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See detailExperimental Validation of Structural Damping Models for Tape Springs
Dewalque, Florence ULg; Bruls, Olivier ULg

in Proceedings of the 6th European Conference for Aerospace Sciences (EUCASS) (2015)

The objective of this paper is to study the effect of structural dissipation on the dynamic response of tape springs using experimentally-validated finite element models. In order to reach this goal, an ... [more ▼]

The objective of this paper is to study the effect of structural dissipation on the dynamic response of tape springs using experimentally-validated finite element models. In order to reach this goal, an experimental set-up is built. It consists of two tape springs connected to a fixation support and a dummy panel. The data are collected through a force plate and a 3D motion analysis system. The post-treatment of the experimental results and a comparison with a finite element model show that the Kelvin-Voigt model gives a fair approximation of the structural damping for small oscillations, however, more advanced model should be considered in future works for a better understanding in case of large displacements. [less ▲]

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See detailExperimental Validation Of The Constant Level Method For Identification Of Non-Linear Multi-Degree-Of-Freedom Systems
Dimitriadis, Grigorios ULg

in Journal of Sound & Vibration (2002), 258(5), 829-845

System identification for non-linear dynamical systems could find use in many applications such as condition monitoring, finite element model validation and determination of stability. The effectiveness ... [more ▼]

System identification for non-linear dynamical systems could find use in many applications such as condition monitoring, finite element model validation and determination of stability. The effectiveness of existing non-linear system identification techniques is limited by various factors such as the complexity of the system under investigation and the type of non-linearities present. In this work, the constant level identification approach, which can identify multi-degree-of-freedom systems featuring any type of non-linear function, including discontinuous functions, is validated experimentally. The method is shown to identify accurately an experimental dynamical system featuring two types of stiffness non-linearity. The full equations of motion are also extracted accurately, even in the presence of a discontinuous non-linearity. [less ▲]

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See detailExperimental Validation of the Constant Level method for Identification of Nonlinear Multi Degree of Freedom Systems
Dimitriadis, Grigorios ULg

in Starr, A. G.; Rao, R. B. K. N. (Eds.) Proceedings of the 14th International Congress on Condition Monitoring and Diagnostic Engineering Management (2001, September)

System identification methods for nonlinear dynamical systems could find uses in many applications such as condition monitoring, finite element model validation and stability determination. The ... [more ▼]

System identification methods for nonlinear dynamical systems could find uses in many applications such as condition monitoring, finite element model validation and stability determination. The effectiveness of existing nonlinear system identification techniques is limited by various factors such as the complexity of the system under investigation and the type of nonlinearities present. In this work, the Constant Level Identification approach, which can identify multi degree-of-freedom systems featuring any type of nonlinear function, including discontinuous functions, is validated experimentally. The method is shown to yield accurate identifications of an experimental dynamical system featuring two types of stiffness nonlinearity. The full equations of motion are accurately extracted, even in the presence of a discontinuous nonlinearity. [less ▲]

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See detailExperimental validation of the finite element simulation of the first stroke in single point incremental forming
Watzeels, Ken; Tunckol, Y.; Henrard, Christophe ULg et al

in Banabic, D. (Ed.) Proceedings of the 8th ESAFORM Conference on Material Forming (2005)

Single-point incremental forming (SPIF) is a sheet metal forming technique that has gained particular interest in rapid prototyping and small volume production. The study of the underlying forming ... [more ▼]

Single-point incremental forming (SPIF) is a sheet metal forming technique that has gained particular interest in rapid prototyping and small volume production. The study of the underlying forming mechanisms is supported by new developments in finite element simulations and experimental full field strain measurements. This article aims to describe the possibilities and difficulties encountered during validation of finite element predictions of the incremental forming process. The drawing of a straight line into a metal plate was selected as a first test case for this kind of validation. Results of both finite element simulation and experimental work will be discussed. [less ▲]

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See detailExperimental Validation of Two Nonlinear Identification Techniques on a Single Degree of Freedom System
Lenaerts, Vincent; Golinval, Jean-Claude ULg; Ruzzene, M. et al

Conference given outside the academic context (1999)

The identification of a single degree of freedom non-linear system is performed on experimental data using two different techniques : a method based on the Wavelet transform and a Direct Parameter ... [more ▼]

The identification of a single degree of freedom non-linear system is performed on experimental data using two different techniques : a method based on the Wavelet transform and a Direct Parameter estimation method. Both techniques are based on the analysis of the system free responses and result in the estimation of linear and non-linear physical parameters. The agreement between the two methods was found to be encouraging and opens to the possibility of extending them to the analysis of more complicated systems. [less ▲]

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See detailExperimental validation protocol for micro-CT as screening tool for bone tissue engineering scaffolds
Kerckhofs, Greet ULg; Schrooten, Jan; Van Cleynenbreugel, Tim et al

Conference (2007)

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See detailExperimental – Numerical Model Interaction : Example of a Large Dam Project in Laos
Mouzelard, Thibaut; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Water Resources Management, Progress in Water Resources (2001)

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See detailExperimentally induced epizootic rabbit enteropathy: Clinical, histopathological, ultrastructural, bacteriological and haematological findings
Dewrée, Roxane; Meulemans, L.; Lassence, Cédric ULg et al

in World Rabbit Science (2007), 15(2, APR-JUN), 91-102

Epizootic rabbit enteropathy is an emerging disease that has appeared in French intensive enclosed rabbit farms since the beginning of 1997. Common clinical signs are mild watery diarrhoea with ... [more ▼]

