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Stiffness Optimization of Composite Wings with Aeroelastic Contraints

Dillinger, Johannes and Abdalla, M.M. and Klimmek, Thomas and Gürdal, Z. (2012) Stiffness Optimization of Composite Wings with Aeroelastic Contraints. In: 2012 AIAA Conference Proceedings. 12th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference and 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 17.-19. Sept. 2012, Indianapolis/Indiana, USA.

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Abstract

The drive for ever more efficient aircraft structures stimulates the research to use the full potential of anisotropy of composite materials. The stiffness optimization of the upper and lower skins of a composite wing is demonstrated in this paper. The wing was optimized taking into consideration mass, strength, buckling, aerodynamic twist and aileron effectiveness. The elements of the inplane and bending stiffness matrices and laminate thicknesses were used as design variables. Static aeroelastic analysis was performed using Nastran to find the responses of the structure and their sensitivities to the design variables. The results of aeroelastic finite element analysis were processed to create efficient structural approximations of the responses. The approximations were used by a gradient based optimizer to update the design variables. The separable and continuous approximations in terms of the design variables allowed for the use of efficient parallel computing strategies, where single or multi-modal objective functions were minimized. The first numerical results for a generic wing confirmed a functional setup for multi load case stiffness optimizations with aeroelastic design responses. Stiffness optimized unbalanced laminates demonstrated a clear advantage over balanced laminates for mass or aileron effectiveness optimization, with constraints on strength and buckling.

Item URL in elib:https://elib.dlr.de/79181/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Stiffness Optimization of Composite Wings with Aeroelastic Contraints
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dillinger, Johannesjohannes.dillinger (at) dlr.deUNSPECIFIED
Abdalla, M.M.Aerospace Structures, Delft University of TechnologyUNSPECIFIED
Klimmek, Thomasthomas.klimmek (at) dlr.deUNSPECIFIED
Gürdal, Z.Aerospace Structures, Delft University of TechnologyUNSPECIFIED
Date:2012
Journal or Publication Title:2012 AIAA Conference Proceedings
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Accepted
Keywords:aeroelasticity, composite optimization, lamination parameter, aeroelastic tailoring
Event Title:12th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference and 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference
Event Location:Indianapolis/Indiana, USA
Event Type:international Conference
Event Dates:17.-19. Sept. 2012
Organizer:The American Institute of Aeronautics and Astronautics (AIAA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:19 Dec 2012 17:03
Last Modified:19 Dec 2012 17:03

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