Development of bi-stable and millimeter-scale displacement actuator using snap-through effect for reciprocating control fins

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A new two-step amplifying mechanism combining a lever-arm with flexure hinges and a pre-curved thin shell structure is proposed to make a millimeter-scale linear actuator. A large amplification ratio can be obtained by the snap-through effect of a post-buckled shell structure without losing actuation force. The snap-through phenomenon of pre-curved thin-plate are numerically analyzed by using the finite-element software ABAQUS to specify the trigger force and displacement required to initiate the snap-through. The analytic results are in good agreement with the test results for the pre-curved shell structure. The trigger force and displacement for snap-through are supplied by the lever-arm with the piezo stack actuator. Amplification ratio of the lever-arm is drastically changed according to the external load. The lever-arm mechanism is designed to have enough actuation force and displacement to satisfy requirements such as trigger force and displacement of the bi-stable structure. The components of the designed actuators are manufactured and integrated. The designed two-step amplified actuator is experimentally validated to operate with an 8 mm stroke and 2 Hz bandwidth. (C) 2013 Elsevier Masson SAS. All rights reserved.
Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Issue Date
2014-01
Language
English
Article Type
Article
Citation

AEROSPACE SCIENCE AND TECHNOLOGY, v.32, no.1, pp.131 - 141

ISSN
1270-9638
DOI
10.1016/j.ast.2013.11.007
URI
http://hdl.handle.net/10203/187203
Appears in Collection
AE-Journal Papers(저널논문)
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