Progress on the experimental set-up for the testing of a floating offshore wind turbine scaled model in a field site

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

doi:10.1177/0309524x16660023

Cited by 18 publications

(13 citation statements)

References 22 publications

(37 reference statements)

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“…A 1:128 scale model of OC3-Hywind with three catenary mooring lines has been realized and tested by Shin [14], under periodic waves and irregular waves. The authors are currently investigating a 1:30 scale model of the OC3-Hywind spar in seawater, installed at the NOEL laboratory of Reggio Calabria, Italy [15].…”

Section: Introductionmentioning

confidence: 99%

“…Within the research activities currently carried out by the authors on a 1:30 scale model of the OC3-Hywind prototype at the NOEL laboratory [15], this paper aims to assess the feasibility of a FDD approach to identify an ANSYS-AQWA [23] numerical implementation of a spar structure, under irregular waves generated by JONSWAP spectrum. Natural frequencies, mode shapes, and modal damping ratios are obtained for different parameters of JONSWAP spectrum.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…Time histories of wave-load components at (a) the surge natural frequency (f p = 0.008 Hz), (b) the heave natural frequency (f p = 0.032 Hz), and (c) the pitch natural frequency (f p = 0.037 Hz) for the OC3-Hywind spar. Figure 17a-c show the comparisons of RAOs at surge, heave and pitch natural frequencies between hydrodynamic simulator and the experimental data from a 1:30 model implemented in Natural Ocean Engineering Laboratory (NOEL) of Reggio Calabria in Italy [32,33]. The given wave condition adopted for dynamic response of MIT/NREL spar is JONSWAP spectrum (H s = 6 m, T p = 10 s, and peak-enhancement factor: γ = 3.3).…”

Section: Appl Sci 2019 9 For Peer Review 19mentioning

confidence: 99%

Investigation of Hydrodynamic Forces for Floating Offshore Wind Turbines on Spar Buoys and Tension Leg Platforms with the Mooring Systems in Waves

2019

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This study aims to develop a modularized simulation system to estimate dynamic responses of floating Offshore Wind Turbines (OWTs) based on the concepts of spar buoy and Tension Leg Platform (TLP) corresponding with two typical mooring lines. The modular system consists of the hydrodynamic simulator based the Cummins time domain equation, the Boundary Element Method (BEM) solver based on the 3D source distribution method, and an open-source visualization software ParaView to analyze the interaction between floating OWTs and waves. In order to realize the effects of mooring loads on the floating OWTs, the stiffness and damping matrices are applied to the quasi-static mooring system. The Response Amplitude Operators (RAOs) are compared between our predicted results and other published data to verify the modularized simulation system and understand the influence of mooring load on the motion responses in regular or irregular waves. It is also demonstrated that the quasi-static mooring system is applicable to different types of mooring lines as well as determining real-time motion responses. Eventually, wave load components at the resonance frequencies of different motion modes for selected floating OWTs would be present in the time domain.

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“…The support model tested is inspired to OC3-Hywind and has been represented in parked rotor conditions. The experimental activities carried out during this campaign were aimed at addressing and solving some of the problems inherent to the traditional experimental activities in ocean basins (some initial results were published in references [23][24]). In recognition of the fact that the well-known identification techniques adopted in indoor laboratories must be modified to work in a non-controlled marine environment, this paper offers a broad-wide overview about the requirements, test methodologies, instrumentations and identification methods necessary for operating dynamic identification of offshore floating structures' intermediate-scale models in open-sea conditions.…”

Section: Aimmentioning

confidence: 99%

“…C e K R 4 10 > Condition (4) is generally satisfied for full-scale offshore wind turbine spar under all the most relevant wave conditions [23], but the same may not be true for the corresponding small-scale models. Indeed, the Reynolds number scales with a factor equal to λ L 1.5 , hence condition (4) may be violated for smaller models, resulting in scale effects due to the alteration of the hydrodynamic coefficients, which describe wavestructure interaction (see, or example references [36][37]).…”

Section: Importance Of Scale Effects For Spar Structuresmentioning

confidence: 99%

On intermediate-scale open-sea experiments on floating offshore structures: Feasibility and application on a spar support for offshore wind turbines

et al. 2018

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Experimental investigation of floating structures represents the most direct way for achieving their dynamic identification and it is particularly valuable for relatively new concepts, such as floating supports for offshore wind turbines, in order to fully understand their dynamic behaviour. Traditional experimental campaigns on floating structures are carried out at small scale, in indoor laboratories, equipped with wave and wind generation facilities. This article presents the results of a 1:30 open-sea experimental activity on a scale model of the OC3-Hywind spar, in parked rotor conditions, carried out at the Natural Ocean Engineering Laboratory (NOEL) of Reggio Calabria (Italy). The aim of the experiment is twofold. Firstly, it aims to assess the feasibility of low-cost, intermediate-scale, open-sea activities on offshore structures, which are proposed to substitute or complement the traditional indoor activities in ocean basins. Secondly, it provides useful experimental data on damping properties of spar support structures for offshore wind turbines, with respect to heave, roll and pitch degrees of freedom. It has been proven that the proposed approach may overcome some limitations of traditional small-scale activities, namely high costs and small scale, and allows to enhance the fidelity of the experimental data currently available in literature for spar floating supports for offshore wind turbines. Keywords 1. Offshore structures 2. Spar 3. Floating wind turbines 4. Physical model 5. Heave damping 6. Roll damping development of reliable dynamic models, able to represent the coupled behaviour of the floating wind turbines [2-3]. While such models are usually implemented by means of numerical codes [4-5], experimental activities play a crucial role for their validation, as well as for the system identification. The experimental activities on floating offshore wind turbines may be classified in two groups, namely small-scale and large-scale ones. Traditional small-scale activities (1:50-1:100) are carried out in controlled environment such as wave tanks and ocean basins, where the desired wind-wave conditions can be reproduced, to measure the dynamic response of the structure and to calibrate opportunely the numerical codes [6-8]. Although the controlled environment allows to achieve very precise and reliable results, these activities have some relevant disadvantages, namely high rental fees of the basins, limited duration of the experiments, and limitations in representing all the relevant physical phenomena at scale level, which may alter significantly the dynamic behaviour of the model with respect to the full-scale structure. On the opposite side, large-scale activities (1:1-1:10) are carried out in open-sea and allow to represent all the relevant features of the offshore wind turbines, including turbine-support interaction, mooring system and grid connection, in relevant operational conditions [9-11]. Clearly, such projects are very expensive and usually represent pilot activities, which are carried out...

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Progress on the experimental set-up for the testing of a floating offshore wind turbine scaled model in a field site

Cited by 18 publications

References 22 publications

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

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

Investigation of Hydrodynamic Forces for Floating Offshore Wind Turbines on Spar Buoys and Tension Leg Platforms with the Mooring Systems in Waves

On intermediate-scale open-sea experiments on floating offshore structures: Feasibility and application on a spar support for offshore wind turbines

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