References of "Denoël, Vincent"
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See detailFactors to be considered to perform a kinematic evaluation of the tennis serve
Tubez, François ULiege; Forthomme, Bénédicte ULiege; Croisier, Jean-Louis ULiege et al

in Journal of Medecine and Science in Tennis (2017), 22

With the 2D video cameras and later the appearance of 3D measurement methods, the tennis serve has been increasingly studied. In order to improve the biomechanical evaluation of the tennis serve. Our goal ... [more ▼]

With the 2D video cameras and later the appearance of 3D measurement methods, the tennis serve has been increasingly studied. In order to improve the biomechanical evaluation of the tennis serve. Our goal is to provide a comprehensive view of the major factors of an evaluation protocol. [less ▲]

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See detailReal-scale observations of vortex induced vibrations of stay-cables in the boundary layer
Denoël, Vincent ULiege; Andrianne, Thomas ULiege

in Procedia Engineering (2017), 199

Abstract This paper shows some records and analysis of evidences of vortex induced vibrations of very long stay cables in the atmospheric boundary layer. The considered structure is a 254-m high ... [more ▼]

Abstract This paper shows some records and analysis of evidences of vortex induced vibrations of very long stay cables in the atmospheric boundary layer. The considered structure is a 254-m high telecommunication antenna whose structural system is made of a light flexible metallic truss, approx. 10×10m square, which is stayed at five different levels by a set of 20 pairs of stay-cables. The exposure of this antenna is category I with a low-turbulence wind flow which results in a high sensitivity to vortex induced vibrations. The fundamental frequency of the longest cable is 0.3 Hz so that several dozens of regularly spaced natural frequencies could be observed with a sampling frequency of 500 Hz. Sufficiently long recordings allowed to distinctly observe the separate peaks corresponding to the various modes of the cables. Among them many are excited by the detachment of vortices, taking place at different frequencies (because of different cable diameters and the change of wind velocity along the height of the antenna) in the range 35-55 Hz. Referring to the so-called spectral model proposed by Vickery and Clark, the detachment of vortices takes place in a certain bandwidth, whose extent is not completely understood yet. This bandwidth is clearly observed with our long stay-cables because of the large density of mode shapes in the range [0, 200] Hz and because of their regular spacing in the spectral domain. To the author’s knowledge this constitutes a first attempt at identifying this parameter of the Vickery and Clark model from full-scale measurements. [less ▲]

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See detailReal-scale observations of vortex induced vibrations of stay-cables in the boundary layer
Denoël, Vincent ULiege; Andrianne, Thomas ULiege

in Proceedings of the Xth International conference on Structural Dynamics (2017)

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See detailIdentification of equivalent mechanical properties for unreinforced masonry walls
Mordant, Christophe; Degée, Hervé ULiege; Denoël, Vincent ULiege

in International Journal of Masonry Research and Innovation (2017), 2(4), 274-299

Transverse vibrations of beams are an interesting topic for numerous engineering fields. The equations of motion develop under various assumptions and associate a frequency equation. This paper expresses ... [more ▼]

Transverse vibrations of beams are an interesting topic for numerous engineering fields. The equations of motion develop under various assumptions and associate a frequency equation. This paper expresses the frequency equation for two specific models, using the Timoshenko beam theory. The first model is a typical cantilever beam with an additional mass attached to the free end. The second model considers a beam partially clamped at the base and with an elastic connection of the additional mass to the free end. The relevance of the used theory is discussed and the importance of each term of the equation is studied. These models find applications in unreinforced masonry. They are indeed fitted to identify, from white noise tests, equivalent mechanical properties of unreinforced load-bearing clay masonry walls including soundproofing devices in the perspective of modelling these elements with a macro-scale approach. Discrepancies with respect to current standards are underscored. [less ▲]

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See detailSTOCHASTIC STABILITY OF A TOWER CRANE UNDER GUSTY WINDS
Vanvinckenroye, Hélène ULiege; Andrianne, Thomas ULiege; Denoël, Vincent ULiege

in Proceedings of the 7th European-African Conference on Wind Engineering (2017)

