Investigation of the effect of off-axis spar cap plies on damage equivalent loads in wind turbines with superelement blade definition

Gözcü, Ozan; Olgun, Meryem Nisa; Kayran, Altan

doi:10.2514/6.2014-1223

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…The bending torsion coupling degree is realized by changing the ply angle and the asymmetry of the ply. Gozcu et al (2014) also show that the bending torsion coupling effect of the blade can reduce the fatigue load of the wind turbine. Vesel and McNamara (2014) studied the optimal design of blade based on aeroelastic response and bending torsion coupling effect with minimum COE as the optimization objective.…”

Section: Introductionmentioning

confidence: 81%

Sensitivity Study of the Influence of Blade Sectional Stiffness Parameters on the Aeroelastic Response of Wind Turbines

Chen

Wang

2021

Front. Energy Res.

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With the development of wind turbines as a result of large-scale and offshore trends, the wind turbine size is becoming increasingly larger. The passive control technique is used to alleviate the increasing loads on the blade for the sake of improving the durability of the wind turbine. The ply design of shells considering the coupling effect of bending and torsion is one of the passive control techniques. The bending torsion coupling stiffness is one of the parameters of the blade section stiffness matrix. In order to fully understand the influence of each blade stiffness parameter on the aeroelastic responses of wind turbines and to consider the influence of structural characteristics on the aeroelastic responses in blade design, the influences and sensitivity of each stiffness parameter in the 6 × 6 stiffness matrix of the blade sections on the aeroelastic responses of the wind turbines are systematically studied under steady wind condition. The aerodynamic forces in the aeroelastic model are calculated by an AeroDyn module based on blade element momentum theory, and the structural dynamic responses of the blade are calculated using generalized Timoshenko beam theory and geometric exact beam theory. The NREL baseline 5 MW wind turbine and blade properties are used in this study, where the diagonal stiffness parameters and non-diagonal stiffness parameters of the matrixes of each blade section are scaled according to certain principles. The results show that the axial stiffness, the flap-wise stiffness, and the torsional stiffness in the diagonal are sensitive to the root loads and tip displacement of the blade. The flap-wise bending torsion coupling stiffness, the flap-wise shear-torsion coupling stiffness, and the edge-wise shear-torsion coupling stiffness in the non-diagonal are also sensitive to the aeroelastic responses. For completeness, the effects of other stiffness parameters on the aeroelastic responses are also analyzed and discussed.

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Section: Introductionmentioning

confidence: 81%

Sensitivity Study of the Influence of Blade Sectional Stiffness Parameters on the Aeroelastic Response of Wind Turbines

Chen

Wang

2021

Front. Energy Res.

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Evaluation of the Effect of Spar Cap Fiber Angle of Bending–Torsion Coupled Blades on the Aero-Structural Performance of Wind Turbines

Sener

Farsadi

Gözcü

et al. 2018

Journal of Solar Energy Engineering

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This paper presents a comprehensive study of the evaluation of the effect of spar cap fiber orientation angle of composite blades with induced bending–torsion coupling (IBTC) on the aero-structural performance wind turbines. Aero-structural performance of wind turbines with IBTC blades is evaluated with the fatigue load mitigation in the whole wind turbine system, tower clearances, peak stresses in the blades, and power generation of wind turbines. For this purpose, a full E-glass/epoxy reference blade has been designed, following the inverse design methodology for a 5-MW wind turbine. An E-glass/epoxy blade with IBTC and novel, hybrid E-glass/carbon/epoxy blades with IBTC have been designed and aeroelastic time-marching multibody simulations of the 5-MW turbine systems, with the reference blade and the blades with IBTC, have been carried out using six different randomly generated turbulent wind profiles. Fatigue-equivalent loads (FELs) in the wind turbine have been determined as an average of the results obtained from the time response of six different simulations. The results reveal that certain hybrid blade designs with IBTC are more effective in fatigue load mitigation than the E-glass–epoxy blade with IBTC, and besides the fiber orientation angle, sectional properties of hybrid blades must be adjusted accordingly using proper number of carbon/epoxy layers in the sections of the blade with IBTC, in order to simultaneously reduce generator power losses and the FEL.

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Aeroelastic stability evaluation of bend-twist coupled composite wind turbine blades designed for load alleviation in wind turbine systems

Farsadi

Kayran

2016

34th Wind Energy Symposium

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Investigation of the effect of off-axis spar cap plies on damage equivalent loads in wind turbines with superelement blade definition

Cited by 3 publications

References 4 publications

Sensitivity Study of the Influence of Blade Sectional Stiffness Parameters on the Aeroelastic Response of Wind Turbines

Sensitivity Study of the Influence of Blade Sectional Stiffness Parameters on the Aeroelastic Response of Wind Turbines

Evaluation of the Effect of Spar Cap Fiber Angle of Bending–Torsion Coupled Blades on the Aero-Structural Performance of Wind Turbines

Aeroelastic stability evaluation of bend-twist coupled composite wind turbine blades designed for load alleviation in wind turbine systems

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