References of "Golinval, Jean-Claude"
     in
Bookmark and Share    
Full Text
See detailExperimental identification of a non-linear beam, proper othogonal decomposition
Lenaerts, Vincent; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in International Conference on Structural Systems Identification, Kassel, 2001 (2001)

The aim of the paper is twofold

Detailed reference viewed: 11 (0 ULg)
Full Text
See detailStrategies for Distributed Piezoelectric Actuator / Sensor Placement by Noise Effect Minimisation and Modal Controllability / Observability
De Boe, Pascal; Simon, Daniel; Golinval, Jean-Claude ULg

Conference given outside the academic context (2000)

This paper investigates the problem of placement procedure for distributed piezoelectric actuators and sensors. Two placement techniques are proposed. The first one is based on the controllability and ... [more ▼]

This paper investigates the problem of placement procedure for distributed piezoelectric actuators and sensors. Two placement techniques are proposed. The first one is based on the controllability and observability Grammians of the system expressed in a modal state-space coordinates. The controllability Grammian is then able to quantify how structural modes are controllable with a set of predefined actuators, while the observability Grammian expresses how much structural modes can be observed from a set of predefined sensors. The second placement technique is based on the selection of the best sensor sets which, for each selected structural modes, have the best signal to noise ratio. The sensor selection is performed by inspecting the Fisher information matrix. The number of sensors is then reduced, in an iterative manner, by eliminating locations that do not contribute significantly to the linear independence of the target modal partitions. [less ▲]

Detailed reference viewed: 29 (2 ULg)
Full Text
See detailModal identification in presence of noise using an optimization approach
Thonon, Carole; Golinval, Jean-Claude ULg

Conference given outside the academic context (2000)

This paper deals with the problem of modal parameter identification when the measurements are perturbed by unknown but bounded noise. It is well known that the classical Total Least Square (TLS) solution ... [more ▼]

This paper deals with the problem of modal parameter identification when the measurements are perturbed by unknown but bounded noise. It is well known that the classical Total Least Square (TLS) solution is the most accurate one, but that it is quite sensitive to data perturbations. This feature is a big drawback since it is desirable that the estimated modal parameters should not vary when perturbations on measurements change. An optimisation technique suited to so-called second-order cone programs [2] is proposed and tested. This method sets the identification problem in a MIN-MAX formulation [1] and uses an iterative interior-point primal-dual potential reduction algorithm [3, 4]. The residual error is first maximised over the set of possible perturbations leading thus to a worst-case residual error. Then, it is minimised over the set of identification variables. This procedure guarantees the robustness of the solution in the sense that no perturbation of the considered set could make the residual error bigger. This robustness is obtained to the detriment of an absolute accuracy. A good compromize between robustness and accuracy may be found through the prior resolution of the associate TLS problem. The optimisation program is tested in the case of a clamped-free beam for which closed-form solutions are available. A comparison with the TLS solution is also performed. [less ▲]

Detailed reference viewed: 10 (0 ULg)
Full Text
See detailActuator / Sensor Placement and Experimental Modal Analysis on Piezo-Structures
De Boe, Pascal; Golinval, Jean-Claude ULg

Conference given outside the academic context (2000)

Few works have been performed in the field of experimental modal analysis by means of piezoelectric distributed elements. Piezoelectric laminates, initially intended for the monitoring and the control of ... [more ▼]

Few works have been performed in the field of experimental modal analysis by means of piezoelectric distributed elements. Piezoelectric laminates, initially intended for the monitoring and the control of smart structures, could also be dedicated to the experimental modal identification of an open-loop structure. A pole-residue development of the open-loop piezo-structure shows that conventional algorithms and a piezoelectric pseudo-collocated actuator/sensor may be used to estimate the mechanical modal parameters. When an initial mathematical model of the structure is available, the 'best' excitation position is determined by checking the H2 norm of the transfer function of the fully observed system. The same methodology can be applied for the selection of the monitoring locations. In most cases, experimental testing with the selected sensors set, gives acceptable information to identify target modes. These data, coupled with electrical sensing at the piezoelectric element level, can then be used to perform the modal analysis of the piezo-structure. A light clamped-free plate instrumented with piezo-laminates is used to illustrate this experimental approach. [less ▲]

