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Effective lightweight design of a rocket interstage ring through mixed-integer optimization

Köke, Hardy and Weiß, Lennart and Hühne, Christian (2013) Effective lightweight design of a rocket interstage ring through mixed-integer optimization. In: Research and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013. CRC Press. SEMC 2013: THE FIFTH INTERNATIONAL CONFERENCE ON STRUCTURAL ENGINEERING, MECHANICS AND COMPUTATION, 02.-04. Sep. 2013, Capetown, South Africa. ISBN 978-113800061-2

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Abstract

The full lightweight potential of carbon fiber reinforced plastics in complex structures can only be exploited using an adequate combination of material and design. Potential combinations can be found, using an optimization routine integrated into the design process. This paper presents a detailed comparison of the optimization results for distinctive rocket interstage design concepts. The complex cylindrical grid structure has to withstand the mission loads while being as light as possible. For the efficient use of the superior material properties, carbon fiber reinforced plastics are combined with a foam core to form a sandwich configuration. To minimize the total mass, parametric finite element models are used within a constrained, mixed-integer optimization. The structure is modeled using a bottom up strategy. An optimization framework, incorporating the CAE software Ansys into the multi-purpose optimization package pyOpt, is presented. The augmented lagrangian particle swarm algorithm is used to find the configurations having minimal weight. As manufacturability is an important design requirement, a winding process is represented by constraints in the parameter set of the geometry. The stiffnesses of the structure, as well as strength criteria of the laminate are used as inequality constraints for the optimization. Further on, a lower bound of the first natural eigenfrequency using additional constraints, is investigated. Finally, the impact of the governing geometry, material parameters and hence their influences on the optimization problem are carefully reviewed. It is shown that appropriate design – material combinations can significantly reduce the structural mass.

Item URL in elib:https://elib.dlr.de/96617/
Document Type:Conference or Workshop Item (Speech)
Title:Effective lightweight design of a rocket interstage ring through mixed-integer optimization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Köke, Hardyhardy.koeke (at) dlr.deUNSPECIFIED
Weiß, Lennartlennart.weiss (at) dlr.deUNSPECIFIED
Hühne, Christianchristian.huehne (at) dlr.deUNSPECIFIED
Date:2 September 2013
Journal or Publication Title:Research and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Zingoni, AlphoseDepartment of Civil Engineering, University of Capetown, Cape Town, South Africa
Publisher:CRC Press
ISBN:978-113800061-2
Status:Published
Keywords:Spacecraft, Composite, Optimization
Event Title:SEMC 2013: THE FIFTH INTERNATIONAL CONFERENCE ON STRUCTURAL ENGINEERING, MECHANICS AND COMPUTATION
Event Location:Capetown, South Africa
Event Type:international Conference
Event Dates:02.-04. Sep. 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Landetechnologien
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Functional Lightweight Structures
Deposited By: Weiß, Lennart
Deposited On:21 Jul 2015 14:48
Last Modified:27 Sep 2017 07:30

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