Noncontact Electron Gun Actuation of a Piezoelectric Polymer Thin Film Bimorph Structure

Martin, Jeffrey W.; Main, John A.

doi:10.1177/104538902761696689

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…Analyzing a similar geometry, Lee et al 15 calculated influence functions for each actuator as an individual phenomena where each actuated area was mathematically treated as a separate domain with clamped boundary conditions, and fitted with an Euler-Bernoulli beam model with a correction factor. Martin et al 16,17 modelled non-tensioned mirrors as well, but introduced the significant enabling technology of a non-contact electron gun to control the voltage applied to the piezoelectric actuators.…”

Section: Review Of Modelling Effortsmentioning

confidence: 99%

Low-order actuator influence functions for piezoelectric in-plane actuated tensioned circular deformable mirrors

Shepherd¹,

Cobb²,

Baker³

2006

Smart Structures and Materials 2006: Modeling, Signal Processing, and Control

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Future space-based optical reflectors will be driven by the desire for large apertures versus the constraints of low weight and compactness of packaging. One possible way to satisfy these competing factors is through the use of piezoelectric in-plane actuated, tensioned, deformable mirrors. These configurations typically exhibit both plate-like and membrane-like behavior. Proposed is a new approximation method for the solution to this class of mirror, where the normalized plate stiffness to tension ratio is small. The approximation function is based on the exact analytical solution to this class of problems. The approximation method allows the problem to be reduced to a simple pressure forced membrane equation, a geometry which may be more readily analyzed. A case study comparing the results of the approximation method to a high fidelity finite element model constructed in MSC.Nastran is provided.

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Section: Review Of Modelling Effortsmentioning

confidence: 99%

Low-order actuator influence functions for piezoelectric in-plane actuated tensioned circular deformable mirrors

Shepherd¹,

Cobb²,

Baker³

2006

Smart Structures and Materials 2006: Modeling, Signal Processing, and Control

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“…The voltage or electric field for controlling the shape of the thin mirror will be applied with an electron gun that deposits electrons on the mirror's electrode segments. Previous work by Henson et al (2001) and Martin et al (2001) have shown the feasibility of this electron-gun-actuation concept and the success in using it to control quasi-static tip displacement of cantilever beams. Similar experiments were performed in this work to characterize the dynamics of PVDF bimorph under electron gun excitation.…”

Section: Experimental Actuation With Electron Gunmentioning

confidence: 99%

Shape Control of a Flexible Mirror Using an Electron Gun

Sumali

Martin

Chaplya

et al. 2003

Dynamic Systems and Control, Volumes 1 and 2

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Mirrors made of PVDF film are being considered for lightweight transportation and deployment in space. An array of electrodes can be used to distribute charges over the PVDF film for active shaping of the mirrors. This paper presents the derivation of a matrix that enables calculation of the shape of the two-dimensional mirror for any given electron distribution. Finite element simulation shows good agreement with a theoretical example. Furthermore, if a desired shape is given, the required voltage distribution can be computed using the singular value decomposition. Experiments were done in a vacuum vessel, where an electron gun was used to actuate a PVDF bimorph to a desired shape. Dynamic shape control is attainable at low frequencies. At higher frequencies, still significantly below structural resonance, actuation lag and parasitic DC offset can be significant problems that require future research to solve.

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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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Noncontact Electron Gun Actuation of a Piezoelectric Polymer Thin Film Bimorph Structure

Cited by 10 publications

References 25 publications

Low-order actuator influence functions for piezoelectric in-plane actuated tensioned circular deformable mirrors

Low-order actuator influence functions for piezoelectric in-plane actuated tensioned circular deformable mirrors

Shape Control of a Flexible Mirror Using an Electron Gun

Design of patterned multilayer films with eigenstrains by topology optimization

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