Epizootic rabbit enteropathy is an emerging disease that has appeared in French intensive enclosed rabbit farms since the beginning of 1997. Common clinical signs are mild watery diarrhoea with considerable distension of the abdomen. At necropsy, a significant dilation of the stomach and small intestine without gross evidence of acute or chronic enteric lesions (inflammation or congestion) was observed. The purpose of this study was to describe the anatomopathologic changes concerning the small intestine and those concerning the blood profile, in experimentally infected rabbits. In a first part of the experiment, thirty animals were inoculated with a reference inoculum and five were kept as controls for clinical signs examination and histopathological study. In a second part, 17 out of the inoculated rabbits and the 5 controls animals were randomly assigned to blood testing. Microscopic lesions were studied in sections from the different parts of the small intestine (duodenum, jejunum and ileum) by light microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The histological findings revealed only limited inflammation in inoculated animals. Major villous changes were atrophy, fusion, destruction and loss of epithelial cells. In inoculated rabbits, the congestion and dilation of blood vessels of jejunal lamina propria were significantly higher than in control animals (P<0.005). There was significantly more (P<0.05) apoptosis of cells of the jejunal epithelium in inoculated rabbits than in control animals. Infiltration of polymorphonuclear neutrophiles was observed into the jejunal or ileal tunica muscularis. SEM performed on the intestinal tract of 15 inoculated rabbits revealed blankets and globular particles of mucus associated with numerous bacteria on jejunum and ileum villi. This was; not observed in the intestinal tract of control rabbits. Bacteria were found adhering to the epithelial surface and inside intestinal epithelial cells in a few animals by TEM and by light microscopy after Warthin-Starry staining. None of the bacteria isolated from the intestinal mixed contents and cultivated on usual media, are commonly known as rabbit's pathogens. Regarding the haernatological profile, neutrophil counts significantly increased (P<0.05) and lymphocyte counts significantly decreased (P<0.01), in inoculated rabbits compared to those of the control group. [less ▲]

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See detailExperimentally-informed Mathematical Modelling of Oxygen Tension, Cell Viability and Proliferation in Fibrin Hydrogels
Demol, Jan; Lambrechts, Dennis; Geris, Liesbet ULg et al

in Proceedings of the TERMIS-EU meeting (2010, June)

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See detailExperimentation and Simulation of a Small-Scale Adsorption Cooling System in Temperate Climate
Thomas, Sébastien ULg; Hennaut, Samuel ULg; Maas, Stefan et al

in Energy Procedia (2012), 30

This paper focuses on the analysis of the operation of a solar cooling system based upon an adsorption chiller. The air-conditioned building studied is a laboratory located in a temperate climate region ... [more ▼]

This paper focuses on the analysis of the operation of a solar cooling system based upon an adsorption chiller. The air-conditioned building studied is a laboratory located in a temperate climate region (Belgium). The monitoring reveals thermal and electrical coefficient of performance (COP) of the cooling system for different time scale (10s to 1 month). The whole system including solar collectors, adsorption machine, recooling unit and hot storage is simulated. The models are then confronted to the measurements. Measurement period is shared between 2011 and 2012. Enhancements have been achieved during winter 2011 to have a more efficient system operation. The aim of this experimental work is to describe, for both measurement periods, the influence of operating conditions on the energy efficiency (thermal behavior and electrical consumption). On the simulation point of view, the main objective is to find accurate models for all the components. The adsorption chiller model is not yet precise enough to evaluate the performance of solar cooling in other conditions. [less ▲]

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See detailExpérimentation des « Brain Break » dans l’enseignement primaire. Avis des élèves
Cloes, Marc ULg; Mornard, Manhattan ULg

in Science & Sports (2014, October 17), 29(Hors-série 1), 52

L'école est identifiée comme un des piliers de la lutte contre la sédentarité des jeunes. Une société américaine (HOPSports) conçoit et diffuse des séquences de quelques minutes qui mettent en scène des ... [more ▼]

L'école est identifiée comme un des piliers de la lutte contre la sédentarité des jeunes. Une société américaine (HOPSports) conçoit et diffuse des séquences de quelques minutes qui mettent en scène des personnages, réalisant des activités à imiter en classe: les 'Brain Breaks' (BB). Ces videos ont été proposées pendant trois mois dans deux écoles primaires de la région liégeoise. L'opinion des élèves est positive mais leurs attitudes à l'égard de l'école et de l'activité physique ne change guère. [less ▲]

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See detailExpérimentation médicale sur l'être humain. Propositions pour un cadre législatif.
Palermini, Patricia ULg; Delfosse, Marie-Luce

in Revue de Droit de la Santé = Tijdschrift voor Gezondheidsrecht (1997), (5), 333-344

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See detailExpérimentations manuscrites : lettres, albums et livres d’or
Saint-Amand, Denis ULg

Conference (2013, October 16)

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See detailLes expérimentations télématiques en Europe: rôle et limites de l'intervention publique
Pichault, François ULg

in Laperrière, R.; Claret, H.; Péladeau, P. (Eds.) Une démocratie technologique? (1988)

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See detailExperimenteel onderzoek naar het brandgedrag van kolommen in gewapend beton
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg; Baus, Raymond et al

in Infrastructuur in het Leefmilieu (1995), 6

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See detailExpérimenter, tout un programme
Hindryckx, Marie-Noëlle ULg; Poffé, Corentin ULg

in Cornet, Jacques; Daro, Sabine (Eds.) Voir double pour mieux comprendre (2015)

Detailed reference viewed: 12 (1 ULg)