Site-specific variability of load extremes of offshore wind turbines exposed to hurricane risk and breaking waves

Hallowell, Spencer T.; Myers, Andrew C.

doi:10.1002/we.1996

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…Researchers have presented detailed information on the nonlinear analysis of offshore structures coupled with wave analysis. The work explored the post-elastic evaluation of the structural characteristics under offshore conditions as well as the effect of the breaking waves on such projects [163][164][165][166]. Unfavorable conditions, such as hurricanes, which usually lead to an increase in wind velocity and wave height, have also been investigated [167].…”

Section: Towers and Foundationmentioning

confidence: 99%

Selection Guidelines for Wind Energy Technologies

et al. 2021

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The building block of all economies across the world is subject to the medium in which energy is harnessed. Renewable energy is currently one of the recommended substitutes for fossil fuels due to its environmentally friendly nature. Wind energy, which is considered as one of the promising renewable energy forms, has gained lots of attention in the last few decades due to its sustainability as well as viability. This review presents a detailed investigation into this technology as well as factors impeding its commercialization. General selection guidelines for the available wind turbine technologies are presented. Prospects of various components associated with wind energy conversion systems are thoroughly discussed with their limitations equally captured in this report. The need for further optimization techniques in terms of design and materials used for the development of each component is highlighted.

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Section: Towers and Foundationmentioning

confidence: 99%

Selection Guidelines for Wind Energy Technologies

et al. 2021

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“… ( Shittu et al, 2020 ; Kolios and Wang, 2018 ; Morató et al, 2019 ) Crack growth Multi-failure system reliability analysis using FORM and SORM. ( Yeter et al, 2016 ) Anchors Ultimate Strength System reliability using MCS ( Hallowell et al, 2018 ) Blade Excessive displacement of blade tip Overload of blade root Fatigue Uncorrelated limit-state exceedance probability calculation ( Liu et al, 2019b ; Zhang, 2018 ) Gears Fatigue Corrosion Reliability analysis using FORM and MCS ( Dong et al, 2020 ; Scheu et al, 2017 ) Mooring line Fatigue Ultimate strength Reliability analysis using MCS and FORM/ Second Order Reliability Method (SORM) ( Wandji et al, 2016 ; Hallowell and Myers, 2017 ; Kang et al, 2016a ) …”

Section: Reliability Analysis Of the Integrated Systemmentioning

confidence: 99%

Reliability of multi-purpose offshore-facilities: Present status and future direction in Australia

Aryai

Abdussamie

Salehi

et al. 2021

Process Safety and Environmental Protection

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Sustainable use of the ocean for food and energy production is an emerging area of research in different countries around the world. This goal is pursued by the Australian aquaculture, offshore engineering and renewable energy industries, research organisations and the government through the “Blue Economy Cooperative Research Centre”. To address the challenges of offshore food and energy production, leveraging the benefits of co-location, vertical integration, infrastructure and shared services, will be enabled through the development of novel Multi-Purpose Offshore-Platforms (MPOP). The structural integrity of the designed systems when being deployed in the harsh offshore environment is one of the main challenges in developing the MPOPs. Employing structural reliability analysis methods for assessing the structural safety of the novel aquaculture-MPOPs comes with different limitations. This review aims at shedding light on these limitations and discusses the current status and future directions for structural reliability analysis of a novel aquaculture-MPOP considering Australia’s unique environment. To achieve this aim, challenges which exist at different stages of reliability assessment, from data collection and uncertainty quantification to load and structural modelling and reliability analysis implementation, are discussed. Furthermore, several solutions to these challenges are proposed based on the existing knowledge in other sectors, and particularly from the offshore oil and gas industry. Based on the identified gaps in the review process, potential areas for future research are introduced to enable a safer and more reliable operation of the MPOPs.

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“…The wave theory used in the software is linear, which under predicts the peak wave loads of large storm waves. This simplification can be overcome by inserting non-linear waves replacing large waves, poorly assessed by the linear wave theory, for instance, by using the approach proposed by Hallowell at al [42]. Given the illustrative nature of the application presented here, it is decided to just rely on linear wave kinematics as implemented in FAST.…”

Section: Structural Analysismentioning

confidence: 99%

A probabilistic framework for offshore wind turbine loss assessment

Wilkie

Galasso

2020

Renewable Energy

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During their operational life, offshore wind turbines (OWTs) may be exposed to severe storms, resulting in extreme wind and wave loading acting on the OWT structure (and substructure). This paper proposes quantifying financial losses associated with an OWT exposed to extreme wind and waves using a probabilistic risk modelling framework, as a first step towards evaluating offshore wind farm (OWF) resilience. The proposed modelling framework includes a number of novel elements: 1) the development of site-specific fragility relationships (i.e., likelihood of different levels of damage experienced by an OWT over a range of hazard intensities), properly accounting for uncertainties in both structural capacity and demands; 2) the implementation of a closed-form technique, based on a combinatorial system reliability approach, to assess failure consequences (e.g., financial loss) for both structural and nonstructural components; 3) a coherent treatment of epistemic uncertainties across the framework (e.g., sampling variability in fragility estimation), providing loss results accounting for uncertainty of estimation. These aspects can allow for more informative comparisons of various design solutions in terms of structural fragility and risk and/or an improved evaluation of probabilistic losses for decision making. An illustrative application to two case-study sites is presented as a simplified walk-through of the calculation steps in the proposed framework, discussing possible outcomes. For instance, the results from the illustrative application indicate the structural components play an important role in the overall risk profile of an OWT, but this depends on the site-specific wind and wave conditions. The calculation of losses provides a foundation from which a more detailed assessment of OWT and OWF resilience could be developed.

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Site-specific variability of load extremes of offshore wind turbines exposed to hurricane risk and breaking waves

Cited by 11 publications

References 24 publications

Selection Guidelines for Wind Energy Technologies

Selection Guidelines for Wind Energy Technologies

Reliability of multi-purpose offshore-facilities: Present status and future direction in Australia

A probabilistic framework for offshore wind turbine loss assessment

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