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See detailA modal analysis method to identify tension in stay-cable equipped with additional unknown masses in the span
Denoël, Vincent ULiege

in Proceeding of the International Symposium on the Dynamics and Aerodynamics of Cables (2017)

This paper presents a low-order model to identify the tension in a cable with additional masses in the span. The method is applicable in a general sense but is illustrated with low Irvine parameters ... [more ▼]

This paper presents a low-order model to identify the tension in a cable with additional masses in the span. The method is applicable in a general sense but is illustrated with low Irvine parameters (slightly extensible) cables. The number of masses is arbitrary; however the method performs best with a limited number of masses, say less than 12 or 15; otherwise a Galerkin scheme would perform equally well. The paper illustrates the method with numerically simulated data. Validation with field measurement is provided in the oral presentation. [less ▲]

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See detailA design methodology for lattice and tensegrity structures based on a stiffness and volume optimization algorithm using morphological indicators
Latteur, Pierre ULiege; Feron, Jonas; Denoël, Vincent ULiege

in International Journal of Space Structures (2017), 32(3-4), 226-243

This article presents a design methodology based on a stiffness and volume optimization algorithm for three-dimensional nonlinear hyperstatic and pre-stressed structures composed of elements only ... [more ▼]

This article presents a design methodology based on a stiffness and volume optimization algorithm for three-dimensional nonlinear hyperstatic and pre-stressed structures composed of elements only subjected to axial forces, with a special emphasis on tensegrity structures. The algorithm is based on dimensionless numbers called morphological indicators that allow finding, within a given family of structures, the geometry related to a maximum stiffness or a minimum volume of materials or the best ratio between stiffness and volume. The algorithm takes into account the buckling of the struts and different materials for cables and struts. This article first demonstrates the optimization algorithm and then gives numerical confirmations and examples. [less ▲]

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See detailAnalyse des Structures II
Denoël, Vincent ULiege

Learning material (2017)

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See detailAssessment of extreme value overestimations with equivalent static wind loads
Blaise, Nicolas ULiege; Andrianne, Thomas ULiege; Denoël, Vincent ULiege

in Journal of Wind Engineering & Industrial Aerodynamics (2017)

The wind-resistant design using equivalent static wind loads is convenient for structural engineers. This paper studies the reliability of such an approach in the case of non-Gaussianities in both ... [more ▼]

The wind-resistant design using equivalent static wind loads is convenient for structural engineers. This paper studies the reliability of such an approach in the case of non-Gaussianities in both aerodynamic pressures and responses. These non-Gaussianities are responsible for overestimations of envelope values and may result in uneconomical designs, if not appropriately understood, assessed and addressed. In this study, it is shown that the equivalent static wind loads defined with the Conditional Expected Load method, which extends the physical meaning of the Load-Response Correlation approach in a non-Gaussian framework, improves the issue of overestimations of envelope values. Several envelopes of structural responses are considered: the mean of extremes and the 86% quantiles of extremes, together with two reference periods (10 min and 1 h). Extensive wind tunnel measurements have been collected, which correspond to 371 h full scale. This study is undertaken for quasi-static analysis of structures and is illustrated with a low-rise building. [less ▲]

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See detailAlgorithm for Temporal Gait Analysis Using Wireless Foot-Mounted Accelerometers
Boutaayamou, Mohamed ULiege; Denoël, Vincent ULiege; Bruls, Olivier ULiege et al

Book published by Springer (2017)

We present a new signal processing algorithm that extracts five gait events: heel strike, toe strike, heel-off, toe-off, and heel clearance from only two accelerometers attached on the heels of the ... [more ▼]

