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Ram-Air Kite Reinforcement Optimisation for Airborne Wind Energy Applications. / Thedens, Paul; Schmehl, Roland.

2017. 141-141 Abstract from Airborne Wind Energy Conference 2017, Freiburg, Germany.

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Thedens, Paul ; Schmehl, Roland. / Ram-Air Kite Reinforcement Optimisation for Airborne Wind Energy Applications. Abstract from Airborne Wind Energy Conference 2017, Freiburg, Germany.1 p.

BibTeX

@conference{24b874d0834d461384d4fe3c1f8cc682,
title = "Ram-Air Kite Reinforcement Optimisation for Airborne Wind Energy Applications",
abstract = "Ram-air kites are made of thin coated woven fabric and are attractive for the airborne wind energy industry due to their low weight and easy storage ability. The aerodynamic load is transferred from the top canopy through the ribs into the bridle system causing high stresses on the ribs. In order to spread the load as equally as possible, reinforcements are added on the ribs which also sustain the airfoil shape. The most common reinforcement strategy is to simply sewadditional fabric onto highly stressed locations of the ribs. For the kite designer one of the challenges is to find a balance between the right amount and orientation of reinforcements, and the extra weight added to the structure. In this study the layout of a rib reinforcement used in ramair kites is expressed as an optimization problem. The objective is to find an optimum reinforcement layout such that the deformation of the rib is minimized. Also, the force fromthe kite acting onthe tether is included into the expression and should be maximized, leading to a multidisciplinary optimization (MDO). For simplicity, the optimization is initially done in a twodimensional analysis of the flow and structure. To obtain the aerodynamic pressure acting on the rib the panel method software XFOIL [1] is utilized. The resultant deformations are computed with the finite elementmethod which takes the position of the reinforcements into account, augmenting the element’s stiffness based on [2]. Finally the optimum layout is found with a gradient based optimization method. The optimization is easily extendable to 3D which will eventually yield a more realistic load case acting on the rib structure due three-dimensional floweffects. Also the inflated kite structure in three dimensions behaves considerably different due to the curvature of the canopy.",
author = "Paul Thedens and Roland Schmehl",
year = "2017",
doi = "10.4233/uuid:4c361ef1-d2d2-4d14-9868-16541f60edc7",
language = "English",
pages = "141--141",
note = "Airborne Wind Energy Conference 2017, AWEC 2017 ; Conference date: 05-10-2017 Through 06-10-2017",

}

RIS

TY - CONF

T1 - Ram-Air Kite Reinforcement Optimisation for Airborne Wind Energy Applications

AU - Thedens, Paul

AU - Schmehl, Roland

PY - 2017

Y1 - 2017

N2 - Ram-air kites are made of thin coated woven fabric and are attractive for the airborne wind energy industry due to their low weight and easy storage ability. The aerodynamic load is transferred from the top canopy through the ribs into the bridle system causing high stresses on the ribs. In order to spread the load as equally as possible, reinforcements are added on the ribs which also sustain the airfoil shape. The most common reinforcement strategy is to simply sewadditional fabric onto highly stressed locations of the ribs. For the kite designer one of the challenges is to find a balance between the right amount and orientation of reinforcements, and the extra weight added to the structure. In this study the layout of a rib reinforcement used in ramair kites is expressed as an optimization problem. The objective is to find an optimum reinforcement layout such that the deformation of the rib is minimized. Also, the force fromthe kite acting onthe tether is included into the expression and should be maximized, leading to a multidisciplinary optimization (MDO). For simplicity, the optimization is initially done in a twodimensional analysis of the flow and structure. To obtain the aerodynamic pressure acting on the rib the panel method software XFOIL [1] is utilized. The resultant deformations are computed with the finite elementmethod which takes the position of the reinforcements into account, augmenting the element’s stiffness based on [2]. Finally the optimum layout is found with a gradient based optimization method. The optimization is easily extendable to 3D which will eventually yield a more realistic load case acting on the rib structure due three-dimensional floweffects. Also the inflated kite structure in three dimensions behaves considerably different due to the curvature of the canopy.

AB - Ram-air kites are made of thin coated woven fabric and are attractive for the airborne wind energy industry due to their low weight and easy storage ability. The aerodynamic load is transferred from the top canopy through the ribs into the bridle system causing high stresses on the ribs. In order to spread the load as equally as possible, reinforcements are added on the ribs which also sustain the airfoil shape. The most common reinforcement strategy is to simply sewadditional fabric onto highly stressed locations of the ribs. For the kite designer one of the challenges is to find a balance between the right amount and orientation of reinforcements, and the extra weight added to the structure. In this study the layout of a rib reinforcement used in ramair kites is expressed as an optimization problem. The objective is to find an optimum reinforcement layout such that the deformation of the rib is minimized. Also, the force fromthe kite acting onthe tether is included into the expression and should be maximized, leading to a multidisciplinary optimization (MDO). For simplicity, the optimization is initially done in a twodimensional analysis of the flow and structure. To obtain the aerodynamic pressure acting on the rib the panel method software XFOIL [1] is utilized. The resultant deformations are computed with the finite elementmethod which takes the position of the reinforcements into account, augmenting the element’s stiffness based on [2]. Finally the optimum layout is found with a gradient based optimization method. The optimization is easily extendable to 3D which will eventually yield a more realistic load case acting on the rib structure due three-dimensional floweffects. Also the inflated kite structure in three dimensions behaves considerably different due to the curvature of the canopy.

UR - http://resolver.tudelft.nl/uuid:7975b130-3c6e-4289-bb9f-394d2be09804

U2 - 10.4233/uuid:4c361ef1-d2d2-4d14-9868-16541f60edc7

DO - 10.4233/uuid:4c361ef1-d2d2-4d14-9868-16541f60edc7

M3 - Abstract

SP - 141

EP - 141

ER -

ID: 30640845