ORBi Open Repository and Bibliography
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.
Nonlinear ground vibration identification of an F-16 aircraft - Part 2: Understanding Nonlinear Behaviour in Aerospace Structures Using Sine-sweep Testing - Dossogne, Tilàn; Noël, Jean-Philippe; Grappasonni, Chiara; Kerschen, Gaëtan; Peeters, Bart; Debille, Jan; Vaes, Mark; Schoukens, Johan
Although they are generally modelled as linear systems, aircraft structures are known to be prone to nonlinear phenomena. A specific challenge encountered with fighter aircraft, besides aeroelastic nonlinearity, is the modelling of the wing-to-payload mounting interfaces. For large amplitudes of vibration, friction and gaps may be triggered in these connections and markedly impact the dynamic behaviour of the complete structure. In this series of two papers, the nonlinear dynamics of an F-16 aircraft is investigated using rigorous methods applied to real data collected during a ground vibration test campaign.
The present work focuses on the analysis of sine-sweep measurements in order...
The nonlinear tuned vibration absorber in practice - Grappasonni, Chiara; Habib, Giuseppe; Detroux, Thibaut; Kerschen, Gaëtan
Vibration mitigation of engineering structures is commonly achieved by means of passive absorbers, often designed following the well-established Den Hartog’s equal-peak strategy.
However, the linearity assumption this method build on is challenged when the primary structure exhibits frequency-energy-dependent oscillations. In this context, the development of a nonlinear counterpart to classical tuned vibration absorber would be extremely beneficial.
The present study introduces a new nonlinear tuned vibration absorber (NLTVA) whose nonlinear functional form is tailored according to the frequency-energy dependence of the nonlinear primary structure. The design is based on a nonlinear generalization of Den Hartog’s method, to ensure equal peaks...
Architecture of educational OUFTI-1 nanosatellite of University of Liège, as tested in preparation for space flight - Werner, Xavier; De Dijcker, Sébastien; Broun, Valery; Kerschen, Gaëtan; Verly, Jacques
Overview of the OUFTI-1 nanosatellite space segment. The OUFTI-1 project was initiated in September 2007. The nanosatellite is a one-unit (1U) CubeSat. Its main payload is - in essence - a D-STAR repeater in space, potentially the first one ever. D-STAR is an amateur-radio (“ham”), digital radio communication - protocol (with associated equipment) allowing the simultaneous transmission of voice and data, such as GPS coordinates and call-signs.
Overview of the ground facilities for controlling the OUFTI-1 nanosatellite and for routing its radio-communications through the worldwide D-STAR repeater network - Werner, Xavier; De Dijcker, Sébastien; Broun, Valery; Kerschen, Gaëtan; Verly, Jacques
Overview of the current state and upgrade plan of the OUFTI-1 nanosatellite ground segment. The OUFTI-1 project was initiated in September 2007. The OUFTI-1 nanosatellite is a one-unit (1U) CubeSat. Its main payload is - in essence - a D-STAR repeater in space, potentially the first one ever. D-STAR is an amateur-radio (“ham”), digital radio-communication protocol (with associated equipment) allowing the simultaneous transmission of voice and data, such as GPS coordinates and call-signs. The satellite was tested in 2014 and 2015 within the ESA’s Education Office Fly Your Satellite! (FYS) project, and it is now fully qualified and ready for...
Thermal-vacuum and vibration test campaigns that led to the OUFTI-1 nanosatellite being fully qualified by ESA for launch and operation in Earth orbit - De Dijcker, Sébastien; Werner, Xavier; Broun, Valery; Kerschen, Gaëtan; Verly, Jacques
OUFTI-1’s test campaigns were divided into two phases. The goal of Phase 1 is to demonstrate that the different functionalities of the satellite work as intended. The goal of Phase 2 is to subsequently demonstrate that the satellite can withstand the launch into orbit, and then work properly in the conditions of space. The corresponding tests thus involve both thermal-vacuum environmental tests (in appropriate test chambers) and vibration tests (on appropriate vibration pods). The conditions simulated during these tests are as close as possible to those that the satellite will encounter during its mission, covering as many cases as possible,...