Distributed Sensing and Shape Control of Piezoelectric Bimorph Mirrors

Redmond, James M.; Barney, P.; Henson, Tammy D.

doi:10.1177/104538900772663784

Cited by 6 publications

(6 citation statements)

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“…The new velocity is given as a combination of the current velocity, a velocity change based on the particle's learning, and a velocity change based on the flock's behavior (social learning) as given in Eqn. 6…”

Section: A Design Synthesis Methods Using Particlementioning

confidence: 99%

“…Many different mechanisms could potentially generate such a shape change. Quite a few morphing wing designs utilize smart actuators and materials, such as lightweight piezocomposite and shape memory alloys [6,7]. However, most of those mechanisms are neither able to cause large scale effects, nor cost efficient [8].…”

Section: Figure 1 Relation Between Airfoil Geometry and Performancementioning

confidence: 99%

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An Automated Design Synthesis Method for Compliant Mechanisms With Application to Morphing Wings

Wang

Rosen

2006

Volume 2: 30th Annual Mechanisms and Robotics Conference, Parts a and B

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An automated design synthesis method is developed to design an airfoil with a reconfigurable shape, which can change from one type of geometry to another. A design synthesis method using unit truss approach and particle swarm optimization is presented. In the unit truss approach, unit truss is used as a new unit cell for mechanics analysis of cellular structures, including lightweight structures and compliant mechanisms. Using unit truss approach, axial forces, bending, torsion, nonlinearity, and buckling in structures can be considered. It provides good analysis accuracy and computational efficiency. A synthesis method using unit truss approach integrated with particle swarm optimization is developed to systematically design adaptive cellular structures, in particular, compliant mechanisms discussed in this paper. As an example study, the authors realize the design synthesis of a compliant mechanism that enables an entire closed-loop airfoil profile to change shape from NACA 23015 to FX60-126 for the desired morphing wing. The nonlinear behavior of compliant mechanisms under large deformation is considered. The resulting design is validated by testing its robustness and considering nonlinearity.

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Section: A Design Synthesis Methods Using Particlementioning

confidence: 99%

Section: Figure 1 Relation Between Airfoil Geometry and Performancementioning

confidence: 99%

An Automated Design Synthesis Method for Compliant Mechanisms With Application to Morphing Wings

Wang

Rosen

2006

Volume 2: 30th Annual Mechanisms and Robotics Conference, Parts a and B

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“…It has exhibit pyroelectric and piezoelectric properties. PVDF and its blends (with one or more other polymers) have received great attentions for the advanced applications . For enhanced performances and expanded applications of PVDF, the fillers or nanofillers are doped .…”

Section: Introductionmentioning

confidence: 99%

Thermal and electrical properties of graphene incorporated into polyvinylidene fluoride/polymethyl methacrylate nanocomposites

Alhusaiki-Alghamdi

2016

Polymer Composites

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Polymer blend based on polyvinylidene fluoride (PVDF)/polymethyl methacrylate (PMMA) and the blend incorporated with low content ( £ 0.08) of graphene (GN) oxide were prepared. The characteristic bands for PVDF and PMMA were detected in Raman and IR spectroscopy. There are shifts in Raman and IR spectra due to interaction between the polymer and the blend with OH and C5O in GN oxide. The TGA thermograms show main weight loss in temperature range from 3218C to 4818C attributed to thermal decompositions of polymeric chain. The thermal decomposition was shifted toward higher temperature than that the blend confirms enhancement of thermal stability of the films. The AC electrical conductivity and kinetic parameters were measured at different temperature frequencies. The addition of GN increases the conductivity. The values of e 00 are high at low frequencies and it is decrease with increase frequencies due to polarization effects or to the dipoles not begin to follow the field variation at higher frequencies. The increase in tan d with increase in GN oxide content due to interfacial polarization mechanism occurred in the films corresponding to frequencies. All results data indicate that the nanocomposites contain GN were enhanced.

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“…We described previously the issues of materials selection7, 8 and the systematic study of the effects of temperature9 and AO/vacuum UV‐radiation10 on piezoelectric vinylidene fluoride‐based polymers being evaluated for use in novel thin‐film adaptive optics 11. Two promising piezoelectric polymers, PVDF and P(VDF‐TrFE), were chosen from a range of potential candidate materials and it was shown that the reorientation of the dipoles due to thermal contraction and dipole randomization had a large contribution to depoling and hence the loss of piezoelectric properties.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of piezoelectric PVDF polymers for use in space environments. III. Comparison of the effects of vacuum UV and gamma radiation

Dargaville

Elliott

Celina

2006

J Polym Sci B Polym Phys

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Films of piezoelectric PVDF and P(VDF-TrFE) were exposed to vacuum UV (115-300 nm VUV) and c-radiation to investigate how these two forms of radiation affect the chemical, morphological, and piezoelectric properties of the polymers. The extent of crosslinking was almost identical in both polymers after c-irradiation, but surprisingly, was significantly higher for the TrFE copolymer after VUV-irradiation. Changes in the melting behavior were also more significant in the TrFE copolymer after VUV-irradiation due to both surface and bulk crosslinking, compared with only surface crosslinking for the PVDF films. The piezoelectric properties (measured using d 33 piezoelectric coefficients and D-E hysteresis loops) were unchanged in the PVDF homopolymer, while the TrFE copolymer exhibited more narrow D-E loops after exposure to either cor VUV-radiation. The more severe damage to the TrFE copolymer in comparison with the PVDF homopolymer after VUV-irradiation is explained by different energy deposition characteristics. The short wavelength, highly energetic photons are undoubtedly absorbed in the surface layers of both polymers, and we propose that while the longer wavelength components of the VUV-radiation are absorbed by the bulk of the TrFE copolymer causing crosslinking, they are transmitted harmlessly in the PVDF homopolymer.

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Distributed Sensing and Shape Control of Piezoelectric Bimorph Mirrors

Cited by 6 publications

References 0 publications

An Automated Design Synthesis Method for Compliant Mechanisms With Application to Morphing Wings

An Automated Design Synthesis Method for Compliant Mechanisms With Application to Morphing Wings

Thermal and electrical properties of graphene incorporated into polyvinylidene fluoride/polymethyl methacrylate nanocomposites

Evaluation of piezoelectric PVDF polymers for use in space environments. III. Comparison of the effects of vacuum UV and gamma radiation

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