Seismic centrifuge modelling of suction bucket foundation for offshore wind turbine

Wang, Xuefei; Yang, Xu; Zeng, Xin

doi:10.1016/j.renene.2017.07.103

Cited by 108 publications

(25 citation statements)

References 28 publications

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“…A numerical analysis [6] indicates that the response specific method underestimates the maximum tower-base moment by over 70% compared to the results of time-domain simulation for a parked wind turbine. Some experimental studies [7][8][9][10] also indicate that earthquakes enhance the lateral tower-top displacement significantly to a level that makes it almost impossible to observe meaningful results when using RSM. In comparison, timevarying seismic assessments using the finite element method (FEM) is considered as an alternative method.…”

Section: Introductionmentioning

confidence: 99%

Analysis of seismic behaviour of an offshore wind turbine with a flexible foundation

Yang

Bashir

et al. 2019

Ocean Engineering

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Analysis of seismic behaviour of an offshore wind turbine with a flexible foundation http://researchonline.ljmu.ac.uk/id/eprint/10382/ Article LJMU has developed LJMU Research Online for users to access the research output of the University more effectively. , J (2019) Analysis of seismic behaviour of an offshore wind turbine with a flexible foundation. Ocean Engineering, 178. pp. 215-228. Abstract: This paper investigates the effects of nonlinear soil behaviours on the structural responses of offshore wind turbines (OWTs) subjected to wind, wave and earthquake loadings. A novel seismic analysis framework (SAF) is developed for the assessment of seismic behaviours of OWTs with flexible and fixed foundations. The SAF consists of an improved QuakeDyn module that is implemented into an open source tool (FAST). SAF has been validated through benchmark studies using numerical tools and the results show good agreements. Fully coupled nonlinear simulations have been performed for OWTs with fixed and flexible foundations under operational, parked and emergency shutdown states. The flexible foundation is modelled using nonlinear p-y curves obtained using LPILE. For all the examined operating conditions, notable differences of magnitude and variation in the responses between the flexible and fixed cases are observed, indicating the need for soil effects to be accounted in seismic behaviour analysis of wind turbines. It is further observed that the earthquake induces more severe vibrations on wind turbines with a flexible foundation compared to the one with a fixed base. Also, aerodynamic damping dissipates more energy from earthquake excitation resulting in a smaller tower-top fore-aft displacement. The shutdown triggered by the earthquake causes a 34% increase in the mudline bending moment for the flexible foundation case, while a decreasing trend is observed for the fixed foundation model. Similar observations are made  Corresponding author: lichun_usst@163.com 2 / 41regarding the tower-top displacements. The observations imply that ignoring the soil effect may lead to misjudgement of the consequence of an emergency shutdown. The relative orientation of the ground motion with respect to the wind direction causes significant difference in the seismic behaviour of the wind turbine. This confirms that it is necessary to interchange the horizontal components of an earthquake in order to consider the intersectional effect between ground motion and wind.

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Section: Introductionmentioning

confidence: 99%

Analysis of seismic behaviour of an offshore wind turbine with a flexible foundation

Yang

Bashir

et al. 2019

Ocean Engineering

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“…Wang et al [89] conducted seismic centrifuge modelling to study the behaviour of suction bucket foundations for offshore wind turbines. Nine centrifuge tests were carried out for suction bucket foundations in both dry sand and saturated sandy soil to evaluate the effect of bucket geometry on seismic response by analysing recorded accelerations, pore water pressure ratios, and settlements of both the suction bucket foundation and soil surface.…”

Section: Capacity Of Bucket Foundations Under Cyclic Loading and Eartmentioning

confidence: 99%

Foundations of offshore wind turbines: A review

et al. 2019

Renewable and Sustainable Energy Reviews

364

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Offshore wind is a source of clean, renewable energy of great potential value to the power industry in the context of a low carbon society. Rapid development of offshore wind energy depends on a good understanding of technical issues related to offshore wind turbines, which is spurring ongoing research and development programmes. Foundations of offshore wind turbines present one of the main challenges in offshore wind turbine design. This paper reviews the present state of knowledge concerning geotechnical and structural issues affecting foundation types under consideration for the support structures of offshore wind turbines, and provides recommendations for future research and development.

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“…Offshore wind energy has become an increasingly attractive solution for energy conversion due to the enormous energy potential associated with the vast offshore areas, higher wind speeds, more consistent wind patterns, decreased noise and visual effects for human population centers [1,2]. Most of offshore wind turbines are installed in shallow water (<50 m) on the bottom-fixed foundations, such as monopiles, gravity-based, jackets and bucket foundations [3][4][5]. With the development of offshore wind energy, it is inevitable for a wind farm to move towards the deeper water to harvest stronger and superior wind resource [6].…”

Section: Introductionmentioning

confidence: 99%

Study on the Coupled Dynamic Responses of a Submerged Floating Wind Turbine under Different Mooring Conditions

Ding

2019

Energies

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A submerged floating offshore wind turbine (SFOWT) is proposed for intermediate water depth (50-200 m). An aero-hydro-servo-elastic-mooring coupled dynamic analysis was carried out to investigate the coupled dynamic response of the SFOWT under different mooring conditions subjected to combined turbulent wind and irregular wave environments. The effects of different parameters, namely, the tether length, pretension and the tether failure, on the performance of SFOWT were investigated. It is found that the tether length has significant effects on the motion responses of the surge, heave, pitch and yaw but has little effects on the tower fore-aft displacement and the tether tensions. The increased pretension can result in the increase of the natural frequencies of surge, heave and yaw significantly. The influence of tether failure on the SFOWT performance was investigated by comparing the responses with those of the intact mooring system. The results show that the SFOWT with a broken tether still has a good performance in the operational condition.

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Seismic centrifuge modelling of suction bucket foundation for offshore wind turbine

Cited by 108 publications

References 28 publications

Analysis of seismic behaviour of an offshore wind turbine with a flexible foundation

Analysis of seismic behaviour of an offshore wind turbine with a flexible foundation

Foundations of offshore wind turbines: A review

Study on the Coupled Dynamic Responses of a Submerged Floating Wind Turbine under Different Mooring Conditions

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