Point-actuated aperture antenna development

Angelino, Marc; Washington, Gregory

doi:10.1117/12.436594

Cited by 8 publications

(5 citation statements)

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“…Recent studies (Washington, 1996;Yoon and Washington, 1998;Martin et al, 2000;Angelino and Washington, 2001) have shown that antenna reflector adaptation can potentially enhance system performance and increase flexibility, such as changing the signal pattern or coverage area. In this example, a flexible antenna reflector changes its shape to direct the radiation signal to a different direction.…”

Section: Flexible Antenna Reflectormentioning

confidence: 99%

An Effective Method of Synthesizing Compliant Adaptive Structures using Load Path Representation

Kota

2005

Journal of Intelligent Material Systems and Structures

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The synthesis of shape morphing compliant mechanism is inherently different from the typical single output design problems, due to the multiple output points along the morphing boundary. We have previously developed a genetic algorithm (GA)-based synthesis approach, incorporating a binary ground structure parameterization, to systematically design shape morphing compliant mechanisms. However, the approach is ineffective due to issues such as the generation of disconnected structures and the need to choose an initial mesh. In this paper, we present the ‘load path representation,’ which is developed to overcome the issues encountered using the binary ground structure parameterization. The performance of the load path approach over the binary ground structure approach is demonstrated through several design examples. The results have shown that the load path approach offers several advantages, such as (a) eliminating the need of an initial ground structure, (b) ensuring structural connectivity, and (c) yielding solutions that generate desired shape change efficiently.

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Section: Flexible Antenna Reflectormentioning

confidence: 99%

An Effective Method of Synthesizing Compliant Adaptive Structures using Load Path Representation

Kota

2005

Journal of Intelligent Material Systems and Structures

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“…To respond to varying operating conditions and external disturbances, the component shape has to change adaptively to maintain optimal system performance and enhance versatility. Various adaptive shape change (shape morphing) systems have been developed and incorporated into practical applications (Austin and Van Nostrand, 1995;Washington, 1996;Austin et al, 1997;Martin et al, 1997Martin et al, , 1998Martin et al, , 2000Yoon and Washington, 1998;Webb et al, 1999;Yoon et al, 2000;Ameduri et al, 2001;Angelino and Washington, 2001). Most of these shape morphing systems involve the use of smart actuators and materials, such as shape memory alloys (SMAs) and lead zirconate titanate (PZT).…”

Section: Shape Change Using Compliant Mechanismsmentioning

confidence: 99%

“…Recent studies (Washington, 1996;Martin et al, 1998Martin et al, , 2000Yoon and Washington, 1998;Yoon et al, 2000;Angelino and Washington, 2001) have shown that antenna reflector adaptation can potentially enhance system performance and increase flexibility, such as changing the signal pattern or coverage area. Two examples similar to the ones shown in Washington (1996) are presented in this section to illustrate the synthesis approach described in this paper and demonstrate the feasibility of shape change using compliant mechanisms.…”

Section: Design Examplesmentioning

confidence: 99%

Design of Compliant Mechanisms for Morphing Structural Shapes

Kota

2003

Journal of Intelligent Material Systems and Structures

136

100

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Various compliant mechanism synthesis methods have been developed over the past decade; however, very little attention has been directed towards adaptive shape change problems. In this paper, we present a systematic method for synthesizing compliant mechanisms to morph a given curve or profile into a target curve utilizing minimum number of actuators (typically one). Two objective functions are formulated, using Least Square Errors and a modified Fourier Transformation, to capture the shape differences. The topology and dimensions of the optimal compliant mechanism are generated using Genetic Algorithms. Applications of this synthesis approach are demonstrated through two adaptive antenna design examples.

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“…For ground based systems active optics were developed to alleviate those effects or even to make use of the flexibility of less massive mirrors [1]. Adaptive optics, using secondary deformable mirrors to correct the wavefront distorted from atmospheric and local turbulence, have become an indispensable tool to bring large optical instruments close to their theoretical capabilities [2][3][4][5][6][7][8]. Furthermore, enhancing resolution by interferometric coupling of separate mirrors has been proven to be a viable tool, as, e.g., with the very large telescope interferometer [9], the Keck interferometer [10] and the large binocular telescope [11].…”

Section: Introductionmentioning

confidence: 99%

“…Due to transportation limitations large optical telescopes in space require lighter primary mirrors than the existing ones and new concepts such as deployable systems (JWST) or even membrane mirrors [8,[23][24][25][26][27]. Structures will become more 'floppy', thus active or adaptive measures are inevitable for diffraction limited operation and high accuracy pointing.…”

Section: Introductionmentioning

confidence: 99%

Development and manufacture of an adaptive lightweight mirror for space application

Dürr

Honke

Alberti³

et al. 2003

Smart Mater. Struct.

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Currently, scientific space missions based on interferometric optical and infrared astronomical instruments are under development in the United States as well as in Europe. These instruments require optical path length accuracy in the order of a few nanometres across structural dimensions of several metres. This puts extreme demands on static and dynamic structural stability. It is expected that actively controlled, adaptive structures will increasingly have to be used for these satellite applications to overcome the limits of passive structural accuracy. Based on the evaluation of different piezo-active concepts, analysis and design of an adaptive lightweight satellite mirror primarily made of carbon fibre reinforced plastic with embedded piezoceramic actuators for shape control is described. Simulation of global mirror performance takes different wavefront sensors and controls for several cases of loading into account. Extensive finite-element optimization of various structural details was performed while testing of active sub-components served as a basis for a final update of finite-element models. Local material properties of sub-assemblies or geometry effects at the edges of the structure were investigated with respect to their impact on mirror performance. The major result of the analysis was the lay-out of the adaptive mirror and the specific design of embedded piezoceramic actuators. Manufacture of structural components and successfully completed mirror integration is described. The paper concludes with an outline of testing, and space qualification of the demonstrator of an actively controllable lightweight satellite mirror currently under way.

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Point-actuated aperture antenna development

Cited by 8 publications

References 0 publications

An Effective Method of Synthesizing Compliant Adaptive Structures using Load Path Representation

An Effective Method of Synthesizing Compliant Adaptive Structures using Load Path Representation

Design of Compliant Mechanisms for Morphing Structural Shapes

Development and manufacture of an adaptive lightweight mirror for space application

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