Dynamic analysis of an integrated offshore structure comprising a jacket-supported offshore wind turbine and aquaculture steel cage

Li, Na; Han, Xu; Li, Xin; Verma, Amrit Shankar

doi:10.1016/j.oceaneng.2023.114059

Cited by 13 publications

(4 citation statements)

References 29 publications

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“…The accurate estimation of the wind turbine natural frequencies and damping has a pronounced effect on the design loads, lifetime prediction, and dynamic response of the system [5]. In the design of jacket-supported OWTs, the resonance effects of wind and wave loads should be avoided, and a dynamic response analysis of the structure is necessary [6,7]. While the modal parameters are assumed as constants during the design, they actually can vary during the operation of OWTs.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Modal Parameters of a Jacket Offshore Wind Turbine to Operational Conditions

Partovi-Mehr,

Branlard,

Song

et al. 2023

JMSE

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Accurate estimation of offshore wind turbine (OWT) modal parameters has a prominent effect on the design loads, lifetime prediction, and dynamic response of the system. Modal parameters can vary during the operation of OWTs. This paper studies the variation and sensitivity analysis of an OWT’s modal parameters with respect to operational and environmental conditions. Three finite element models of a jacket-supported OWT at the Block Island Wind Farm are created within the OpenSees, SAP2000, and OpenFAST platforms and validated using experimental measurements. The OpenFAST model is used to simulate the modal parameters of the turbine under various wind speed, rotor speed, power, yaw angle, mean sea level, blade pitch angle, and soil spring values. The model-predicted modal parameters of the first fore–aft (FA) and side–side (SS) modes are compared to those identified from experimental measurements. Results from the simulations show that the first FA natural frequency and damping ratio mostly depend on the rotor speed and wind speed, respectively, while yaw angle and mean sea level do not have a visible effect. It is observed that there is about 8% stiffening in the first FA frequency and an aerodynamic damping of 7.5% during the operation of the OWT.

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Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Modal Parameters of a Jacket Offshore Wind Turbine to Operational Conditions

Partovi-Mehr,

Branlard,

Song

et al. 2023

JMSE

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“…Some scholars have proposed new foundations for integrating cages based on different types of offshore wind turbine foundations. For example, Li et al [44] based their study on the jacket foundation, Zhai et al [45] based their study on the barge foundation, and Zhang et al [46] based their study on the semi-submersible foundation. They independently proposed an offshore wind turbine foundation integrated with a net cage and established numerical models to conduct dynamic analysis of the whole structure and evaluate the impact of additional netting on the structure.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Tu,

Zhang,

Liu

et al. 2023

JMSE

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The integrated development of offshore wind power and marine aquaculture is becoming increasingly important. However, the impact mechanism of integrating a net cage on the dynamic characteristics of offshore wind turbines remains unclear. This paper presents a design scheme for a multi-pile-supported offshore wind turbine integrated with an aquaculture net cage and conducts a preliminary theoretical analysis of the influence of an additional net cage on the wind turbine. The analysis reveals that the primary effect is an increase in hydrodynamic loads on the wind turbine foundation, while the structural frequency of the wind turbine remains largely unaffected. Furthermore, computational fluid dynamics (CFD) numerical models, whose accuracy is verified by physical experiments, are utilized to compare the hydrodynamic characteristics of the offshore wind turbine foundation with and without the net cage, considering different net solidities. The simulations identify significant changes in the flow field surrounding the foundation due to the presence of the net cage, resulting in a considerable increase in the overall hydrodynamic load on the foundation. Moreover, the mutual interference between the netting and the foundation amplifies their respective hydrodynamic loads and concentrates these loads at the upstream section of the structure. The maximum increase in hydrodynamic load for a single pile reaches 6.32 times its original value, posing significant risks to the structure. Finally, a preliminary feasibility analysis of the scheme was conducted. The results presented in this article can serve as a theoretical basis for the design of such innovative structures.

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“…The standard deviations of heave and pitch motions of the helical type of floating wind turbine are slightly smaller than those of floating HAWT, while the standard deviations of surge and yaw motions are larger [22]. A hydraulic transmission applied to a utility-scale spar floating wind turbine eliminates the need for a gearbox and potentially improves the turbine reliability [23][24][25]. The GMPOP-based method, which is an effective way to assess the dynamical alteration of wind turbine, can successfully detect the state anomalies before the occurrence of the outer race fault and inner race fault, and provide anomaly alarms in advance [26].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Flexible Multi-Body in Large Wind Turbines: A Review

Xue

Zhang

2023

Sustainability

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Dynamic response of flexible multi-body large wind turbines has been quickly growing in recent years. With the new normal economic policy, the economy of China is developing innovatively and stably. New energy development and utilization is an important strategy for people’s lives and economic development around the world. It is feasible to analyze from a broad perspective. In particular, the development and application of wind power is affecting the economic development of industry to a certain extent. Persistent and significant large wind turbines have cast concern over the prospects of wind power technology, and a comprehensive development potential of wind power technology has been analyzed its potential use in the future. The multi-body dynamics method can better analyze and describe the impact of flexible blade elastic deformation on motion characteristics and provides a practical analysis method for the aeroelastic stability analysis and control system design of wind turbines.

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Dynamic analysis of an integrated offshore structure comprising a jacket-supported offshore wind turbine and aquaculture steel cage

Cited by 13 publications

References 29 publications

Sensitivity Analysis of Modal Parameters of a Jacket Offshore Wind Turbine to Operational Conditions

Sensitivity Analysis of Modal Parameters of a Jacket Offshore Wind Turbine to Operational Conditions

Hydrodynamic Analysis of a Multi-Pile-Supported Offshore Wind Turbine Integrated with an Aquaculture Cage

Dynamic Response of a Flexible Multi-Body in Large Wind Turbines: A Review

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