectional composites: from micro-structural statistical information to multi-scale analyzes

    Wu, Ling
    Homogenization-based multiscale approaches have been widely developed in order to account for micro-structural geometrical and material properties in an accurate way. However, most of the approaches assume the existence of a statistically Representative Volume Element (RVE). Such a RVE does not always exist for composite materials due to the existing micro-structural uncertainties, motivating the development of a stochastic multi-scale approach for unidirectional composite materials. First Stochastic Volume Elements (SVE) [1] are built from experimental measurements using statistical functions of the fibers features extracted from SEM images and used to generate statistical functions of the micro-structure. The dependent variables are then...

  16. Unified flow-material simulations of light-weight carbon ablators in the VKI Plasmatron: a step forward

    Schrooyen, Pierre; Coheur, Joffrey; Bellas-Chatzigeorgis, Georgios; Turchi, Alessandro; Hillewaert, Koen; Barbante, Paolo; Chatelain, Philippe; Magin, Thierry

  17. A combined Multiple Time Scales and Harmonic Balance approach for the transient and steady-state response of nonlinear aeroelastic systems

    Berci, Marco; Dimitriadis, Grigorios
    Peer reviewed

  18. A CubeSat for UV Astrophysics

    Desselle, Richard
    The full understanding of astrophysical sources requires access to a rather wide wavelength range: every wavelength domain provides another specific piece of information that is needed to solve the puzzle. Several important wavebands, such as the UV domain, can only be covered from space because of atmospheric absorption. This requires either large, sophisticated highly sensitive and versatile observatory satellites (such as IUE, HST, …) or much cheaper and smaller nano-satellites dedicated to a specific scientific question. In this presentation, I present the first results of a feasibility study of a 3U CubeSat for imaging photo-polarimetric observations of bright hot stars...

  19. Unsteady pressure measurement around aerodynamic bodies: Development of a calibration apparatus and wind tunnel testing

    Rigo, François
    Separated flows are complex but interesting to study because they are variable and unsteady. They are present for every bluff bodies and stalled streamlined bodies (at high angle of attack). Experimental aerodynamics is able to study these types of flow, using pressure sensors. Due to sensor size, pressure tubes are used to connect the pressure scanner to the tap (where the pressure is effectively measured). Statically, nothing is changed, but when an unsteady flow is studied, the signal measured by the sensor is perturbed by the tube. The Transfer Function of the tube has to be computed, to correct for...

  20. Vers l'identification non-linéaire des structures industrielles au moyen de sinus balayés

    Dossogne, Tilàn; Noël, Jean-Philippe; Kerschen, Gaëtan
    Les phénomènes vibratoires non-linéaires sont fréquemment rencontrés dans les structures mécaniques et aérospatiales. La division de ces structures en sous-systèmes assemblés ou l’usage de nouveaux matériaux favorisent l’apparition de mécanismes non-linéaires tels que le frottement, les impacts ou l'hystérésis. Il existe donc un besoin croissant en industrie de pouvoir détecter et identifier ces phénomènes non-linéaires sur des structures complexes et à grande échelle. L’ objectif de ce travail est d'établir une méthodologie d’identification des non-linéarités dans les structures industrielles, allant de la détection à la caractérisation et l’estimation de paramètres non-linéaires. Le processus d’identification est basé uniquement sur des mesures...

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