Long-term fatigue analysis of multi-planar tubular joints for jacket-type offshore wind turbine in time domain

Dong, Wenbin; Moan, Torgeir; Gao, Zhen

doi:10.1016/j.engstruct.2011.02.037

Cited by 123 publications

(58 citation statements)

References 5 publications

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“…All these results are in agreement with findings of similar studies [24,27]. For design purposes, it is important to remark that the frequencies of the first FA 43.…”

Section: Introductionsupporting

confidence: 82%

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Alati

Failla

Arena

2015

Phil. Trans. R. Soc. A.

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This study investigates the seismic response of a horizontal axis wind turbine on two bottom-fixed support structures for transitional water depths (30-60 m), a tripod and a jacket, both resting on pile foundations. Fully coupled, nonlinear time-domain simulations on full system models are carried out under combined wind-wave-earthquake loadings, for different load cases, considering fixed and flexible foundation models. It is shown that earthquake loading may cause a significant increase of stress resultant demands, even for moderate peak ground accelerations, and that fully coupled nonlinear time-domain simulations on full system models are essential to capture relevant information on the moment demand in the rotor blades, which cannot be predicted by analyses on simplified models allowed by existing standards. A comparison with some typical design load cases substantiates the need for an accurate seismic assessment in sites at risk from earthquakes.

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“…All these results are in agreement with findings of similar studies [24,27]. For design purposes, it is important to remark that the frequencies of the first FA 43.…”

Section: Introductionsupporting

confidence: 82%

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Alati

Failla

Arena

2015

Phil. Trans. R. Soc. A.

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“…Decoupled or coupled analyses were conducted to study the wind turbine behavior and structural dynamics of the jacket-support structures. [13][14][15][16][17][18] However, in these previous studies, the jacket substructures are assumed to be rigidly clamped to the seabed. The analytical method for soil-pile interaction and group effect is well developed and commonly used in the offshore oil and gas industry.…”

Section: Introductionmentioning

confidence: 99%

Soil-structure interaction on the response of jacket-type offshore wind turbine

Park

Chung

Shin

et al. 2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Jacket structures are still at the early stage of their development for use in the offshore wind industry. The aim of this paper is to investigate the effect of the soil-structure interaction on the response of an offshore wind turbine with a jacket-type foundation. For this purpose, two different models of flexible foundation-the p-y model and the p-y model considering pile groups effect-are employed to compare the dynamic responses with the fixed-base model. The modal analysis and the coupled dynamic analysis are carried out under deterministic and stochastic conditions. The influence of the soil-structure interaction on the response of the jacket foundation predicts that the flexible foundation model is necessary to estimate the loads of the offshore wind turbine structure well. It is suggested that during fatigue analysis the pile group effect should be considered for the jacket foundation.

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“…The uncertainty in distribution fitting should be reduced by having more simulation results. If 2-parameter Weibull distribution does not fit the load range, other 8 distributions such as generalized gamma function can also lead to an analytical fatigue damage formulation [36].…”

Section: -2-2 Effect On Bearing Fatigue Damagementioning

confidence: 99%

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

et al. 2014

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This paper addresses the effect of gear geometrical errors in wind turbine planetary gearboxes with a floating sun gear. Numerical simulations and experiments are employed throughout the study. A National Renewable Energy Laboratory 750-kW gearbox is modelled in a multibody environment and verified using the experimental data obtained from a dynamometer test. The gear geometrical errors, which are both assembly-dependent and assembly-independent, are described, and planet-pin misalignment and eccentricity are selected as the two most influential and key errors for case studies. Various load cases involving errors in the floating and nonfloating sun gear designs are simulated, and the planet-bearing reactions, gear vibrations, gear mesh loads and bearing fatigue lives are compared. All tests and simulations are performed at the rated wind speed.

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Long-term fatigue analysis of multi-planar tubular joints for jacket-type offshore wind turbine in time domain

Cited by 123 publications

References 5 publications

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Seismic analysis of offshore wind turbines on bottom-fixed support structures

Soil-structure interaction on the response of jacket-type offshore wind turbine

Effects of floating sun gear in a wind turbine's planetary gearbox with geometrical imperfections

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