Effects of torsional degree of freedom, geometric nonlinearity, and gravity on aeroelastic behavior of large-scale horizontal axis wind turbine blades under varying wind speed conditions

Jeong, Mok-Kun; Cha, Myung-Chan; Kim, Sang Woo; Lee, In; Kim, Taeseong

doi:10.1063/1.4873130

Cited by 28 publications

(28 citation statements)

References 13 publications

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“…Compared with the modal approach, it can handle more DoFs and take geometric nonlinearities into consideration, thus leading to a better representation of blade deformation. As a result, some recent studies focused on the coupling of BEM codes with structural solvers based on the beam theory.…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic analysis of a floating offshore wind turbine in platform‐induced surge motion using a fully coupled CFD‐MBD method

et al. 2018

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Modern offshore wind turbines are susceptible to blade deformation because of their increased size and the recent trend of installing these turbines on floating platforms in deep sea. In this paper, an aeroelastic analysis tool for floating offshore wind turbines is presented by coupling a high‐fidelity computational fluid dynamics (CFD) solver with a general purpose multibody dynamics code, which is capable of modelling flexible bodies based on the nonlinear beam theory. With the tool developed, we demonstrated its applications to the NREL 5 MW offshore wind turbine with aeroelastic blades. The impacts of blade flexibility and platform‐induced surge motion on wind turbine aerodynamics and structural responses are studied and illustrated by the CFD results of the flow field, force, and wake structure. Results are compared with data obtained from the engineering tool FAST v8.

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Section: Introductionmentioning

confidence: 99%

Aeroelastic analysis of a floating offshore wind turbine in platform‐induced surge motion using a fully coupled CFD‐MBD method

et al. 2018

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“…The results in Table 4 show the influence of angular velocity from 0 to 25 RPM on the first 10 natural frequencies of the Rayleigh model. The angular velocity directly affects the centrifugal force and rotary inertia and, in general, on the stiffness matrix, as indicated in equations ( 13) and (25). In the case of the 5MW wind turbine, where the blade rotating at 12.1 RPM, Table 4 shows that the fundamental mode frequency increases by 10% compared with the fundamental frequency for a non-rotating blade at rotating speed 0 RPM in the same Table 4.…”

Section: Resultsmentioning

confidence: 95%

“…The first 10 natural frequencies results of a single 5MW NREL blade with adopting different theories at zero rotation speed and without aerodynamic forces are compared together and with data from 8,13,25 are listed in Table 2. The results showed a good agreement of five models with the literature results, which indicated the appropriateness of the presented models using the finite element code.…”

Section: Resultsmentioning

confidence: 99%

Comparison of beam theories for characterisation of a NREL wind turbine blade flap-wise vibration

Algolfat

Wang

Albarbar

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Offshore wind turbine blades significantly differ from their onshore counterparts. With the increasing sizes, the hostile weather operational conditions, and the need to protect them against damage and breakdown, structural dynamics analysis is an essential and popular approach. An accurate and computationally simple model is desirable in the application of online structural health monitoring. For example using a digital twin of such structure. Free vibration investigation is a fundamental step for the analysis of structural dynamics. When a rotating blade deflects either in the plane of rotation or perpendicular to it, the centrifugal force on each blade exerts inertia force along the blade span, which has the effect of stiffening the blade and, as a result increasing the natural frequencies compared with the stationary ones. However, the influence of different blade parameters on the flap-wise vibrations is not very well understood. In this paper, the blade of horizontal axis wind turbines (HAWT) is modelled using different beam theories to pursue the effect of adding the different parameters on the dynamic modal characteristics. The examined models have been used to determine the natural frequencies and mode shapes of the National Renewable Energy Laboratory (NREL) 5-MW wind turbine. Results demonstrate that increasing angular velocity has a significant impact on the natural frequencies and mode shapes. The rotary inertia is found to impact the free vibration responses of the studied blades. Moreover, increasing hub radius, pre-cone and pitch angles are found to have less influence on the natural frequencies. Compared to the other investigated methods, Bernoulli’s based algorithms are found to produce less accurate results

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“…Also listed are frequencies from GH Bladed, an industrial software package for wind turbine analysis, that were computed as part of the present investigation. Both ADAMs and GH Bladed have been demonstrated to provide high fidelity for predicting mode frequencies [12] and the frequencies obtained by all these codes are quite close. Compared to NREL's models, it can be found that Bladed performs well; despite that default values were used for many of the GH Bladed inputs (because some values of the baseline design were not available).…”

Section: Tower Structural Modelmentioning

confidence: 81%

Hydraulic-electric hybrid wind turbines: Tower mass saving and energy storage capacity

2016

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a b s t r a c tThis study investigates concept of introduction of a hydraulic motor in the nacelle to convert rotor shaft work into hydraulic power that is transmitted to the electric generator at ground/sea level. This combination of hydraulic and electric power generation can help simplify or even eliminate the gearbox, and significantly reduce the head weight mass that the tower needs to support. Also, this hybrid concept allows energy storage in the tower which can reduce electric generator size. The analytical technique for tower mass savings employed herein was validated and used to show that 33%e50% of the tower mass may be saved through decreased tower thickness. In addition, the hydraulic-electric generator concept is compatible with employing isothermal CAES in the tower. Analysis based on cross-over pressure for the design limit indicates that this energy storage concept provides more than 24 h of energy storage if one considers S-glass towers of 10 MW or more. To accompany the above engineering analysis, a CAPEX cost model was developed based on recent production wind turbines and system designs. The hydraulicelectric hybrid system with CAES was estimated to yield a total CAPEX savings of 17% due to a substantial decrease in generator and electrical infrastructure costs.

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Effects of torsional degree of freedom, geometric nonlinearity, and gravity on aeroelastic behavior of large-scale horizontal axis wind turbine blades under varying wind speed conditions

Cited by 28 publications

References 13 publications

Aeroelastic analysis of a floating offshore wind turbine in platform‐induced surge motion using a fully coupled CFD‐MBD method

Aeroelastic analysis of a floating offshore wind turbine in platform‐induced surge motion using a fully coupled CFD‐MBD method

Comparison of beam theories for characterisation of a NREL wind turbine blade flap-wise vibration

Hydraulic-electric hybrid wind turbines: Tower mass saving and energy storage capacity

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