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Initial thoughts on weight penalty effects in shape-adaptable systems

Campanile, Lucio Flavio (2005) Initial thoughts on weight penalty effects in shape-adaptable systems. Journal of Intelligent Material Systems and Structures, 16 (1), pp. 47-56. SAGE Publications. DOI: 10.1177/1045389X05046692

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If a structural system has to be subjected to high loads and large geometry changes, according to the state of the art, articulated systems with discrete actuators are used, with the articulated systems consisting of stiff members connected by hinges. As an alternative, smart structures technologies can supply solutions based on the deliberate use of structural flexibility and on distributed actuation. In order to assess the advantages, which can be expected from such solutions, a thorough comparison must be made between the properties of compliant mechanisms and the conventional ones. A crucial aspect of this comparison, on which this contribution is focused, is the impact on the system’s structural weight. The first part of the paper deals with the relevance of weight penalty effects in shapeadaptable systems, with a special focus on airfoil shape control. A quantitative analysis of weight penalty effects in pin-jointed articulated structures follows. The criterion on which this analysis is based allows a characterization of general validity, not restricted to a particular example, and can be applied to other mechanisms or hinge architectures, providing a sound way of assessing the lightweight potential of a given concept and allowing a consistent comparison between different design philosophies. An extension to weight penalty effects in compliant systems shows a higher degree of complexity and could not be addressed in the same detail in this study. Anyway, some peculiar aspects are discussed in the final part of the paper, which can serve as a basis for future developments in this sense. In particular, the dependence of weight penalty effects on the system’s range of motion as well as on the loaddependence of the mechanism’s kinematics is addressed. Even if the presented results can be of direct significance to the designer of conventional articulated mechanisms, the primary relevance of this work is to be seen in the long term. Its main target is to provide a basis for the analysis of the potential offered by the compliant mechanisms and smart materials for the realization of light shape-adaptable structures and to give an impulse to research efforts aiming at developing suitable optimization procedures as well as formulating proper design rules for such kind of systems.

Item URL in elib:https://elib.dlr.de/19629/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Initial thoughts on weight penalty effects in shape-adaptable systems
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:January 2005
Journal or Publication Title:Journal of Intelligent Material Systems and Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1177/1045389X05046692
Page Range:pp. 47-56
Publisher:SAGE Publications
Keywords:compliant mechanisms, multidisciplinary design and optimization, shape control, weight penalty, lightweight design
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - no assignment (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems
Deposited By: Wolff, Sibylle
Deposited On:10 Feb 2007
Last Modified:27 Apr 2009 04:42

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