Offshore wind turbine fatigue loads: The influence of alternative wave modeling for different turbulent and mean winds

Marino, Enzo; Giusti, Alessandro; Manuel, Lance

doi:10.1016/j.renene.2016.10.023

Cited by 65 publications

(29 citation statements)

References 38 publications

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“…A research on fatigue loads was processed based on the nonlinear wave models with consideration for different mean wind speeds and turbulence intensities. The results indicate that the hydrodynamic and aerodynamic loads mainly acting on OWTs may play a different degree of the role in the structural fatigue analysis under standstill and operational conditions [160].…”

Section: Fatigue Life Assessmentmentioning

confidence: 98%

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

et al. 2019

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With the depletion of fossil energy, offshore wind power has become an irreplaceable energy source for most countries in the world. In recent years, offshore wind power generation has presented the gradual development trend of larger capacity, taller towers, and longer blades. The more flexible towers and blades have led to the structural operational safety of the offshore wind turbine (OWT) receiving increasing worldwide attention. From this perspective, health monitoring systems and operational safety evaluation techniques of the offshore wind turbine structure, including the monitoring system category, data acquisition and transmission, feature information extraction and identification, safety evaluation and reliability analysis, and the intelligent operation and maintenance, were systematically investigated and summarized in this paper. Furthermore, a review of the current status, advantages, disadvantages, and the future development trend of existing systems and techniques was also carried out. Particularly, the offshore wind power industry will continue to develop into deep ocean areas in the next 30 years in China. Practical and reliable health monitoring systems and safety evaluation techniques are increasingly critical for offshore wind farms. Simultaneously, they have great significance for strengthening operation management, making efficient decisions, and reducing failure risks, and are also the key link in ensuring safe energy compositions and achieving energy development targets in China. The aims of this article are to inform more scholars and experts about the status of the health monitoring and safety evaluation of the offshore wind turbine structure, and to contribute toward improving the efficiency of the corresponding systems and techniques.

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Section: Fatigue Life Assessmentmentioning

confidence: 98%

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

et al. 2019

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“…As highlighted previously, in recent years, research on wind turbine SN fatigue loading has addressed detailed aspects that introduce uncertainty in the SN fatigue assessment, and less focus has been given to the probability theory assumptions related to the loading spectra characterization, such as effect of the turbulence length scales on the loading spectra, atmospheric stability, hydrodynamic theories, or the (design effort) cost of the design procedure …”

Section: Owt Sn Fatigue Designmentioning

confidence: 99%

“…Results of the extrapolated values of damage for the different simulation cases presented 14. 1.16 1.22 1.13 1.18 1.18 1.17 1.23 1.11 1.19 1.18 1.18 1.11 1.11 1.04 1.08 1.13 1.13 0.98 1.04 .75 2.62 3.11 2.27 3.55 3.31 2.88 3.54 3.58 2.92 2.66 IV 1.01 1.08 1.25 1.31 2.02 1.56 1.13 1.23 1.18 1.25 1.11 1.2 1.13 1.22 1.13 1.18 1.06 1.15 1.19 1.22 0.97 1.06 V 1.02 1.11 1.28 1.36 1.41 1.29 1.26 1.31 1.19 1.32 1.14 1.25 1.23 1.29 1.15 1.19 1.07 1.18 1.2 Note.…”

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confidence: 99%

Analysis of long‐term loading characterization for stress‐cycle fatigue design

2019

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The present paper discusses the application of stress‐cycle (SN) fatigue design procedures for offshore wind turbines, applied to the tower and substructure, and emphasizing the long‐term loading characterization. Three main methodologies are compared to assess SN fatigue long‐term design, direct scale‐up of loads and cycles to the design lifetime, probability fit for the loading distribution, and truncation and fit of the tail region. Different characteristic SN slopes are researched. The comprehensive comparison developed shows that limited interest exists in increasing the complexity of the loading assessment for SN fatigue design. In particular, the notion of representative sample has key influence on the fatigue calculations. Probability analysis techniques are not an adequate substitute of a representative sample. If definition of a representative sample for design is unpractical due to its large cost, direct scale‐up of cycles from a time t to a larger time T can be applied with uncertainty assessment. Bootstrapping of load ranges is implemented to tackle the limitations imposed by approaching a design time much larger than the evaluated time. It takes advantage of the fact that SN fatigue design is a statistical problem of mean value. Bootstrapping proved to be an efficient estimator of uncertainty with relatively constant confidence bounds, of particular interest to perform SN fatigue design with small samples. New insights on its application for fatigue design are presented. Due to its simple application and nonparametric character, it can be applied in combination with other techniques, such as extrapolation of loads and cycles.

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“…In addition, the approach to analyze the evolution of stochastic properties associated to the operation of wind turbines has been made, particularly in what concerns loads on the wind turbine (see Lind et al [14,15]). Regarding the aeroelastic behavior, such as the case when the turbine is in power production the dynamic response, the behavior of wind turbine is completely different due to a significant increase of aerodynamic damping (see Marino et al [16,17]). Regarding the improvements of Morison equation for steep waves and for diffraction regimes, there have been some reference works (see Nielsen et al [18]; Paulsen et al [19]; Bredmose et al [20]; Patel and Witz [21]).…”

Section: Introductionmentioning

confidence: 99%

Study of Floating Wind Turbine with Modified Tension Leg Platform Placed in Regular Waves

Song

Lim

2019

Energies

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In this study, the typical ocean environment was simulated with the aim to investigate the dynamic response under various environmental conditions of a Tension Leg Platform (TLP) type floating offshore wind turbine system. By applying Froude scaling, a scale model with a scale of 1:200 was designed and model experiments were carried out in a lab-scale wave flume that generated regular periodic waves by means of a piston-type wave generator while a wave absorber dissipated wave energy on the other side of the channel. The model was designed and manufactured based on the standard prototype of the National Renewable Energy Laboratory (NREL) 5 MW offshore wind turbine. In the first half of the study, the motion and structural responses for operational wave conditions of the North Sea near Scotland were considered to investigate the performance of a traditional TLP floating wind turbine compared with that of a newly designed TLP with added mooring lines. The new mooring lines were attached with the objective of increasing the horizontal stiffness of the system and thereby reducing the dominant motion of the TLP platform (i.e., the surge motion). The results of surge translational motions were obtained both in the frequency domain, using the response amplitude operator (RAO), and in the time domain, using the omega arithmetic method for the relative velocity. The results obtained show that our suggested concept improves the stability of the platform and reduces the overall motion of the system in all degrees-of-freedom. Moreover, the modified design was verified to enable operation in extreme wave conditions based on real data for a 100-year return period of the Northern Sea of California. The loads applied by the waves on the structure were also measured experimentally using modified Morison equation—the formula most frequently used to estimate wave-induced forces on offshore floating structures. The corresponding results obtained show that the wave loads applied on the new design TLP had less amplitude than the initial model and confirmed the significant contribution of the mooring lines in improving the performance of the system.

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Offshore wind turbine fatigue loads: The influence of alternative wave modeling for different turbulent and mean winds

Cited by 65 publications

References 38 publications

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

Health Monitoring and Safety Evaluation of the Offshore Wind Turbine Structure: A Review and Discussion of Future Development

Analysis of long‐term loading characterization for stress‐cycle fatigue design

Study of Floating Wind Turbine with Modified Tension Leg Platform Placed in Regular Waves

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