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Improved aerostructural performance via aeroservoelastic tailoring of a composite wing

Published online by Cambridge University Press:  20 June 2018

Eduardo P. Krupa ,
Jonathan E. Cooper ,
Alberto Pirrera  and
Raj Nangia
Eduardo P. Krupa*
Affiliation:
Department of Aerospace Engineering, University of Bristol, Bristol, UK
Jonathan E. Cooper
Affiliation:
Department of Aerospace Engineering, University of Bristol, Bristol, UK
Alberto Pirrera
Affiliation:
Department of Aerospace Engineering, University of Bristol, Bristol, UK
Raj Nangia
Affiliation:
Department of Aerospace Engineering, University of Bristol, Bristol, UK
*
eduardo.krupa@bristol.ac.uk
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Abstract

This paper investigates the synergies and trade-offs between passive aeroelastic tailoring and adaptive aeroelastic deformation of a transport composite wing for fuel burn minimisation. This goal is achieved by optimising thickness and stiffness distributions of constitutive laminates, jig-twist shape and distributed control surface deflections through different segments of a nominal “cruise-climb” mission. Enhanced aerostructural efficiency is sought both passively and adaptively as a means of aerodynamic load redistribution, which, in turn, is used for manoeuvre load relief and minimum drag dissipation. Passive shape adaptation is obtained by embedding shear-extension and bend-twist couplings in the laminated wing skins. Adaptive camber changes are provided via full-span trailing-edge flaps. Optimised design solutions are found using a bi-level approach that integrates gradient-based and particle swarm optimisations in order to tailor structural properties at rib-bay level and retrieve blended stacking sequences. Performance benefits from the combination of passive aeroelastic tailoring with adaptive control devices are benchmarked in terms of fuel burn and a payload-range efficiency. It is shown that the aeroservoelastically tailored composite design allows for significant weight and fuel burn improvements when compared to a similar all-metallic wing. Additionally, the trailing-edge flap augmentation can extend the aircraft performance envelope and improve the overall cruise span efficiency to nearly optimal lift distributions.

Keywords

Adaptive trailing-edge devicesfuel burn minimisationcomposite wingaeroservoelastic tailoring
Type
Research Article
Information
The Aeronautical Journal , Volume 122 , Issue 1255 , September 2018 , pp. 1442 - 1474
Copyright
Copyright © Royal Aeronautical Society 2018 

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