Recurve piezoelectric-strain-amplifying actuator architecture

Ervin, James D.; Brei, Diann

doi:10.1109/3516.736163

Cited by 59 publications

(41 citation statements)

References 13 publications

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“…In order to address those problems, the valve design incorporated the thermo-mechanical bimorph into the 'recurve' actuator configuration of Ervin and Brei (1998) for piezoelectiic polymers, as shown in Figure 42. While the deflection at the midpoint of the recurve element is less than for a simple cantilever of the same length, the combination of two bimorphs opposing each other produces a parallel displacement of the endpoint relative to the base.…”

Section: Valve Designmentioning

confidence: 99%

Mixing and Combustion in Vortex Dominated Combustors with Distributed Air- and Fuel-Injection

Acharya¹,

Murphy²

1998

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Section: Valve Designmentioning

confidence: 99%

Mixing and Combustion in Vortex Dominated Combustors with Distributed Air- and Fuel-Injection

Acharya¹,

Murphy²

1998

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“…1 Numerous studies have been centered on the addition of various types of mechanisms, the use of different lamination techniques and/or shapes to amplify either deflection at the expense of force or force at the expense of deflection. [2][3][4][5][6][7] In each case some finite amount of total work was lost in the conversion process while weight, volume, complexity and cost penalties were incurred. Because many classes of aircraft have extremely tight weight, volume and performance requirements, they tend to drive actuators to smaller packages with higher levels of performance.…”

Section: Introductionmentioning

confidence: 99%

Post-buckled precompressed (PBP) elements: a new class of flight control actuators enhancing high-speed autonomous VTOL MAVs

et al. 2005

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This paper describes a new class of flight control actuators using Post-Buckled Precompressed (PBP) piezoelectric elements. These actuators are designed to produce significantly higher deflection and force levels than conventional piezoelectric actuator elements. Classical laminate plate theory (CLPT) models are shown to work very well in capturing the behavior of the free, unloaded elements. A new high transverse deflection model which employs nonlinear structural relations is shown to successfully predict the performance of the PBP actuators as they are exposed to higher and higher levels of axial force, which induces post buckling deflections. A proof-of-concept empennage assembly and actuator were fabricated using the principles of PBP actuation. A single grid-fin flight control effector was driven by a 3.5" (88.9mm) long piezoceramic bimorph PBP actuator. By using the PBP configuration, deflections were controllably magnified 4.5 times with excellent correlation between theory and experiment. Quasi-static bench testing showed deflection levels in excess of ±6° at rates exceeding 15 Hz. The new solid state PBP actuator was shown to reduce the part count with respect to conventional servoactuators by an order of magnitude. Power consumption dropped from 24W to 100mW, weight was cut from 108g to 14g, slop went from 1.6° to 0.02° and current draw went from 5A to 1.4mA. The result was that the XQ-138 subscale UAV family experienced nearly a 4% reduction in operating empty weight via the switch from conventional to PBP actuators while in every other measure, gross performance was significantly enhanced.

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“…Recent applications in smart structures and materials are limited by the manufacture of composites with a thermosetting matrix [2] such as: shape control of airplane wings [3], car bodies, reflector antennas [4], deformable mirrors, and actuators such as the so-called bimorph and C-block actuators [5,6], which are widely used in the automation and aeronautics industries.…”

Section: Introductionmentioning

confidence: 99%

Methodology for the manufacture of smart composites with thermoplastic matrix

Elsoufi¹,

Khalil²,

Lachat³

et al. 2007

WIT Transactions on Modelling and Simulation, Vol 46

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The adaptable mechanical structures in the form of Shell have found large developments and use in many applications, especially in the field of smart structures where the piezoelectric components are used as actuators and sensors. Many functional constraints prevent the control of a structure by elements reported on the surfaces of the object. Thus, the piezoelectric components necessary for the control of the structures will be integrated into this, i.e., in material, even the material of the wall. Certain work describes the manner and the performances of structures by using composite materials with thermoset matrices as structural support and piezoelectric components as the actuator or sensor elements. The current difficulties in recycling the thermoset materials are hindering the industrial development of such structures. For this reason, we propose to use composites with a thermoplastic matrix. Unfortunately, the current processes of achieving models in smart thermoplastic structures are not directly exploitable for the integration of components such as the piezoelectric actuators and sensors which are fragile and sensitive to temperature.This work evaluates the sizes typically reached in the process transformations of such composites with a thermoplastic matrix in order to be able to establish the behavior models for the realized structures. A thermo-mechanic testing method using dynamic mechanical analysis (DMA) is also proposed.

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Recurve piezoelectric-strain-amplifying actuator architecture

Cited by 59 publications

References 13 publications

Mixing and Combustion in Vortex Dominated Combustors with Distributed Air- and Fuel-Injection

Mixing and Combustion in Vortex Dominated Combustors with Distributed Air- and Fuel-Injection

Post-buckled precompressed (PBP) elements: a new class of flight control actuators enhancing high-speed autonomous VTOL MAVs

Methodology for the manufacture of smart composites with thermoplastic matrix

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