Detailed reference viewed: 61 (0 ULg)
Full Text
See detailIdentification of Electromechanical Coupling in Piezo-Structures
De Boe, Pascal; Golinval, Jean-Claude ULg

Conference given outside the academic context (2000)

An identification method based on a structural model updating procedure may be used to improve the knowledge of a piezoelectric tested structure and to determine the coupling coefficients of the ... [more ▼]

An identification method based on a structural model updating procedure may be used to improve the knowledge of a piezoelectric tested structure and to determine the coupling coefficients of the piezoelectric material. This procedure starts with the modal analysis of the open-loop instrumented structure. Let the target modes be a subset of the model modes; a selection of sensor (generally accelerometers) locations is then performed by determining the smaller subset such that the H2 modal norm is as close as possible to the modal norm of the original full set. In most cases, experimental testing with the selected sensor set will give acceptable information to identify target modes. These data, coupled with electrical sensing at the piezoelectric element level, will then be used to perform modal analysis of the piezo-structure. A pole-residue development of the open-loop piezo-structure shows that conventional algorithms may be used to estimate the mechanical modal parameters and the electromechanical coupling matrix. The second step of the procedure is to perform model updating itself. The initial finite element piezoelectric model will be improved stiffness corrections to the global stiffness matrix.. The corrections are split in their mechanical and electromechanical contributions. It is then possible to separate mechanical modelling errors from electromechanical coupling errors. The problem becomes a classical model updating problem which may be solved using well established techniques. This will result not only in a model behaving like the measures, but also in an improved knowledge of the structure behaviour without loosing physical insight. From a numerical point of view, it will be shown that ill-conditioning inherent to the presence of piezoelectric elements presents some difficulties at different steps of the model correction procedure. A clamped-free plate instrumented with piezo-laminates is used to illustrate the model updating approach. The selection of measurement points, using the modal norm criteria, is also presented. Experimental identification data will then be used as inputs for the model correction procedure and the behaviour of the updated model will be compared with the initial model dynamics. [less ▲]

Detailed reference viewed: 44 (3 ULg)
Full Text
See detailARMAV Model Technique for System Identification and Damage Detection
BODEUX, Jean-Bernard; Golinval, Jean-Claude ULg

Conference given outside the academic context (2000)

This paper presents an application of ARMAV models in the fields of system identification and damage detection. It is shown how to estimate the modal parameters as well as their uncertainties only on the ... [more ▼]

This paper presents an application of ARMAV models in the fields of system identification and damage detection. It is shown how to estimate the modal parameters as well as their uncertainties only on the basis of output measurements, simply assuming that the excitation is a zero-mean stationary Gaussian white noise. The uncertainties estimation can be used for damage detection. Knowing the modal parameters and their uncertainties, it is possible to assess whether changes of modal parameters are caused by e.g. a damage or simply by estimation inaccuracies. The identification and damage detection method is illustrated on the “Steel-Quake” benchmark proposed in the framework of COST Action F3 “Structural Dynamics”. This structure is used at the Joint Research Centre in Ispra (Italy) to test steel buildings performance during earthquakes. The obtained results indicate the effectiveness of the method in estimating modal characteristics and their uncertainties. [less ▲]

Detailed reference viewed: 45 (0 ULg)
Full Text
See detailDetection, localisation and identification of nonlinearities in structural dynamics
Lenaerts, Vincent; Kerschen, Gaëtan ULg; Trandafilova, Irina et al

in International Conference on noise and vibration Engineering, Leuven, 2000 (2000)

This paper discusses procedures for nonlinearity detection, localisation and identification in structures from time domain vibration measurements. The detection and the localisation techniques use pattern ... [more ▼]

