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research-article

STIFFNESS DESIGN OF CIRCULAR-AXIS HINGE, SELF-SIMILAR MECHANISM WITH LARGE OUT-OF-PLANE MOTION

[+] Author and Article Information
Nicolae Lobontiu

3310 UAA Drive Anchorage, AK 99503 nlobontiu@uaa.alaska.edu

Taylor Gress

3310 UAA Drive Anchorage, AK 99503 tjgress020@gmail.com

Mircea Gh. Munteanu

Udine Udine, Italy Unknown Italy mgh.munteanu@gmail.com

B. Robert Ilic

100 Bureau Drive Gaithersburg, MD 20899 robert.ilic@nist.gov

1Corresponding author.

Contributed by Mechanisms and Robotics Committee of ASME for publication in the Journal of Mechanical Design. Manuscript received October 12, 2018; final manuscript received January 9, 2019; published online xx xx, xxxx. Assoc. Editor: Massimo Callegari.

ASME doi:10.1115/1.4042792 History: Received October 12, 2018; Accepted January 11, 2019

Abstract

This research proposes using the fractal concept to the design of flexible mechanisms by studying the out-of-plane, piston motion of a fractal-configuration device. Multiple flexible, circular and concentric segments are serially connected in a folded architecture to form a compact mechanism that is capable of producing large displacements by summing the small deformations of its units. A simple analytical model is derived, which predicts the mechanism piston compliance/stiffness in terms of configuration, geometry, and material parameters. Experimental testing of a prototype and finite element simulation confirm the mathematical model validity. Several particular designs resulting from the generic architecture are further characterized based on the analytical model to highlight the mechanism stiffness performance and the way it scales with its defining parameters.

Copyright © 2019 by ASME
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