0
Research Papers

Design of a Large-Stroke Bistable Mechanism for the Application in Constant-Force Micropositioning Stage

[+] Author and Article Information
Qingsong Xu

Smart and Micro/Nano Systems Laboratory,
Department of Electromechanical Engineering,
Faculty of Science and Technology,
University of Macau,
Avenida da Universidade,
Taipa, Macau, China
e-mail: QSXu@umac.mo

Manuscript received May 1, 2016; final manuscript received November 3, 2016; published online December 2, 2016. Assoc. Editor: Hai-Jun Su.

J. Mechanisms Robotics 9(1), 011006 (Dec 02, 2016) (7 pages) Paper No: JMR-16-1125; doi: 10.1115/1.4035220 History: Received May 01, 2016; Revised November 03, 2016

To overcome the constraint of conventional tilted beam-based bistable mechanism, this paper proposes a novel type of bistable structure based on tilted-angle compound parallelogram flexure to achieve a larger stroke of negative stiffness region while maintaining a compact physical size. As an application of the presented bistable mechanism, a flexure constant-force micropositioning stage is designed to deliver a large stroke. The constant force output is obtained by combining a bistable flexure mechanism with a positive-stiffness flexure mechanism. To facilitate the parametric design of the flexure mechanism, analytical models are derived to quantify the stage performance. The models are verified by carrying out nonlinear finite-element analysis (FEA). A metal prototype is fabricated for experimental study. Results demonstrate the effectiveness of the proposed ideas for a long-stroke, constant-force compliant mechanism dedicated to precision micropositioning applications. Experimental results also show the appearance of two-stage constant force due to the manufacturing errors of the bistable beams.

FIGURES IN THIS ARTICLE
<>
Copyright © 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Illustration of force (f) versus displacement (x) behaviors of a bistable mechanism (dashed line), a positive-stiffness mechanism (dash-dot line), and a constant-force mechanism (solid line)

Grahic Jump Location
Fig. 2

Conventional bistable flexure mechanism. (a) Configuration 1 and (b) configuration 2.

Grahic Jump Location
Fig. 3

Parameters and deformation of a fixed-guided beam

Grahic Jump Location
Fig. 4

Force–displacement behavior of a flexure beam for the bistable mechanism. (a) In-plane width h is varied; (b) beam length L is varied; and (c) inclined angle γ is varied.

Grahic Jump Location
Fig. 5

Proposed new bistable flexure mechanism. (a) Tilted-angle parallelogram flexure and (b) double tilted-angle parallelogram flexure.

Grahic Jump Location
Fig. 6

Force–displacement behavior of two different bistable mechanisms

Grahic Jump Location
Fig. 7

Force–displacement behaviors of the proposed bistable mechanism as the in-plane width h of the connecting beams varies

Grahic Jump Location
Fig. 8

Conceptual design of a constant-force flexure micropositioning mechanism. (a) Bistable mechanism, (b) positive-stiffness mechanism, and (c) constant-force mechanism.

Grahic Jump Location
Fig. 9

(a) Force–displacement behavior of the constant-force mechanism and the two component mechanisms and (b) force error between the analytical model and simulation results for the constant-force mechanism

Grahic Jump Location
Fig. 10

Nonlinear FEA results of the constant-force mechanism. The left part is the bistable mechanism and the right part is the positive-stiffness mechanism.

Grahic Jump Location
Fig. 11

(a) CAD model and (b) prototype of the designed constant-force stage

Grahic Jump Location
Fig. 12

Two stable positions (a) and (b) of the proposed bistable mechanism

Grahic Jump Location
Fig. 13

Force–displacement relationship of the fabricated prototype stage

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In