&lt;title&gt;Optimization of unsymmetric actuators for maximum panel deflection control&lt;/title&gt;

Leeks, Tamara J.; Weisshaar, Terrence A.

doi:10.1117/12.208300

Cited by 7 publications

(4 citation statements)

References 2 publications

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“…Piezoelectric actuators create forces proportional to an electrical stimulus. Integrated piezoelectric actuators for structural control have been used in various applications such as vibration control (Crawley and Lazarus 1991), space structures (Bailey and Hubbard 1985), active flight control for fixed wing aircraft (Lin andCrawley 1995, Leeks andWeisshaar 1995) and rotorcraft (Ben-Zeev and Chopra 1995) and actuators for synthetic jets for flow control and electronics cooling (Glezer and Amitay 2002). MFC piezoelectric actuators (Wilkie et al 2000) are piezoelectric composite actuators (Bent and Hagood 1993) with piezoceramic fibers embedded in a dielectric matrix and interdigitated electrodes packaged between layers of polyimide film.…”

Section: Approachmentioning

confidence: 99%

Characterization of hydrofoil damping due to fluid–structure interaction using piezocomposite actuators

Seeley¹,

Coutu²,

Monette³

et al. 2012

Smart Mater. Struct.

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Hydroelectric power generation is an important non-fossil fuel power source to help meet the world’s energy needs. Fluid–structure interaction (FSI), in the form of mass loading and damping, governs the dynamic response of water turbines, such as Francis turbines. Although the effects of fluid mass loading are well documented, fluid damping is also a critical quantity that may limit vibration amplitudes during service, and therefore help to avoid premature failure of the turbines. However, fluid damping has received less attention in the literature. This paper presents an experimental investigation of damping due to FSI. Three hydrofoils were designed and built to investigate damping due to FSI. Piezoelectric actuation using macrofiber composites (MFCs) provided excitation to the hydrofoil test structure, independent of the flow conditions, to overcome the noisy environment. Natural frequency and damping estimates were experimentally obtained from sine sweep frequency response functions measured with a laser vibrometer through a window in the test section. The results indicate that, although the natural frequencies were not substantially affected by the flow, the damping ratios were observed to increase in a linear manner with respect to flow velocity.

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Section: Approachmentioning

confidence: 99%

Characterization of hydrofoil damping due to fluid–structure interaction using piezocomposite actuators

Seeley¹,

Coutu²,

Monette³

et al. 2012

Smart Mater. Struct.

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show abstract

“…Optimal thickness of PZT actuators has also been investigated with respect to the static deflection of the substrate. Experimental results have been presented on static deflection induced by rectangular PZT actuators bonded on a rectangular plate (Leeks and Weisshaar, 1995). These results show the existence of an optimal ratio of actuator thickness over substrate thickness and an optimal ratio of actuator area over substrate area, but they are limited to static deflection cases.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Thickness of Piezoceramic Actuators for Bending Vibration of Planar Structures

Delas

Berry

Masson

et al. 2007

Journal of Intelligent Material Systems and Structures

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An analytical approach is proposed to optimize the thickness of piezoceramic (PZT) actuators bonded on structures for active shape, noise, or vibration control. The optimal thickness corresponds to maximal mechanical coupling between the PZT actuator and the substrate. The analysis is carried out for a planar geometry, considering a square simply supported flexural plate with a square and a centered PZT actuator bonded either in symmetric or asymmetric configuration. Optimal thicknesses obtained from explicit analytical expressions are compared with finite element (FE) results for various substrate thicknesses and for various values of actuator coverage ratio. Static and dynamic strain profiles through the thickness of the plate—actuator system are plotted. Laboratory experiments are carried out on aluminum and steel plates with free and clamped boundary conditions to verify the analytical and FE predictions in terms of optimal PZT actuator thickness.

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“…Charette et al (1994) demonstrated the actuation and sensing in an asymmetric piezoelectric beam using two separate transducers. Leeks and Weisshaar (1995) showed the optimization of the thickness and distribution of the piezoelectric material in an asymmetric thin plate. and presented models of asymmetric actuators with bendingextension and bending-torsion coupling.…”

Section: Introductionmentioning

confidence: 99%

The actuation characterization of cantilevered unimorph beams with single crystal piezoelectric materials

Bilgen

Karami

Inman

et al. 2011

Smart Mater. Struct.

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An experimental and theoretical electromechanical characterization of beam-like, uniform cross-section, unimorph structures employing single crystal piezoelectrics is presented. The purpose of the research is to understand and compare the actuation capabilities of several piezoelectric materials and substrate configurations so that optimal design choices can be employed in lightweight, low power aerodynamic applications. Monolithic devices made from three kinds of piezoelectrics-single crystal PMN-PZT (lead magnesium niobate-lead zirconate titanate) and the polycrystalline PZT-5A and PZT-5H types-are compared in a unimorph cantilevered beam configuration. A total of 24 unimorph specimens are fabricated and the validity of existing models is examined through experimentation. The tip velocity response to harmonic voltage excitation is measured and compared to the analytical prediction with the perfect bonding assumption. Summarizing, it was confirmed that the substrate-to-piezoelectric thickness ratio and substrate modulus are the important design parameters in determining the measured output of the unimorphs and the accuracy of the model prediction. The single crystal piezoelectrics demonstrated actuation authority two to four times higher (measured in terms of peak displacement per applied voltage) when compared to the polycrystalline piezoceramics for the same substrate material and geometry choice. In contrast to the higher actuation output, practical implementation issues are noted for the single crystal devices. The lack of grain boundaries (as in the polycrystalline material) makes the single crystals very 'brittle' and susceptible to stress concentrations. Another important limitation is the low transition temperature, which limits the use of conventional solder materials in creating electrical connections.

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<title>Optimization of unsymmetric actuators for maximum panel deflection control</title>

Cited by 7 publications

References 2 publications

Characterization of hydrofoil damping due to fluid–structure interaction using piezocomposite actuators

Characterization of hydrofoil damping due to fluid–structure interaction using piezocomposite actuators

Optimizing the Thickness of Piezoceramic Actuators for Bending Vibration of Planar Structures

The actuation characterization of cantilevered unimorph beams with single crystal piezoelectric materials

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