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Shape optimisation using CAD linked free-form deformation

Published online by Cambridge University Press:  27 January 2016

A. Nurdin ,
N. W. Bressloff ,
A. J. Keane  and
C. M. E. Holden
A. Nurdin
Affiliation:
University of Southampton, Southampton, England, UK
N. W. Bressloff
Affiliation:
University of Southampton, Southampton, England, UK
A. J. Keane*
Affiliation:
University of Southampton, Southampton, England, UK
C. M. E. Holden
Affiliation:
Airbus Operations Limited, Bristol, England, UK
*
[email protected]
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Abstract

Free-form deformation (FFD) is a method first introduced within the graphics industry to enable flexible deformation of geometric models. FFD uses an R3 to R3 mapping of a deformable space to the global Cartesian space to produce the geometry deformation. This method has been extensively used within the design optimisation field as a shape parameterisation technique. Typically it has been used to parameterise analysis meshes, where new design geometries are produced by deforming the original mesh. This method allows a concise set of design variables to be used while maintaining a flexible shape representation. However, if a computer aided design (CAD) model of the resulting geometry is required, reverse engineering techniques would need to be utilised to recreate the model from the deformed mesh. This paper extends the use of FFD within an optimisation routine by using FFD to directly parameterise a CAD geometry. Two methods of linking the FFD methods with the CATIA V5 CAD package are presented. Each CAD integration technique is then critiqued with respect to shape optimisation. Finally the set-up and initialisation of a case study is illustrated. The case study chosen is the aerodynamic optimisation of the wing-fuselage junction of a typical passenger aircraft.

Type
Research Article
Information
The Aeronautical Journal , Volume 116 , Issue 1183 , September 2012 , pp. 915 - 939
Copyright
Copyright © Royal Aeronautical Society 2012 

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