This paper discusses procedures for nonlinearity detection, localisation and identification in structures from time domain vibration measurements. The detection and the localisation techniques use pattern recognition tools and are based on a dissimilarity measure between the signals coming from a linear structure and the corresponding nonlinear one. The detection procedure distinguishes between linear structures and structures with a nonlinearity employing nearest neighbour techniques. The localisation procedure combines substructuring with a nonlinearity detection procedure. This technique is useful for cases of local nonlinearity, when its localisation can be of value for the consequent understanding and modelling of the structure. The identification procedure makes use of the Karhunen-Loeve transform, known also as Proper Orthogonal Decomposition (POD). It is a powerful tool for solving inverse problems in nonlinear structural dynamics. The identification procedure works on the basis of the minimisation of a difference function between the experimental and the simulated proper orthogonal modes (POM). The proposed techniques are demonstrated on a beam test case with a local damping type nonlinearity. [less ▲]

Detailed reference viewed: 50 (5 ULg)
Full Text
See detailProper Orthogonal Decomposition and Model Reduction of Nonlinear Systems
Kerschen, Gaëtan ULg; Lenaerts, Vincent; Golinval, Jean-Claude ULg

in European Cost F3 Conference on system Identification & Structural Health Monitoring, Madrid, 2000 (2000)

This work deals with the application of the proper orthogonal decomposition (POD) to structural dynamics. On one hand, a physical interpretation of the proper orthogonal modes (POM) is given using the ... [more ▼]

This work deals with the application of the proper orthogonal decomposition (POD) to structural dynamics. On one hand, a physical interpretation of the proper orthogonal modes (POM) is given using the singular value decomposition (SVD). It is shown that the POM converge to the normal modes under some circumstances. On the other hand, the POM are exploited for model reduction purposes. The efficiency of the reduced model for the prediction of the response is tested on a nonlinear beam. The comparison with another reduced model obtained via the normal modes of the linearised system points out that the POM are optimal for the reconstruction of the dynamics of a system. [less ▲]

Detailed reference viewed: 39 (1 ULg)
Full Text
See detailParameter identification of nolinear mechanical systems using POD
Lenearts, Vincent; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in 18th International Modal Analysis Conference, San Antonio, 2000 (2000)

Proper Orthogonal Decomposition (POD), also known as Karhunen-Loeve decomposition, or principal components analysis (PCA), is emerging as a useful experimental tool in dynamics and vibrations. The POD is ... [more ▼]

Proper Orthogonal Decomposition (POD), also known as Karhunen-Loeve decomposition, or principal components analysis (PCA), is emerging as a useful experimental tool in dynamics and vibrations. The POD is a statistical pattern analysis technique for finding the dominant structures in an ensemble of spatially distributed data. These structures can be used as an orthogonal basis for efficient representation of the ensemble. The Proper Orthogonal Modes (POM) have been interpreted mainly as empirical system modes. They have been shown to represent the optimal distributions of kinetic energy or power, and the proper orthogonal values indicate the power associated with these principal distributions. We investigate the use of the proper orthogonal modes of displacements for the identification of parameters of nonlinear dynamical structures with an optimization procedure based on the difference between the experimental and simulated POM. A numerical example of a beam with a local nonlinear component will illustrate the method. [less ▲]

Detailed reference viewed: 34 (4 ULg)
See detailAerodynamic and Mechanical Design of Compressor Blades Including Static Analysis
Adam, Olivier; Marin, Frédéric; Essers, Jean-André ULg et al

in Proceedings od the 3rd World Congress of Structural and Multidisciplinary Optimization (1999, May)

Detailed reference viewed: 70 (4 ULg)
Full Text
See detailDamage Detection Using Model Updating and Identification Techniques
Pascual, Rodrigo; Trendafilova, Irina; Golinval, Jean-Claude ULg et al

Conference given outside the academic context (1999)

Detailed reference viewed: 9 (0 ULg)
Full Text
See detailOn-line Damage Assessment Using Operating Deflection Shapes
Pascual, Rodrigo; Golinval, Jean-Claude ULg; RAZETO, Mario

Conference given outside the academic context (1999)

