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Faculté des Sciences appliquées
Faculté des Sciences appliquées
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Master thesis and internship[BR]- Master's Thesis : Deterministic model construction for flutter characterisation of cantilever flat plates[BR]- Internship (linked to master's thesis)

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Oleffe, Thomas ULiège
Promotor(s) : Dimitriadis, Grigorios ULiège
Date of defense : 7-Sep-2020/9-Sep-2020 • Permalink : http://hdl.handle.net/2268.2/10270
Details
Title : Master thesis and internship[BR]- Master's Thesis : Deterministic model construction for flutter characterisation of cantilever flat plates[BR]- Internship (linked to master's thesis)
Author : Oleffe, Thomas ULiège
Date of defense  : 7-Sep-2020/9-Sep-2020
Advisor(s) : Dimitriadis, Grigorios ULiège
Committee's member(s) : Andrianne, Thomas ULiège
Terrapon, Vincent ULiège
Language : English
Number of pages : 69
Discipline(s) : Engineering, computing & technology > Aerospace & aeronautics engineering
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil en aérospatiale, à finalité spécialisée en "aerospace engineering"
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] Assessing exactly the flutter speed and frequency is of prior importance when designing an aircraft to ensure a safe flight envelope and to this purpose, experimental and numerical tests have been developed throughout the years. To simplify the computation of the critical speed and frequency, this master thesis proposes to build a mathematical model for flutter characterisation as a function of geometrical parameters of cantilever flat plates namely the Aspect Ratio, the taper ratio and the sweep angle, on the basis of the unsteady Vortex Lattice Method (VLM). The investigation of the hump mode activation as a function of those parameters is carried out in first place to assess its conditions of appearance and it is concluded that a straight discontinuity line can be drawn on the domain to distinguish the zone where the hump is active from the zone where it is not. Then, the linear regression theory is used for building the model and three different polynomial orders are compared namely a simple first order polynomial, a seconde order polynomial with interaction terms only and a second order polynomial comprising both the direct and the interaction terms. and conclusion is made that a incomplete second order model provides results reliable up to 99%. A comparison is made with experimental results obtained in wind tunnel. To do so, an excitation system is designed so that its eigenfrequencies do not interfere with those of the tested plates. Several issues encountered due to lack of time because of the sanitary crisis prevented to perform more than two tests for which the different problems could not all be checked and solved. In the end, a proper conclusion about the practical validity of the model could not be drawn.


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Author

  • Oleffe, Thomas ULiège Université de Liège > Master ingé. civ. aérospat., à fin.

Promotor(s)

Committee's member(s)

  • Andrianne, Thomas ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Interactions Fluide-Structure - Aérodynamique expérimentale
    ORBi View his publications on ORBi
  • Terrapon, Vincent ULiège Université de Liège - ULiège > Département d'aérospatiale et mécanique > Modélisation et contrôle des écoulements turbulents
    ORBi View his publications on ORBi
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