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Dynamic modelling and actuation of the adaptive torsion wing

Dynamic modelling and actuation of the adaptive torsion wing
Dynamic modelling and actuation of the adaptive torsion wing
This paper presents the dynamical modelling of a novel Active Aeroelastic Structure (AAS). The Adaptive Torsion Wing (ATW) concept is a thin-wall, two-spar wingbox whose torsional stiffness can be adjusted by translating the spar webs in the chordwise direction inward and towards each other using internal actuators. The reduction in torsional stiffness allows external aerodynamic loads to induce twist on the structure and maintain its deformed shape. The ATW system is here considered as integrated within the wing of a representative UAV to replace conventional ailerons and provide roll control. The ATW is modelled as a two-dimensional equivalent aerofoil using bending and torsion shape functions to express the equations of motion in terms of the twist angle and plunge displacement at the wingtip. The full equations of motion for the ATW equivalent aerofoil were derived using Lagrangian mechanics. The aerodynamic lift and moment acting on the aerofoil were modelled using Theodorsen’s unsteady aerodynamic theory. A low-dimensional state-space representation of an empirical Theodorsen’s transfer function was adopted to allow time-domain analyses. Four actuation strategies were investigated. Figures of merit including plunge displacement, twist angle, actuation forces, and actuation powers were quantified and discussed for each of the scenarios. This study allows the conceptual design and sizing of the internal actuators that are required to drive the webs.
morphing, aeroelastic, uav, torsion, wing
1045-389X
2045-2057
Ajaj, R.M.
ff8ce68d-2ba5-449e-83da-f2be54e6d409
Friswell, Michael
226b5da8-4003-4d90-bcdb-2dfad9dfe60c
Dettmer, Wulf G.
8ba4c988-4fca-48d8-b30e-a82613e33132
Allegri, Giuliano
5afa0901-0cff-4cc9-b481-af2d5d501baa
Isikveren, Askin
f2798f39-eef1-4679-b074-ce5c4966883c
Ajaj, R.M.
ff8ce68d-2ba5-449e-83da-f2be54e6d409
Friswell, Michael
226b5da8-4003-4d90-bcdb-2dfad9dfe60c
Dettmer, Wulf G.
8ba4c988-4fca-48d8-b30e-a82613e33132
Allegri, Giuliano
5afa0901-0cff-4cc9-b481-af2d5d501baa
Isikveren, Askin
f2798f39-eef1-4679-b074-ce5c4966883c

Ajaj, R.M., Friswell, Michael, Dettmer, Wulf G., Allegri, Giuliano and Isikveren, Askin (2013) Dynamic modelling and actuation of the adaptive torsion wing. Journal of Intelligent Materials Systems and Structures, 24 (16), 2045-2057. (doi:10.1177/1045389X12444493).

Record type: Article

Abstract

This paper presents the dynamical modelling of a novel Active Aeroelastic Structure (AAS). The Adaptive Torsion Wing (ATW) concept is a thin-wall, two-spar wingbox whose torsional stiffness can be adjusted by translating the spar webs in the chordwise direction inward and towards each other using internal actuators. The reduction in torsional stiffness allows external aerodynamic loads to induce twist on the structure and maintain its deformed shape. The ATW system is here considered as integrated within the wing of a representative UAV to replace conventional ailerons and provide roll control. The ATW is modelled as a two-dimensional equivalent aerofoil using bending and torsion shape functions to express the equations of motion in terms of the twist angle and plunge displacement at the wingtip. The full equations of motion for the ATW equivalent aerofoil were derived using Lagrangian mechanics. The aerodynamic lift and moment acting on the aerofoil were modelled using Theodorsen’s unsteady aerodynamic theory. A low-dimensional state-space representation of an empirical Theodorsen’s transfer function was adopted to allow time-domain analyses. Four actuation strategies were investigated. Figures of merit including plunge displacement, twist angle, actuation forces, and actuation powers were quantified and discussed for each of the scenarios. This study allows the conceptual design and sizing of the internal actuators that are required to drive the webs.

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e-pub ahead of print date: July 2012
Published date: November 2013
Additional Information: Funded by European Commission - FP7: Optimisation of multiscale structures with applications to morphing aircraft (OMSAMA) (247045)
Keywords: morphing, aeroelastic, uav, torsion, wing
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 358926
URI: http://eprints.soton.ac.uk/id/eprint/358926
ISSN: 1045-389X
PURE UUID: ca1bb1d0-9a8a-4af1-9643-e86d34904a9c

Catalogue record

Date deposited: 15 Oct 2013 14:07
Last modified: 20 Nov 2021 15:52

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Contributors

Author: R.M. Ajaj
Author: Michael Friswell
Author: Wulf G. Dettmer
Author: Giuliano Allegri
Author: Askin Isikveren

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