Browsing by Keyword "Floating offshore wind"
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Item Diagnosis of the health status of mooring systems for floating offshore wind turbines using autoencoders(2023-11-01) Gorostidi, N.; Pardo, D.; Nava, V.; RENOVABLES OFFSHOREFloating offshore wind turbines (FOWTs) show promise in terms of energy production, availability, and sustainability, but remain unprofitable due to high maintenance costs. This work proposes a deep learning algorithm to detect mooring line degradation and failure by monitoring the dynamic response of the publicly available DeepCWind OC4 semi-submersible platform. This study implements an autoencoder capable of predicting multiple forms of damage occurring at once, with various levels of severity. Given the scarcity of real data, simulations performed in OpenFAST, recreating both healthy and damaged mooring systems, are used to train and validate the algorithm. The novelty of the proposed approach consists of using a set of key statistical metrics describing the platform's displacements and rotations as input layer for the autoencoder. The statistics of the responses are calculated at 33-minute-long sea states under a broad spectrum of metocean and wind conditions. An autoencoder is trained using these parameters to discover that the proposed algorithm is capable of detecting mild anomalies caused by biofouling and anchor displacements, with correlation coefficients up to 98.51% and 99.16%, respectively. These results are encouraging for the continuous health monitoring of FOWT mooring systems using easily measurable quantities to plan preventive maintenance actions adequately.Item Efficient hydrodynamic analysis for preliminary design of Floating Offshore Wind substructures(2023-10-01) Alonso Reig, Maria; Mendikoa, Iñigo; Touzon, Imanol; Petuya, Victor; RENOVABLES OFFSHORE; Tecnalia Research & InnovationThe cost of Floating Offshore Wind (FOW) is driven by the foundation, thus it can be reduced by optimising the floater design from the early stage. Most of the numerical tools for the platform design integrate radiation–diffraction theory-based software, but it can make the whole process very time-consuming since the preliminary design phases usually imply the analysis of a large number of designs. In order to accelerate the first stages of design, and consequently, achieve the foundation cost reduction, this study proposes an efficient methodology for the hydrodynamic added mass, radiation damping, and excitation loads calculation. The method is implemented for a semi-submersible platform, and it is verified against the radiation–diffraction commercial software AQWA. The methodology is validated through a comparative analysis of the response of ten different platforms, and it has shown that the hydrodynamic coefficients derived from either radiation–diffraction analysis or from the proposed method lead to equivalent conclusions. The maximum values of the platform's pitch angle and the nacelle acceleration are assessed, achieving a maximum deviation among the most critical designs of 3% and 17%, respectively. This methodology has demonstrated to provide with reasonable accuracy the dynamic behaviour of the offshore wind substructures achieving a significant computational cost reduction compared to the state-of-the-art methods, which enables to accelerate the optimisation process and thus, resulting in a more accurate floater preliminary design.Item Fast Frequency-Domain Based Tool for FOWT Platforms Preliminary Design(Springer Science and Business Media B.V., 2023) Alonso-Reig, María; Mendikoa, Iñigo; Petuya, Victor; Petuya, Victor; Quaglia, Giuseppe; Parikyan, Tigran; Carbone, Giuseppe; RENOVABLES OFFSHOREAn efficient frequency-domain numerical tool for the preliminary design of the floating offshore wind substructures is developed and validated against a time-domain state-of-the-art method. The tool is based on an existing simplified frequency-domain response model that has been improved through the coupling of two developed modules that perform an efficient hydrodynamic analysis compared to the radiation-diffraction analysis. The first module estimates the linear hydrodynamic coefficients by means of interpolation functions and the second module calculates the second-order hydrodynamic loads based on the Morison and Rainey force models. Both modules have been validated with radiation-diffraction analysis. The proposed tool enables a fast comparative analysis between many floater designs for a given wind turbine and identifies 1000 times faster than the state-of-the-art methods those that meet the predefined requirements.