Papers by Patrick Guillaume
IEEE Transactions on Power Delivery, 2000
AbstractA mobile substation is a fully equipped electrical sub-station mounted on a semitrailer.... more AbstractA mobile substation is a fully equipped electrical sub-station mounted on a semitrailer. The substation components are ideally mounted in their operational position on the semitrailer. The equipment must be fixed considering the space limitation, in-sulation ...
Biosystems Engineering, 2003
It is a well-known fact that the linear dynamic behaviour of mechanical structures can be studied... more It is a well-known fact that the linear dynamic behaviour of mechanical structures can be studied by modelling the relation between force(s) [input(s)], acting on the structure, and their resulting structural vibration response(s) [output(s)]. For industrial structures, in their real in-operation conditions, it often becomes hard (or impossible) to experimentally measure the excitation. For this reason, attention has been paid to the development of system identification techniques that work on a basis of response data only. The use of such techniques allows the identification of modal models for structures excited by unknown ambient noise and vibration. In this contribution, controlled vibration experiments were conducted on a sprayer boom that was mounted on a tractor. A comparison was made between the results of a classic input-output and output-only modal analysis based on maximum likelihood system identification techniques. Due to the interaction between the dynamic artificial excitation device and the test structure, the output-only approach modelled the excitation device together with the test structure. The identified output-only modal parameters were validated by direct comparison to the identification results obtained on a classic input-output transfer function data set between the generator input signal and the structural responses.
Google, Inc. (search). SIGN IN SIGN UP. Design of broadband excitation signals. Authors: Johan Sc... more Google, Inc. (search). SIGN IN SIGN UP. Design of broadband excitation signals. Authors: Johan Schoukens, Patrick Guillaume, Rik Pintelon, Published in: · Book. Perturbation signals for system identification. Prentice Hall International (UK) Ltd. ...
Journal of the IEST, 2003
In the assessment of the structural integrity and launch-environment survivability of satellite s... more In the assessment of the structural integrity and launch-environment survivability of satellite structures, dynamic mathematical models are used for load prediction. These analytical models are test-verified by a modal survey test. Once the vibration environment is ...
Wind Energy
Offshore wind turbines are complex structures, and their dynamics can vary significantly because ... more Offshore wind turbines are complex structures, and their dynamics can vary significantly because of changes in operating conditions, e.g., rotor-speed, pitch angle or changes in the ambient conditions, e.g., wind speed, wave height or wave period. Especially in parked conditions, with reduced aerodynamic damping forces, the response due to wave actions with wave frequencies close to the first structural resonance frequencies can be high. Therefore, this paper will present numerical simulations using the HAWC2 code to study an offshore wind turbine in parked conditions. The model has been created according to best practice and current standards based on the design of an existing Vestas V90 offshore wind turbine on a monopile foundation in the Belgian North Sea. The damping value of the model's first fore-aft mode has been tuned on the basis of measurements obtained from a long-term ambient monitoring campaign on the same wind turbine. Using the updated model of the offshore wind ...
Offshore wind turbines are complex structures and their dynamics can vary significantly due to ch... more Offshore wind turbines are complex structures and their dynamics can vary significantly due to changes in operating conditions e.g. changing rotor-speed, changing pitch angle or changing ambient conditions e.g. change in wind speed, wave height or wave period. Especially in parked conditions, with reduced aerodynamic damping forces, the response due to wave actions with wave frequencies close to the first structural resonance frequencies can be high. Therefore, this paper will present numerical simulations using the HAWC2 code to study an offshore wind turbine in parked conditions. The model has been created according to best practice and current standards based on the design of an existing Vestas V90 offshore wind turbine on a monopile foundation in the Belgian North-Sea. The damping value of the first for-aft (FA) mode has been tuned based on measurements obtained from a long-term ambient monitoring campaign on the same wind turbine. Using the updated model of the offshore wind tu...
Conference Proceedings of the Society for Experimental Mechanics Series, 2012
ABSTRACT The poly-reference Least Squares Complex Frequency-domain (pLSCF) estimator –commerciall... more ABSTRACT The poly-reference Least Squares Complex Frequency-domain (pLSCF) estimator –commercially known as the LMS PolyMAX method- has introduced an improvement in the field of modal analysis. The main advantages are its computational speed and the very clear stabilization diagrams it yields even in the case of highly damped systems and noisy FRF measurements. Moreover, the numerical stability of the algorithm allows for a large-bandwidth and high-model order analysis and makes it suitable both for lowly- and highly-damped structures. Regardless of the very clear stabilization diagrams, it has been observed that the damping estimates are not always reliable for highly damped modes when the FRFs are very noisy. In this paper, a two-step procedure is introduced to improve the damping estimates while maintaining the very clear stabilization diagrams. In the first step, a kind of smoothing is used to remove the noise from the data and in the second step; the pLSCF estimator is applied to the smoothed data resulting in improved (damping) estimates. In addition, the proposed procedure properly deals with uncertainty: the data variance due to measurement noise is taken into account to compute confidence bounds on the modal parameter estimates. The procedure is validated by means of simulated as well as experimental data. The presented procedure to process highly damped noisy vibration data leads to very accurate estimates in comparison to the traditional pLSCF approach.
16th IFAC Symposium on System Identification, 2012
ABSTRACT In this paper, a multivariable frequency-domain maximum likelihood estimator based on a ... more ABSTRACT In this paper, a multivariable frequency-domain maximum likelihood estimator based on a modal model formulation is proposed. The proposed approach is mainly introduced to improve the accuracy of the modal parameters estimated by the poly-reference least squares complex frequency-domain (i.e. pLSCF) estimator and to have their confidence intervals as well. In that approach, a 3-step procedure is introduced to improve the estimates accuracy while taking the advantage of the very clear stabilization diagram of pLSCF estimator. The proposed approach has been optimized to reduce the computation time as well as the memory requirements. The algorithm is evaluated and compared with two other published algorithms by means of Monte-Carlo simulations.
Proceedings of the Eleventh International Conference on Computational Structures Technology, 2012
Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award, 2001
The linear multivariable modelling of an aircraft gas turbine is presented. A frequency-domain id... more The linear multivariable modelling of an aircraft gas turbine is presented. A frequency-domain identification method is employed to estimate a family of models from engine data at a range of operating points. It is found that the fuel feed to shaft speed dynamics can be represented by second-order models. This matches the results obtained for the reduced-order linearised thermodynamic models derived from the engine physics. A direct comparison can thus be made between the estimated and thermodynamic models, which shows significant discrepancies between them for the engine tested. This work illustrates how modern system identification techniques can be used to verify engine models. The multivariable framework employed means that additional inputs and outputs can be easily incorporated into the model.
Key Engineering Materials, 2005
FREQUENCY-DOMAIN TLS AND GTLS ALGORITHMS FOR MODAL ANALYSIS APPLICATIONS Peter Verboven, Patrick ... more FREQUENCY-DOMAIN TLS AND GTLS ALGORITHMS FOR MODAL ANALYSIS APPLICATIONS Peter Verboven, Patrick Guillaume and Eli Parloo Mechanical Engineering ... 305 S. Van Huff el and P. Lemmerling (eds.), Total Least Squares and Errors-in-Variables Modeling, 305 ...
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Papers by Patrick Guillaume