We present a new signal processing algorithm that extracts five gait events: heel strike, toe strike, heel-off, toe-off, and heel clearance from only two accelerometers attached on the heels of the subjects usual shoes. This algorithm first uses a continuous wavelet-based segmentation that parses the signal of consecutive strides into motionless periods defining relevant local acceleration signals. Then, the algorithm uses versatile techniques to accurately extract the five gait events from these local acceleration signals. We validated, on a stride-by-stride basis, the extraction of these gait events by comparing the results with reference data provided by a kinematic 3D analysis system and a video camera. The accuracy and precision achieved by the extraction algorithm for healthy subjects, the reduced number of accelerometer units required, and the validation results obtained, encourage us to further study this system in pathological conditions. [less ▲]

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See detailFast In-Plane Dynamics of a Beam with Unilateral Constraints
Liakou, Anna; Denoël, Vincent ULiege; Detournay, Emmanuel

in Journal of Engineering Mechanics (2017), 0(0), 04016116

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See detailResponse to the discussion on “Reconstruction of the envelope of non-Gaussian structural responses with principal static wind loads by N. Blaise, T. Canor and V. Denoël”
Blaise, Nicolas; Canor, Thomas; Denoël, Vincent ULiege

in Journal of Wind Engineering & Industrial Aerodynamics (2017)

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See detailReproducibility of a tennis serve protocol
Tubez, François ULiege; FORTHOMME, Bénédicte ULiege; Croisier, Jean-Louis ULiege et al

Conference (2016, July 08)

INTRODUCTION Serve in modern tennis game is a real offensive weapon for players. In kinematic analysis, it is the most studied stroke of this game because it is the only stroke played in a closed skill ... [more ▼]

INTRODUCTION Serve in modern tennis game is a real offensive weapon for players. In kinematic analysis, it is the most studied stroke of this game because it is the only stroke played in a closed skill. Players have a maximum of control on this stroke. It is unclear whether 3D kinematic tests are reproducible for the same player under identical conditions and if a familiarization session is necessary. In practice, with professional players, who have little time available to perform tests, familiarization sessions are difficult. The aim of our study is to measure the reproducibility of a 3D serve protocol test. METHODS Nine tennis players (righties, regional level, 20 ± 2 years) were asked to hit first flat serves in a 1 m² area placed on the "T" zone of deuce diagonal of the tennis court. Two identical tests are performed one week apart. For each test, we selected the three best serves of the 25 trials (with the highest speed and the highest accuracy). Kinetics measurements were performed using a 3D analysis system (Codamotion), a force platform (Kistler) and a radar gun. 28 markers were placed on the players’ bodies to measure kinematics of the movements: ankles, knees, hips, trunk, shoulder, elbow and wrist dominant side. We measured ball speed, leg drive, linear velocity of the racket and joints, joints range of motion and maximum angular velocities at different positions (armed, maximum external rotation and impact) (1). RESULTS All analyzed parameters (linear speeds of racket and joints, leg drive force, joint angles and angular velocities) are reproducible with exception of a small part of them. Our study shows that 5,7% (7 of 122 measurements) joint position parameters and 8,3% (4 of 48 measures) angular velocity parameters are not reproducible from a session to another. DISCUSSION Various errors sources encountered in 3D analysis can justify the presence of non-reproducible parameters (2-3). However, after this work, we can state that the established protocol provides reproducible results when analyzing the tennis serve. [less ▲]

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See detailApplications of the multiple timescale spectral analysis in wind engineering
Denoël, Vincent ULiege

in Zingoni, Alphose (Ed.) Proceedings of the Sixth International Conference on Structural Engineering, Mechanics and Computation (2016, July)

The random response of civil engineering structures to the buffeting action of wind loads is typically composed of several components, usually referred to as the background component, in the low fre ... [more ▼]

The random response of civil engineering structures to the buffeting action of wind loads is typically composed of several components, usually referred to as the background component, in the low fre- quency zone and the resonant component(s) in the neighborhood of modal natural frequencies. It has become customary to study separately and add the contributions of these components to the total response, at least as far as the second order response (variance of structural responses) is concerned. Such a decomposition exists but is less usual for the computation of covariances of modal coordinates or of structural displacements, which are in turn necessary for the determination of internal stresses. The question of such a decomposition also holds for nonlinear systems, or even for the higher statistical moments of a linear structural system, should the response be non Gaussian. With very wide ranges of applicability, the Multiple Timescale Spectral Analysis summarizes under a unified framework recent works aiming at the development of such decompositions. This paper briefly pictures this particular theory based on perturbation methods, and provides illustrations of its applicability to the problems cited above. [less ▲]

