An Application of the Autogyro Theory to Airborne Wind Energy Extraction

Rimkus, Sigitas; Das, Tuhin

doi:10.1115/dscc2013-3840

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…G. Sánchez-Arriaga et al: Dynamic analysis of the tensegrity structure of a RAWE machine An interesting subfamily of AWE systems involves concepts based on rotating kites or rotors that use the wellknown phenomenon of auto-rotation for harvesting wind energy (Rimkus and Das, 2013). An example is a tethered autogyro system with four rotors in a quadrotor configuration that harvests energy and transmits it to the ground via the tether (Mackertich and Das, 2016).…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of the tensegrity structure of a rotary airborne wind energy machine

Sánchez-Arriaga,

Cerrillo-Vacas,

Unterweger

et al. 2024

Wind Energ. Sci.

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Abstract. The dynamic behavior of the tensegrity structure (helix) of a rotary airborne wind energy (RAWE) machine was investigated by combining experimental and numerical techniques. Taking advantage of the slenderness of the helix, a dynamic model for the evolution of its center line and the torsional deformation was developed by using Cosserat theory. The constitutive relations for the axial, bending, and torsional stiffness, which are a fundamental component of the model, were obtained experimentally by carrying out laboratory tests. Three scenarios of increasing complexity were then studied with the numerical tool. Firstly, a stationary solution of the model, i.e., with fixed ends and no rotation, was found numerically and used to verify the correct implementation of a numerical code based on finite elements. The stability analysis of this solution, which corresponds to the state of the structure just after deployment but before operation, showed that the natural periods of longitudinal, lateral, and torsional modes of the RAWE structure under consideration are around 0.03, 0.2, and 0.4 s, respectively. Secondly, the dynamics in nominal operation was investigated by keeping both end tips fixed and implementing a controller that adjusts the torque at the ground to reach a target angular velocity of 120 rpm. Key characteristic variables like the tension and the response times of the helix were obtained. Thirdly, the dynamics of the helix when the lower end is fixed and the upper end is driven in a circular motion of frequency f1 was studied experimentally and numerically. The tension of the helix in the experiment increased for f1 above a certain threshold, and the structure collapsed at f1≈5 Hz. Simulation analysis revealed a resonance of the structure at a higher frequency (around 13 Hz).

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Section: Introductionmentioning

confidence: 99%

Dynamic analysis of the tensegrity structure of a rotary airborne wind energy machine

Sánchez-Arriaga,

Cerrillo-Vacas,

Unterweger

et al. 2024

Wind Energ. Sci.

View full text Add to dashboard Cite

show abstract

“…An interesting subfamily of AWE systems involves concepts based on rotating kites or rotors that use the well-known phenomenon of auto-rotation for harvest wind energy (Rimkus and Das, 2013). An example is a tethered autogyro system with four rotors in a quadrotor configuration that harvests energy and transmits it to the ground via the tether (Mackertich and Das, 2016).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of the Tensegrity Structure of a Rotary Airborne Wind Energy Machine

Sanchez-Arriaga,

Cerrillo-Vacas,

Unterweger

et al. 2023

Preprint

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Abstract. The dynamic behavior of the tensegrity structure (helix) of a Rotary Wind Energy (RAWE) machine was investigated by combining experimental and numerical techniques. Taking advantage of the slenderness of the helix, a dynamic model for the evolution of its center line and the torsional deformation was developed by using Cosserat theory. The constitutive relations for the axial, bending and torsional stiffness, which are a fundamental component of the model, were obtained experimentally by carrying out laboratory tests. Three scenarios of increasing complexity were then studied with the numerical tool. Firstly, a stationary solution of the model, i.e. with fixed ends and no rotation, was found numerically and used to verify the correct implementation of a numerical code based on finite elements. The stability analysis of this solution, which corresponds to the state of the structure just after deployment but before operation, showed that the natural periods of longitudinal, lateral, and torsional modes of the RAWE structure under consideration are around 0.03 s, 0.2 s and 0.4 s, respectively. Secondly, the dynamic in nominal operation was investigated by keeping fixed both end tips and implementing a controller that adjusts the torque at the ground to reach a target angular velocity of 120 rpm. Key characteristic variables like the tension and the response times of the helix were obtained. Thirdly, the dynamic of the helix when the lower end is fixed and the upper end is driven in a circular motion of frequency f1 was studied experimentally and numerically. The helix's tension in the experiment increased for f1 above certain threshold and the structure collapsed at f1 ≈ 5 Hz. Simulation analysis revealed a resonance of the structure at a frequency higher to the one observed in the experiment (around 13 Hz).

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An Application of the Autogyro Theory to Airborne Wind Energy Extraction

Cited by 5 publications

References 12 publications

Dynamic analysis of the tensegrity structure of a rotary airborne wind energy machine

Dynamic analysis of the tensegrity structure of a rotary airborne wind energy machine

Dynamic Analysis of the Tensegrity Structure of a Rotary Airborne Wind Energy Machine

Kite Networks for HarvestingWind Energy

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