Current, wave, wind and interaction induced dynamic response of a 5 MW spar-type offshore direct-drive wind turbine

Ye, Kan; Ji, Jinchen

doi:10.1016/j.engstruct.2018.10.023

Cited by 38 publications

(10 citation statements)

References 27 publications

(43 reference statements)

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“…In the recent decade, the fatigue behavior of construction materials received great attention because natural or human activity-induced loads on buildings are often cyclic in essence [ 11 ]. When concrete is subjected to cyclic loading, there will be residual strain accumulating after each cycle, which indicates the internal progressive permanent structural change in concrete [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Performance of Repaired Concrete under Cyclic Flexural Loading

Wang

Gupta

2021

Materials

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There is limited research reported on the effect of cyclic loading on cement-based repair materials as conducting such tests is time consuming. To overcome this issue, this study utilized a novel loading regime consisting of cycle groups with increasing stress amplitude to accelerate the test process. The Palmgren-Minder rule was used to estimate the fatigue life of repaired specimens. Specimens repaired with Mix M (cementitious repair mortar), which was estimated to have the highest 2-million-cycle fatigue endurance limit (77.4%), showed the longest fatigue life (95,991 cycles) during the cyclic loading test, the highest slant, and splitting bond strength among all repair mixes. The estimated two-million cycle fatigue endurance limit of Mix S (70.8%) was very similar to that was reported in literature (71%) using the traditional loading method. This study confirms the usefulness of Palmgren-Minder rule on estimating the fatigue life of repaired specimens. Additionally, the use of the novel loading regime showed the benefit of shortening the test process while producing results similar to those from using traditional loading methods. To improve the prediction accuracy, future research is required to modify the failure criteria to accommodate specimens that may not fail even when the average flexural strength is met.

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Section: Introductionmentioning

confidence: 99%

Performance of Repaired Concrete under Cyclic Flexural Loading

Wang

Gupta

2021

Materials

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“…Various studies have been published on offshore wind turbine systems. As representative instances, certain sequential studies have been performed for spar-type offshore wind turbine systems [39][40][41]. First, the natural frequency of a wind turbine tower with end-mass components was investigated [39].…”

Section: Comprehensive Discussionmentioning

confidence: 99%

Investigation on Applicability and Limitation of Cosine Similarity-Based Structural Condition Monitoring for Gageocho Offshore Structure

Kim

Oh²,

Min³

2022

Sensors

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The key to coping with global warming is reconstructing energy governance from carbon-based to sustainable resources. Offshore energy sources, such as offshore wind turbines, are promising alternatives. However, the abnormal climate is a potential threat to the safety of offshore structures because construction guidelines cannot embrace climate outliers. A cosine similarity-based maintenance strategy may be a possible solution for managing and mitigating these risks. However, a study reporting its application to an actual field structure has not yet been reported. Thus, as an initial study, this study investigated whether the technique is applicable or whether it has limitations in the real field using an actual example, the Gageocho Ocean Research Station. Consequently, it was found that damage can only be detected correctly if the damage states are very similar to the comparison target database. Therefore, the high accuracy of natural frequencies, including environmental effects, should be ensured. Specifically, damage scenarios must be carefully designed, and an alternative is to devise more efficient techniques that can compensate for the present procedure.

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“…It also generates drag forces on the submerged parts of offshore structures. For a large offshore structure such as articulated tower, current load can be an important source of hydrodynamic damping in few cases as studied by Ye and Ji (2019). Ocean currents are a complex component varying with water depth, time, global location, and so on.…”

Section: Mathematical Modeling and Analysismentioning

confidence: 99%

“…Stochastic response of a tension leg platform (TLP) under random wave and current loads was investigated by Oyejobi et al (2016). In a recent paper, Ye and Ji (2019) investigation of current-, wave-, and wind-induced dynamic response of a 5-MW spar-type offshore wind turbine under high, low, and moderate sea states was performed. Coupled response of floating wind turbine by frequency domain approach was presented by Kunpeng et al (2016) who concluded that the influence of aero-hydro-structure coupling should be considered to get reliable analysis results, during the design of offshore towers.…”

Section: Introductionmentioning

confidence: 99%

Effect of current on the dynamic response of a bi-articulated offshore tower

Zaheer

Islam

2020

Advances in Structural Engineering

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Wind and wave loadings have a predominant role in the design of articulated offshore towers for its successful service and survival. Such towers are very sensitive to the dynamic effect of environmental loads. The compliant nature of these towers with environmental loads introduces geometric nonlinearity due to large displacements, which becomes an important consideration in the analysis of these towers. This article deals with the dynamic response of a bi-articulated offshore tower to wind, wave, and current forces. The exposed portion of the tower is subjected to the action of wind, while the submerged portion is acted upon by random wave and current forces. Wind load is modeled by Ochi and Shin spectrum, while the wave load is characterized by Pierson–Moskowitz spectrum. The nonlinear dynamic equations of motion are derived by Hamilton’s principle. Response of the tower is determined by a time domain iterative (Wilson-θ) method. Power spectral density of important parameters such as surge, tilting motion, hinge shear, and bending moment are presented under high and low sea states. It is observed that response of tower due to current modifies the peak energy of power spectral density functions.

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Current, wave, wind and interaction induced dynamic response of a 5 MW spar-type offshore direct-drive wind turbine

Cited by 38 publications

References 27 publications

Performance of Repaired Concrete under Cyclic Flexural Loading

Performance of Repaired Concrete under Cyclic Flexural Loading

Investigation on Applicability and Limitation of Cosine Similarity-Based Structural Condition Monitoring for Gageocho Offshore Structure

Effect of current on the dynamic response of a bi-articulated offshore tower

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Current, wave, wind and interaction induced dynamic response of a 5 MW spar-type offshore direct-drive wind turbine

Cited by 38 publications

References 27 publications

Performance of Repaired Concrete under Cyclic Flexural Loading

Performance of Repaired Concrete under Cyclic Flexural Loading

Investigation on Applicability and Limitation of Cosine Similarity-Based Structural Condition Monitoring for Gageocho Offshore Structure

Effect of current on the dynamic response of a bi-articulated offshore tower

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Current, wave, wind and interaction induced dynamic response of a 5 MW spar-type offshore direct-drive wind turbine