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See detailEulerian Formulation of Elastic Rods
Huynen, Alexandre ULiege; Detournay, Emmanuel; Denoël, Vincent ULiege

in Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences (2016), 472(2190),

In numerous biological, medical and engineering applications, elastic rods are constrained to deform inside or around tube-like surfaces. To solve efficiently this class of problems, the equations ... [more ▼]

In numerous biological, medical and engineering applications, elastic rods are constrained to deform inside or around tube-like surfaces. To solve efficiently this class of problems, the equations governing the deflection of elastic rods are reformulated within the Eulerian framework of this generic tubular constraint defined as a perfectly stiff canal surface. This reformulation hinges on describing the rod deformed configuration by means of its relative position with respect to a reference curve, defined as the axis or spine curve of the constraint, and on restating the rod local equilibrium in terms of the curvilinear coordinate parameterizing this curve. Associated with a segmentation strategy, which partitions the global problem into a sequence of rod segments either in continuous contact with the constraint or free of contact (except for their extremities), this approach not only trivializes the detection of new contacts but also suppresses the isoperimetric constraints resulting from the self-feeding feature of these elementary problems and the imposition of the rod position at the extremities of each rod segments. [less ▲]

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See detailConditional expected static wind loads
Blaise, Nicolas ULiege; Andrianne, Thomas ULiege; Denoël, Vincent ULiege

in In Vento 2016 (2016)

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See detailReconstruction of the envelope of non-Gaussian structural responses with principal static wind loads
Blaise, Nicolas ULiege; Canor, Thomas; Denoël, Vincent ULiege

in Journal of Wind Engineering & Industrial Aerodynamics (2016), 149

In current practice, structural engineers commonly focus on the wind-resistant design by means of static wind loads. In case of non-Gaussianities, there is room for improvement to properly derive these ... [more ▼]

In current practice, structural engineers commonly focus on the wind-resistant design by means of static wind loads. In case of non-Gaussianities, there is room for improvement to properly derive these static loads. First, this paper extends in a non-Gaussian context the concept of the load-response correlation (LRC) method establishing equivalent static wind loads (ESWLs). This is done by a proper recourse to the new concept of conditional expected static wind load and a proposed bicubic model for the joint and conditional distribution functions. Second, this paper investigates the envelope reconstruction problem targeting the efficient reconstruction of the envelope values of a set of non-Gaussian structural responses by means of principal static wind loads (PSWLs). They have been introduced in a Gaussian context and are obtained by a singular value decomposition of ESWLs. This paper addresses the extension of PSWLs to non-Gaussian structural responses, as well. The developments apply to structures with a linear behavior and subjected to an aerodynamic pressure field exhibiting mildly to strongly non-Gaussian features. In this context, the well-known load-response correlation and conditional sampling methods are used for comparisons. This study is undertaken for quasi-static analysis of structures and is illustrated on a low-rise building. [less ▲]

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See detailStochastic stability of a rotational oscillator under gusty winds
Vanvinckenroye, Hélène ULiege; Denoël, Vincent ULiege

in Proceedings of the XIV Conference of the Italian Association for Wind Engineering (2016)

This work studies the rotational stability of an oscillator in a random wind velocity field. Its susceptibility to autorotation is assessed by the time necessary to reach a given energy barrier departing ... [more ▼]

This work studies the rotational stability of an oscillator in a random wind velocity field. Its susceptibility to autorotation is assessed by the time necessary to reach a given energy barrier departing from an initial energy level. This first passage time problem is solved by replacing the actual power spectral density of the loading by an equivalent δ-correlated noise. [less ▲]

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