Local shape optimisation of a firtree root using NURBS

Song, Wenbin, Keane, Andy J., Rees, Janet, Bhaskar, Atul and Bagnall, Steven (2002) Local shape optimisation of a firtree root using NURBS. In, Proceedings of the 9th AIAA/ISSMO Symposium on Multidisciplinary Analysis and Optimization. 9th AIAA/ISSMO Symposium on Multidisciplinary Analysis and Optimization Reston, USA, American Institute of Aeronautics and Astronautics.


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This paper describes a general shape
optimisation method for a structural optimisation
problem using a combined feature-based and B-spline
based free form geometry modelling approach. The
geometry is defined by a number of features for the
global shape and by Non-Uniform Rational B-splines
(NURBS), via the use of control points for the local
shape. The coordinates of the control points along
with other dimensions are chosen as design variables.
A knot insertion/removal process is introduced to
increase flexibility and to obtain a compact definition
of the final optimised shape. Here the geometry is
modelled using an intelligent CAD system (ICAD),
which enables complete automation of the design-toanalysis
process. Stresses are obtained from finite
element analysis. A two-stage hybrid strategy is used
to solve the formulated optimisation problem. Its
application to the design of a turbine disc firtree root
is demonstrated. This new approach is compared to a
more traditional optimisation analysis using a
geometry model based on straight-lines and circulararcs.
Improvements in the objective function and
flexibility in geometry definition are achieved
compared to designs obtained using the traditional

Item Type: Book Section
Additional Information: AIAA 2002-5486
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 22798
Date Deposited: 07 Mar 2007
Last Modified: 27 Mar 2014 18:12
Publisher: American Institute of Aeronautics and Astronautics
URI: http://eprints.soton.ac.uk/id/eprint/22798

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