Exploiting Bend-Twist Coupling in Wind Turbine Control for Load Reduction

Wiens, Marcus; Meyer, Tobias; Wenske, Jan

doi:10.1016/j.ifacol.2020.12.781

Cited by 6 publications

(5 citation statements)

References 11 publications

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“…While these stress states are dominated by normal stresses due to bending in case of a high blade stiffness, modern rotor blades tend to be more flexible to limit bending stresses. Passive load control features such as bend-twist-coupling 13,14 also introduce higher torsional loads in order to limit bending loads. These developments contribute to a more significant influence of multiaxial and non-proportional load states.…”

Section: Multiaxial Stresses In Bond Lines Of Wind Turbine Rotor Bladesmentioning

confidence: 99%

Effects of non-proportionality and tension-compression asymmetry on the fatigue life prediction of equivalent stress criteria

Wentingmann

Manousides

Antoniou

et al. 2023

Preprint

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Biaxial tension/compression-torsion fatigue tests with varying levels of non-proportionality were performed employing a structural adhesive designed for wind turbine rotor blades. The cycles to failure were found to be independent of the level of non-proportionality. It is demonstrated that numerical fatigue life predictions via rainflow-counted equivalent stress histories are not able to replicate these experimental observations and overestimate the fatigue life up to a hundredfold. The tension-compression asymmetry of the adhesive resulted in significant damage prediction differences depending on the stress space representation of the Haigh diagram. If not properly taken care of, the asymmetry will also lead to non-conservative results. While demonstrated with a short fiber reinforced adhesive, the results can be transferred to other materials.

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Section: Multiaxial Stresses In Bond Lines Of Wind Turbine Rotor Bladesmentioning

confidence: 99%

Effects of non-proportionality and tension-compression asymmetry on the fatigue life prediction of equivalent stress criteria

Wentingmann

Manousides

Antoniou

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The control system showed a high-level of performance. Colombo et al [4] proved a robust sliding mode approach control using the pitch as a control input; the proposed solution was validated through simulation of a 5 MW wind turbine; similarly, a novel control was presented by Wiens et al [5]. This method was used to mitigate the gust effects using a collective twist and pitch control; as a result, the simulations revealed that this control could lead to the reduction of loads in the turbine.…”

Section: Introductionmentioning

confidence: 95%

The Effect of a Flexible Blade for Load Alleviation in Wind Turbines

et al. 2021

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This article presents the analysis of the performance of a flexible wind turbine blade. The simulation analysis is based on a 3 m span blade prototype. The blade has a flexible surface and a cam mechanism that modifies the aerodynamic profile and adapts the surface to different configurations. The blade surface was built with a flexible fiberglass composite, and the internal mechanism consists of a flexible structure actuated with an eccentric cam. The cam mechanism deforms five sections of the blade, and the airfoil geometry for each section was measured from zero cam displacement to full cam displacement. The measured data were interpolated to obtain the aerodynamic profiles of the five sections to model the flexible blade in the simulation process. The simulation analysis consisted of determining the different aerodynamic coefficients for different deformed surfaces and a range of wind speeds. The aerodynamic coefficients were calculated with the BEM method (QBlade®); as a result, the data performance of the flexible blade was compared for the different deformation configurations. Finally, a decrease of up to approximately 6% in the mean bending moment suggests that the flexible turbine rotor presented in this article can be used to reduce extreme and fatigue loads on wind turbines.

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“…11,12 While these stress states are dominated by normal stresses due to bending in case of a high blade stiffness, modern rotor blades tend to be more flexible to limit bending stresses. Passive load control features such as bend-twist coupling 13,14 also introduce higher torsional loads in order to limit bending loads. These developments contribute to a more significant influence of multiaxial and nonproportional load states.…”

Section: Introductionmentioning

confidence: 99%

Effects of non‐proportionality and tension–compression asymmetry on the fatigue life prediction of equivalent stress criteria

Wentingmann

Manousides

Antoniou

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Biaxial tension/compression–torsion fatigue tests with varying levels of non‐proportionality were performed employing a structural adhesive designed for wind turbine rotor blades. The cycles to failure were found to be independent of the level of non‐proportionality. It is demonstrated that numerical fatigue life predictions via rainflow‐counted equivalent stress histories are not able to replicate these experimental observations and overestimate the fatigue life up to a hundredfold. The tension–compression asymmetry of the adhesive resulted in significant damage prediction differences depending on the stress space representation of the Haigh diagram. If not properly taken care of, the asymmetry will also lead to non‐conservative results. While demonstrated with a short fiber‐reinforced adhesive, the results can be transferred to other materials.

show abstract

Exploiting Bend-Twist Coupling in Wind Turbine Control for Load Reduction

Cited by 6 publications

References 11 publications

Effects of non-proportionality and tension-compression asymmetry on the fatigue life prediction of equivalent stress criteria

Effects of non-proportionality and tension-compression asymmetry on the fatigue life prediction of equivalent stress criteria

The Effect of a Flexible Blade for Load Alleviation in Wind Turbines

Effects of non‐proportionality and tension–compression asymmetry on the fatigue life prediction of equivalent stress criteria

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