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Operational Modal Analysis of a Spar-Type Floating Platform Using Frequency Domain Decomposition Method

Author

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  • Carlo Ruzzo

    (Natural Ocean Engineering Laboratory (NOEL), Mediterranea University of Reggio Calabria, Reggio Calabria 89122, Italy)

  • Giuseppe Failla

    (DICEAM Department, Mediterranea University of Reggio Calabria, Reggio Calabria 89122, Italy)

  • Maurizio Collu

    (Energy and Power Department, Cranfield University, Cranfield MK43 0AL, UK)

  • Vincenzo Nava

    (Tecnalia Research & Innovation, Energy and Environment Division, Bilbao 48160, Spain)

  • Vincenzo Fiamma

    (Natural Ocean Engineering Laboratory (NOEL), Mediterranea University of Reggio Calabria, Reggio Calabria 89122, Italy)

  • Felice Arena

    (Natural Ocean Engineering Laboratory (NOEL), Mediterranea University of Reggio Calabria, Reggio Calabria 89122, Italy)

Abstract

System identification of offshore floating platforms is usually performed by testing small-scale models in wave tanks, where controlled conditions, such as still water for free decay tests, regular and irregular wave loading can be represented. However, this approach may result in constraints on model dimensions, testing time, and costs of the experimental activity. For such reasons, intermediate-scale field modelling of offshore floating structures may become an interesting as well as cost-effective alternative in a near future. Clearly, since the open sea is not a controlled environment, traditional system identification may become challenging and less precise. In this paper, a new approach based on Frequency Domain Decomposition (FDD) method for Operational Modal Analysis is proposed and validated against numerical simulations in ANSYS AQWA v.16.0 on a simple spar-type structure. The results obtained match well with numerical predictions, showing that this new approach, opportunely coupled with more traditional wave tanks techniques, proves to be very promising to perform field-site identification of the model structures.

Suggested Citation

  • Carlo Ruzzo & Giuseppe Failla & Maurizio Collu & Vincenzo Nava & Vincenzo Fiamma & Felice Arena, 2016. "Operational Modal Analysis of a Spar-Type Floating Platform Using Frequency Domain Decomposition Method," Energies, MDPI, vol. 9(11), pages 1-15, October.
  • Handle: RePEc:gam:jeners:v:9:y:2016:i:11:p:870-:d:81370
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    References listed on IDEAS

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    1. Sethuraman, Latha & Venugopal, Vengatesan, 2013. "Hydrodynamic response of a stepped-spar floating wind turbine: Numerical modelling and tank testing," Renewable Energy, Elsevier, vol. 52(C), pages 160-174.
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    1. Veronika Valašková & Jozef Vlček & Daniel Papán, 2020. "Determination of the Small-Scale Physical Model Parameters of Pavement Structure," Sustainability, MDPI, vol. 12(22), pages 1-16, November.
    2. Kwangtae Ha & Jun-Bae Kim & Youngjae Yu & Hyoung-Seock Seo, 2021. "Structural Modeling and Failure Assessment of Spar-Type Substructure for 5 MW Floating Offshore Wind Turbine under Extreme Conditions in the East Sea," Energies, MDPI, vol. 14(20), pages 1-23, October.
    3. Choe, Do-Eun & Kim, Hyoung-Chul & Kim, Moo-Hyun, 2021. "Sequence-based modeling of deep learning with LSTM and GRU networks for structural damage detection of floating offshore wind turbine blades," Renewable Energy, Elsevier, vol. 174(C), pages 218-235.
    4. Francisco Pimenta & Carlo Ruzzo & Giuseppe Failla & Felice Arena & Marco Alves & Filipe Magalhães, 2020. "Dynamic Response Characterization of Floating Structures Based on Numerical Simulations," Energies, MDPI, vol. 13(21), pages 1-18, October.

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