A variable stiffness strut using strain induced bending for vibration suppression in the evolutionary model

Pokines, Brett J.; Belvin, W. Keith; Inman, Daniel J.

doi:10.2514/6.1992-2464

Cited by 1 publication

(1 citation statement)

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“…As the amplification ratio increases, lever stiffness decreases reducing efficiency; useful work is eliminated when elastic energy storage equals the input work from the piezoceramic material. Amplification ratios of 13 have been experimentally achieved in piezoceramic systems [33].…”

Section: Strain Microamplifier Operationmentioning

confidence: 99%

A smart material microamplification mechanism fabricated using LIGA

Pokines¹,

Garcia²

1998

Smart Mater. Struct.

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A unique microamplification mechanism formed through the merging of smart material and microelectromechanical system concepts is presented. This microamplification device increases the useful actuation stroke of piezoceramic material through the amplification of piezoceramic strain. The technology demonstrated has utility as a microactuation mechanism for driving micropiezomotors, hearing aid transducers and precision optical switches. The microamplifier, approximately 2000 µm × 200 µm × 800 µm, is composed of electroplated nickel and was constructed using LIGA. An overview of microactuator system requirements and the advantages of scaling the flexure based amplifier illustrates the utility of the new device. The microamplifier is a radically scaled version of a mesoscopic mechanism. An analytical discussion of the operation is presented along with a finite-element analysis of the static and dynamic properties of the microlever. The analytical study is used to develop the operation principles and expected performance of the microamplifier. Experimental static and dynamic testing results are presented that confirm the analytical study. The mechanism has a mean amplification ratio of 5.48, an elastic stroke range of 8 µm and a fundamental frequency of 82 kHz.

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Section: Strain Microamplifier Operationmentioning

confidence: 99%