Distributed Sensing and Shape Control of Piezoelectric Bimorph Mirrors

Martin, Jeffrey W.; Redmond, James M.; Barney, P.; Henson, Tammy D.; Wehlburg, Joseph C.; Main, John A.

doi:10.1106/2ulx-mnqh-y1af-8b5v

Cited by 26 publications

(7 citation statements)

References 16 publications

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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%

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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Section: Shape Change Using Compliant Mechanismsmentioning

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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“…Examples include plate and shell structures with patches of active materials such as shape memory alloys or piezoelectric ceramics (Wang et al, 1997;Lin and Ren, 1998;Wang and Wang, 2000;Quek et al, 2003;Aldraihem and Khdeir, 2003), piezoelectric thin film mirrors that can be actively shaped using electric fields applied by an electron flux at selected locations (Martin et al, 2000;Martin and Main, 2002), and the post-cured shape of laminated composites (Hyer, 1981). Although these applications do not lie within the scope of this work, the approach that is developed can be readily applied to these and many other related problems.…”

Section: Introductionmentioning

confidence: 99%

Design of patterned multilayer films with eigenstrains by topology optimization

Pajot

Maute

Zhang

et al. 2006

International Journal of Solids and Structures

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We develop a formal approach to design shaped microstructures from multilayer films with eigenstrains in the layers. The eigenstrains are inelastic strains that vary from layer to layer resulting in elastic misfit between the layers. Examples include thermal expansion mismatch between the layers, piezoelectric strains, and strains in shape memory alloys. In our approach, the eigenstrains are manipulated by spatially patterning the films to generate structures that, although fabricated by a conventional, planar thin film technology, deform into desired three-dimensional shaped surfaces. The material patterns in the individual layers are determined by topology optimization allowing the creation of arbitrarily complex, geometric layouts. In contrast to existing topology optimization methods for patterning plate structures, the goal of the proposed approach is to generate large deformations via eigenstrains, rather than to increase the stiffness of plate via reinforcement patterns. The optimization methodology is demonstrated by the design of two-and three-layer thin film structures. The performance of the optimized designs is verified by experiments showing the importance of accounting for a nonlinear kinematics in order to obtain the desired shape in the deformed configuration. While our approach is demonstrated in the context of the design of three-dimensional microstructures, it can be easily applied to a variety of problems where it is desired to control the complex shape of plate-like structures by spatial actuation-the spatial actuators are represented by eigenstrains.

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“…Here, it was shown that the addition of thin PVDF patches did not significantly alter the modal characteristics of the inflated host structure. Reference [8] investigated a noncontact distributed actuation methodology of PVDF films using a steerable electron beam. Furthermore, [1] explored the performance of electron-beam-actuated electroactive polymers (EAP) for global shape control of the W error.…”

Section: Introductionmentioning

confidence: 99%

Optimized Gore/Seam Cable Actuated Shape Control of Gossamer Membrane Reflectors

DeSmidt

Wang

Fang

2007

Journal of Spacecraft and Rockets

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This investigation explores the feasibility of using an active gore/seam cable-based control system to reduce global root mean square figure errors due to thermal loading and inflation effects (W error) in large, gossamer, inflatable membrane reflectors. Analysis is performed on an inflated spherical membrane with polyvinylidene-fluorideactuated radial cables, for which the cable lengths and attachment points are designed via genetic algorithm optimization. It is found that through proper tailoring of the cable lengths, significant global root mean square figureerror reduction is achieved. Specifically, root mean square errors due to on-orbit thermal loading were reduced by approximately 75% with a 104-cable active gore/seam cable-control system that has a mass equal to 15% the original reflector. Similarly, W errors were reduced by approximately 95% with a 104-gore/seam cable-control system with a mass ratio of 12%. Finally, to deal with simultaneous W error and thermal loading with uncertain relative magnitudes, a hybrid gore/seam cable-control configuration based on a combination of independently optimized thermal and W-error cable patterns is considered. By adjusting the weights of a hybrid objective function, the gore/ seam cable-control system demonstrated robust shape-control performance for combined loading conditions. Because of the relatively lightweight designs and shape-control effectiveness, the gore/seam cable-shape-control concept seems promising for future gossamer reflector applications.

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Distributed Sensing and Shape Control of Piezoelectric Bimorph Mirrors

Cited by 26 publications

References 16 publications

Design of Compliant Mechanisms for Morphing Structural Shapes

Design of Compliant Mechanisms for Morphing Structural Shapes

Design of patterned multilayer films with eigenstrains by topology optimization

Optimized Gore/Seam Cable Actuated Shape Control of Gossamer Membrane Reflectors

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