Dynamic Response Characterization of Floating Structures Based on Numerical Simulations

Francisco Pimenta, Carlo Ruzzo, Giuseppe Failla, Felice Arena, Marco Alves and Filipe Magalhães
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Francisco Pimenta: CONSTRUCT-ViBest, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Carlo Ruzzo: Natural Ocean Engineering Laboratory (NOEL), Mediterranea University of Reggio Calabria, 89122 Reggio Calabria, Italy
Giuseppe Failla: DICEAM Department, Mediterranea University of Reggio Calabria, 89122 Reggio Calabria, Italy
Felice Arena: Natural Ocean Engineering Laboratory (NOEL), Mediterranea University of Reggio Calabria, 89122 Reggio Calabria, Italy
Marco Alves: WavEC Offshore Renewables, 1350-352 Lisbon, Portugal
Filipe Magalhães: CONSTRUCT-ViBest, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal

Energies, 2020, vol. 13, issue 21, 1-18

Abstract: Output-only methods are widely used to characterize the dynamic behavior of very diverse structures. However, their application to floating structures may be limited due to their strong nonlinear behavior. Therefore, since there is very little experience on the application of these experimental tools to these very peculiar structures, it is very important to develop studies, either based on numerical simulations or on real experimental data, to better understand their potential and limitations. In an initial phase, the use of numerical simulations permits a better control of all the involved variables. In this work, the Covariance-driven Stochastic Subspace Identification (SSI-COV) algorithm is applied to numerically simulated data of two different solutions to Floating Offshore Wind Turbines (FOWT) and for its capability of tracking the rigid body motion modal properties and susceptibility to different modeling restrictions and environmental conditions tested. The feasibility of applying the methods in an automated fashion in the processing of a large number of datasets is also evaluated. While the structure natural frequencies were consistently obtained from all the simulations, some difficulties were observed in the estimation of the mode shape components in the most changeling scenarios. The estimated modal damping coefficients were in good agreement with the expected results. From all the results, it can be concluded that output-only methods are capable of characterizing the dynamic behavior of a floating structure, even in the context of continuous dynamic monitoring using automated tracking of the modal properties, and should now be tested under uncontrolled environmental loads.

Keywords: operational modal analysis; output-only identification methods; SSI-COV; automated operational modal analysis; floating structures; spar buoy; semi-submersible (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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