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Stiffness Optimization of Composite Wings with Aeroelastic Constraints

Dillinger, Johannes and Klimmek, Thomas and Abdalla, M.M. and Gürdal, Z. (2013) Stiffness Optimization of Composite Wings with Aeroelastic Constraints. Journal of Aircraft, 50 (4), pp. 1159-1168. American Institute of Aeronautics and Astronautics (AIAA). DOI: 10.2514/1.C032084 ISSN 0021-8669

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Official URL: http://arc.aiaa.org/doi/abs/10.2514/1.C032084

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 the mass, strength, buckling, aerodynamic twist, and aileron effectiveness. The elements of the in-plane 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, in which single or multimodal objective functions were minimized. The first numerical results for a generic wing confirmed a functional setup for multiload case stiffness optimizations with aeroelastic design responses. Stiffness-optimized unbalanced laminates demonstrated a clear advantage over balanced laminates for mass or aileron effectiveness optimizations, with constraints on strength and buckling.

Item URL in elib:https://elib.dlr.de/84219/
Document Type:Article
Title:Stiffness Optimization of Composite Wings with Aeroelastic Constraints
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dillinger, Johannesjohannes.dillinger (at) dlr.deUNSPECIFIED
Klimmek, Thomasthomas.klimmek (at) dlr.deUNSPECIFIED
Abdalla, M.M.Aerospace Structures, Delft University of TechnologyUNSPECIFIED
Gürdal, Z.Aerospace Structures, Delft University of TechnologyUNSPECIFIED
Date:July 2013
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:50
DOI :10.2514/1.C032084
Page Range:pp. 1159-1168
Editors:
EditorsEmail
Livne, EliUniversity of Washington
Eastep, Franklin E.Wright-Patterson Air Force Base
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0021-8669
Status:Published
Keywords:stiffness optimization; composite; aeroelastic
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 - Structures & Materials (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Dillinger, Johannes
Deposited On:25 Sep 2013 11:18
Last Modified:08 Mar 2018 18:41

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