Detailed reference viewed: 12 (0 ULg)
Full Text
See detailFinite Element Model Updating Based On Holographic and Speckle Interferometry Measurements: Rapport VIA-25
Simon, Daniel; Golinval, Jean-Claude ULg

Conference given outside the academic context (1999)

Optical measurement techniques look very promising for finite element (F.E.) model updating or error localisation of plate-like structures in the field of structural dynamics. The purpose of this paper is ... [more ▼]

Optical measurement techniques look very promising for finite element (F.E.) model updating or error localisation of plate-like structures in the field of structural dynamics. The purpose of this paper is to investigate a way to better exploit the high spatial resolution inherent to these techniques in order to correct FE mesh discretisation errors and/or model parameter errors. An important assumption in F.E. model error detection is first to consider the initial mesh as sufficiently fine to well represent the measured (displacement or stress) field. In the case of model updating, the adjustment of the model is performed by minimising the difference between the outputs of the model and the exact solution with respect to design parameters. In the case of FE mesh adaptation, the exact solution has to be estimated whereas in the case of model parameter errors, it is directly measured. The idea developed in this paper is to take advantage of the high spatial resolution offered by optical techniques to calculate successively two error estimators using only measurements. The experimental field is first used for the detection of singular regions corresponding to high gradients. This estimator indicates the regions where a mesh refinement is required. Thus a second estimator is calculated and used for parameter error detection. [less ▲]

Detailed reference viewed: 22 (1 ULg)
Full Text
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 ▲]

Detailed reference viewed: 23 (1 ULg)
Full Text
Peer Reviewed
See detailPunch Press Vibration Isolation: a Case History
Golinval, Jean-Claude ULg; Géradin, Michel ULg

in European Journal of Mechanical and Environmental Engineering (1999), 44(3), 141-145

Detailed reference viewed: 29 (0 ULg)
Full Text
See detailIdentification of the Mechanical and Piezoelectric Parameters of a Massively Piezoelectric Structure
De Boe, P.; Pascual, R.; Golinval, Jean-Claude ULg

Conference given outside the academic context (1998)

Detailed reference viewed: 12 (2 ULg)
Full Text
See detailOn the Reliability of Error Localization Indicators
Pascual, Rodrigo; Golinval, Jean-Claude ULg; Razeto, Mario

Conference given outside the academic context (1998)

Detailed reference viewed: 12 (1 ULg)
Full Text
See detailModel Updating Using Operating Deflection Shapes
Pascual, Rodrigo; Golinval, Jean-Claude ULg; Razeto, Mario

Conference given outside the academic context (1998)

Detailed reference viewed: 43 (0 ULg)
Full Text
Peer Reviewed
See detailDeveloppement d'une méthodologie d'optimisation aérodynamique et mécanique d'aubes de compresseurs
Adam, O.; Marin, F.; Thonon, C. et al

in RFM : Revue Française de Mécanique (1998), 4

Le projet décrit dans cet article a pour but de réaliser le dimensionnement des aubages d'un compresseur axial; pour ce faire, des codes de calcul aérodynamique et mécanique sont intégrés dans un ... [more ▼]

Le projet décrit dans cet article a pour but de réaliser le dimensionnement des aubages d'un compresseur axial; pour ce faire, des codes de calcul aérodynamique et mécanique sont intégrés dans un processus d'optimisation globale. Le transfert de données entre les différents modules utilisés est pris en charge par un logiciel gestionnaire de tâches, sur lequel est axée la méthode. Les codes aérodynamiques, basés sur l'approche classique quasi-tridimensionnelle, combinent une simulation d'écoulement dans le plan méridien ainsi qu'une succession d'écoulements en grilles d'aubes. Les codes mécaniques permettent une analyse à la fois statique et dynamique des aubages ; on notera en outre la possibilité de leur adjoindre des calculs d'impact ou de vérification de la durée de vie. Dans son état actuel, le code général permet d'optimiser la masse ou le rendement d'un étage de compression sur la base d'un calcul aérodynamique dans le plan méridien et d'une vérification des marges fréquentielles. [less ▲]

Detailed reference viewed: 161 (14 ULg)