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

Carlo Ruzzo, Giuseppe Failla, Maurizio Collu, Vincenzo Nava, Vincenzo Fiamma and Felice Arena
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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

Energies, 2016, vol. 9, issue 11, 1-15

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.

Keywords: Frequency Domain Decomposition; output-only system identification; damping of offshore structures (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: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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