Fatigue Analysis of Offshore Wind Turbines on Fixed Support Structures

Alati, Natale; Nava, Vincenzo; Failla, Giuseppe; Arena, Felice; Santini, Adolfo

doi:10.4028/www.scientific.net/kem.569-570.539

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…The process of finding an integral is called integration. In basic reliability engineering, the meaning of reliability is the performance at or above a given standard (rated from 0 to 1, where 0 is the least reliable) (Abu Husain et al, 2013;Alati et al, 2013;Mat Soom, 2018;Mohd Zaki et al, 2016;Mourão et al, 2020;Rathod et al, 2011). On the other hand, the probability of failure is the performance below a given standard (rated from 0 to 1, where 1 is an absolute failure).…”

Section: Integral and Interference Theorymentioning

confidence: 99%

Probability of Failure for Fixed Offshore Structures Determination: An Analysis of a Braced Monopod and 4-Legged Platforms with Respect to Industry Standards

Mat Soom,

Mohamad,

Abu Husain

et al. 2024

JSCET

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The structural integrity is susceptible to a combination of statistical and engineering design uncertainties that may remain flexible as long as the structure can successfully manage the encountered load. There are many methods for determining the probability of failure (POF) in the oil and gas sector, but they all have particular constraints. Therefore, this study is a quantitative risk assessment to establish a more reliable method for calculating the POF value. This study chose and evaluated a sample of a braced monopod and 4 legged offshore structures for global non-linear analysis. The most reliable form of distribution was predetermined, and the appropriate integral equation was applied and computed based on the load and strength model conditions. The result of the testing of stress-strength interference for 12 directions and for 8 directions of wave impact in POF indicated that the platform remained intact and reliable compared to the L2 exposure level for the reliability target of POF recommended by ISO 19902, ISO 19901, and PETRONAS. Furthermore, this established that the applied integral equation provided a high degree of confidence in calculating the new POF. This newly created approach will enable the structural engineer to outline action items as part of the organisation’s risk management process.

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Section: Integral and Interference Theorymentioning

confidence: 99%

Probability of Failure for Fixed Offshore Structures Determination: An Analysis of a Braced Monopod and 4-Legged Platforms with Respect to Industry Standards

Mat Soom,

Mohamad,

Abu Husain

et al. 2024

JSCET

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“…The fragility of the support structure was investigated under different operating conditions. Alati et al [22] compared the dynamic responses of two types of fixed-bottom OWTs subjected to wind and earthquake loadings using Bladed. The SSI effect was examined using the linear coupled-springs model.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of coupled wind-wave-earthquake responses of a 10 MW fixed-bottom offshore wind turbine

Yang

Bashir

et al. 2020

Renewable Energy

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“…The justification of the above simplified method in fatigue analysis is attributable to the following: (a) material and geometric nonlinearities are not significant structural fatigue responses, (b) wind and wind-induced currents and waves can be assumed as stationary and independent processes, and (c) soil stress levels are moderate to presume linear behavior under wind and sea wave loading [14]. Employing such approach allows for the advantageous implementation of simple soil-structure interaction behavior.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Optimization of Support Structures for Offshore Wind Turbines Using Genetic Algorithm with Domain‐Trimming

AlHamaydeh

Barakat

Nasif

2017

Mathematical Problems in Engineering

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The powerful genetic algorithm optimization technique is augmented with an innovative "domain-trimming" modification. The resulting adaptive, high-performance technique is called Genetic Algorithm with Domain-Trimming (GADT). As a proof of concept, the GADT is applied to a widely used benchmark problem. The 10-dimensional truss optimization benchmark problem has well documented global and local minima. The GADT is shown to outperform several published solutions. Subsequently, the GADT is deployed onto three-dimensional structural design optimization for offshore wind turbine supporting structures. The design problem involves complex least-weight topology as well as member size optimizations. The GADT is applied to two popular design alternatives: tripod and quadropod jackets. The two versions of the optimization problem are nonlinearly constrained where the objective function is the material weight of the supporting truss. The considered design variables are the truss members end node coordinates, as well as the cross-sectional areas of the truss members, whereas the constraints are the maximum stresses in members and the maximum displacements of the nodes. These constraints are managed via dynamically modified, nonstationary penalty functions. The structures are subject to gravity, wind, wave, and earthquake loading conditions. The results show that the GADT method is superior in finding best discovered optimal solutions.

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Fatigue Analysis of Offshore Wind Turbines on Fixed Support Structures

Cited by 5 publications

References 11 publications

Probability of Failure for Fixed Offshore Structures Determination: An Analysis of a Braced Monopod and 4-Legged Platforms with Respect to Industry Standards

Probability of Failure for Fixed Offshore Structures Determination: An Analysis of a Braced Monopod and 4-Legged Platforms with Respect to Industry Standards

Mitigation of coupled wind-wave-earthquake responses of a 10 MW fixed-bottom offshore wind turbine

Optimization of Support Structures for Offshore Wind Turbines Using Genetic Algorithm with Domain‐Trimming

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