Application of a lumping method for fatigue design of monopile-based wind turbines using fully coupled and simplified models

Katsikogiannis, George; Hegseth, John Marius; Bachynski‐Polić, Erin E.

doi:10.1016/j.apor.2021.102998

Cited by 9 publications

(5 citation statements)

References 28 publications

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“…Both overestimations that come from unidirectional wind and waves as well as the underestimation that comes from omitting wave-wind-current interactions 385 (Kvittem and Moan, 2015;Kvittem et al, 2011) In addition, considerable effort has been given to decreasing the computational effort required for fully coupled time-domain simulations to estimate total fatigue damage. Katsikogiannis et al (2021) developed a lumping process to design load cases through damage-equivalent contour lines, showing a significant improvement in the computational effort by 93%, with a 6% deviation from the complete scatter analysis, which was estimated to be between 40-80% for the frequency-domain approach 390 in Katsikogiannis et al (2022).…”

Section: Time-domain Approachmentioning

confidence: 99%

A critical review of challenges and opportunities for effective design and operation of offshore structures supporting green hydrogen production, storage, and transport

Rodriguez,

Yeter,

et al. 2023

Preprint

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Abstract. The climate emergency has prompted rapid and intensive research into sustainable, reliable, and affordable energy alternatives. Offshore wind has developed and exceeded all expectations over the last two decades and is now a central pillar of the UK and other international strategies to decarbonise energy systems. As the dependence on variable renewable energy resources increases, so does the importance of the necessity to develop energy storage and non-electric energy vectors to ensure a resilient whole-energy system, also enabling difficult to decarbonise applications, e.g., heavy industrial, heat and certain areas of transport. Offshore wind and marine renewables have enormous potential that can never be completely utilised by the electricity system, and so green hydrogen has become a topic of increasing interest. Although numerous offshore and marine technologies are possible, the most appropriate combinations of power generation, materials and supporting structures, electrolysers and support infrastructure and equipment depend on a wide range of factors, including the potential to maximise the use of local resources. This paper presents a critical review of contemporary offshore engineering tools and methodologies developed over many years for the upstream oil & gas, maritime and more recently offshore wind and renewable energy applications and examines how these along with recent developments in modelling and digitalisation might provide a platform to optimise green hydrogen offshore infrastructure. The key-drivers and characteristics of future offshore green hydrogen systems are considered, and a Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis provided to aid the discussion of the challenges and opportunities for the offshore green hydrogen production sector.

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Section: Time-domain Approachmentioning

confidence: 99%

A critical review of challenges and opportunities for effective design and operation of offshore structures supporting green hydrogen production, storage, and transport

Rodriguez,

Yeter,

et al. 2023

Preprint

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“…The second spectral moment of the RSS can be determined from the second spectral moments of the OSSs by analogy with Equation (12), and it can be given as (13) where m 2rj represents the second spectral moment of the RSS related to the jth block, and m 2kj represents the second spectral moment of the kth OSS in the jth block.…”

Section: Spectral Moment Equivalence (Sme)-based Lbemmentioning

confidence: 99%

“…The time-domain fatigue assessment method can consider the nonlinearities of the system and the hydrodynamic loads accurately via a coupled dynamic analysis model, and the dynamic response can be converted into a series of response ranges and cycle numbers with the aid of the rain-flow counting algorithm [11]. As a result, it can be used as the benchmark for other methods [12,13]. However, the time-domain method has a remarkable computational cost.…”

Section: Introductionmentioning

confidence: 99%

A Novel Wave Energy Equivalence Based Lumping Block Method for Efficiently Predicting the Fatigue Damage of Mooring Lines

Guo,

Wang,

Guo

et al. 2023

JMSE

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The lumping block equivalent method (LBEM) is widely used to reduce the computational effort in the fatigue damage assessment of offshore structures, and the wave parameters of the representative sea states (RSSs) resulting from LBEM are of vital importance for the accurate prediction of offshore structures’ fatigue damage. In this study, a novel wave energy equivalence (WEE)-based LBEM is proposed to determine the wave parameters of the RSS accurately. The novelty of the proposed method is that a compact relationship between the input wave energy component and mooring lines’ fatigue damage is derived, and the modified statistical relationships between the wave parameters and spectral moments are provided by incorporating the effects of the peak enhancement factor of the input wave spectrum, the number of original sea states (OSSs) and the equivalence bandwidth of the OSSs. Based on the compact relationship, the wave energy component of the RSS can be determined from the wave energy component of the OSSs for each wave frequency from the viewpoint of the fatigue damage equivalence criterion. The wave energy distribution of the RSS can be accurately characterized with the wave energy distribution of the OSSs, and the spectral moments of the RSS can be calculated by its energy distribution directly, without any approximation. Moreover, the wave parameters of the RSS can be determined from the modified statistical relationships easily. The effectiveness of the proposed WEE LBEM is numerically investigated with a moored semi-submersible platform. Results show that the proposed WEE LBEM is robust, efficient and accurate within engineering expectations, and it outperforms the conventional LBEMs both in accuracy and robustness.

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“…This consolidates the need to consider the effect of wind velocity on the stresses generated in the OWT support structure. Previous research works have mainly focussed on researching the soil-pile interaction of wind turbine support structures, [7][8][9][10][11][12][13][14] fatigue assessments, design and performance, 3,[14][15][16][17][18][19][20] induced stresses in welds and connections and their performance [21][22][23][24][25] and recently, corrosion 26,27 while applying finite element analysis. 28,29 Although key findings involved optimised design parameters, stress concentrations and corrosion mechanisms, missing gaps include integrating these factors, mainly how corrosion and stresses interact in the support structure.…”

Section: Introductionmentioning

confidence: 99%

Stress analyses of high-rated capacity large diameter offshore wind turbines: Analytical and numerical analyses of uniform corrosion effects

Okenyi,

Bodaghi,

Siegkas

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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As the wind energy sector grows, offshore wind turbines (OWTs) have been pushed to have higher power outputs. This has led to large-diameter OWT support structures that are capable of withstanding aerodynamic and hydrodynamic loads as well as corrosion. This research analyses a 15-megawatt (MW) OWT support structure using analytical and numerical models. The analytical model was applied based on the Euler-Bernoulli beam theory. Static and modal finite element models were also applied. The structural stability implications of uniform corrosion on the stress evolution of the monopile and tower at different corrosion zones were discussed. Analytical and numerical (finite element analysis) predictions of stress evolution for different wind velocities and uniform corrosion material loss showed an agreement. The analyses showed that material loss due to corrosion increased the stress levels in the support structure. The location of the maximum tensile stress changed from the submerged to the splash zone, indicating that the splash zone may accumulate more damage over time due to the reduction of the monopile thickness and generation of local pits. Predicting the stress evolution due to uniform corrosion could be instrumental in the future designs of OWTs. It can be integral to fatigue assessments for enabling more detailed and accurate life predictions.

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Application of a lumping method for fatigue design of monopile-based wind turbines using fully coupled and simplified models

Cited by 9 publications

References 28 publications

A critical review of challenges and opportunities for effective design and operation of offshore structures supporting green hydrogen production, storage, and transport

A critical review of challenges and opportunities for effective design and operation of offshore structures supporting green hydrogen production, storage, and transport

A Novel Wave Energy Equivalence Based Lumping Block Method for Efficiently Predicting the Fatigue Damage of Mooring Lines

Stress analyses of high-rated capacity large diameter offshore wind turbines: Analytical and numerical analyses of uniform corrosion effects

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