Next Article in Journal
Fault-Tolerant Control of Coil Inter-Turn Short-Circuit in Five-Phase Permanent Magnet Synchronous Motor
Previous Article in Journal
Biomass to Syngas: Modified Non-Stoichiometric Thermodynamic Models for the Downdraft Biomass Gasification
Previous Article in Special Issue
High-Resolution Structure-from-Motion for Quantitative Measurement of Leading-Edge Roughness
Open AccessArticle

Dynamic Response Characterization of Floating Structures Based on Numerical Simulations

1
CONSTRUCT-ViBest, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
2
Natural Ocean Engineering Laboratory (NOEL), Mediterranea University of Reggio Calabria, 89122 Reggio Calabria, Italy
3
DICEAM Department, Mediterranea University of Reggio Calabria, 89122 Reggio Calabria, Italy
4
WavEC Offshore Renewables, 1350-352 Lisbon, Portugal
*
Author to whom correspondence should be addressed.
Energies 2020, 13(21), 5670; https://doi.org/10.3390/en13215670
Received: 24 August 2020 / Revised: 14 October 2020 / Accepted: 22 October 2020 / Published: 29 October 2020
(This article belongs to the Special Issue Dynamic Testing and Monitoring of Wind Turbines)
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. View Full-Text
Keywords: operational modal analysis; output-only identification methods; SSI-COV; automated operational modal analysis; floating structures; spar buoy; semi-submersible operational modal analysis; output-only identification methods; SSI-COV; automated operational modal analysis; floating structures; spar buoy; semi-submersible
Show Figures

Figure 1

MDPI and ACS Style

Pimenta, F.; Ruzzo, C.; Failla, G.; Arena, F.; Alves, M.; Magalhães, F. Dynamic Response Characterization of Floating Structures Based on Numerical Simulations. Energies 2020, 13, 5670.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop