Identification of Compliant Pseudo-Rigid-Body Four-Link Mechanism Configurations Resulting in Bistable Behavior

[+] Author and Article Information
Brian D. Jensen

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48105

Larry L. Howell

Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602e-mail: l_howell@byu.edu

J. Mech. Des 125(4), 701-708 (Jan 22, 2004) (8 pages) doi:10.1115/1.1625399 History: Received May 01, 2000; Revised April 01, 2003; Online January 22, 2004
Copyright © 2003 by ASME
Topics: Springs , Mechanisms , Design
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The concept of the pseudo-rigid-body model. Compliant segments are modeled as rigid segments joined by pin joints, with torsional springs at the joints.
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A four-link mechanism with a torsional spring at each joint
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The two different positions of a four-link mechanism for a given angle θ4
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The two kinematic chains which form a four-link mechanism
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A bistable four-link mechanism showing the two stable positions and one unstable position (a), and a compliant equivalent (b)
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A rigid-body four-link mechanism that meets the design requirements
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Layout for a fully-compliant bistable switch as-fabricated (a) and closed (b)
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A model of the four-link mechanism class chosen for the bistable micro-mechanism
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Four possible mechanism configurations for bistable micro-mechanisms. (a) is Grashof, and (b), (c), and (d) are non-Grashof.
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An example of a bistable compliant micro-mechanism whose pseudo-rigid-body model is a non-Grashof four-link mechanism. (a) shows the mechanism and its pseudo-rigid-body model, and (b) shows the two stable positions.




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