0
Research Papers

A Spatial Eight-Bar Linkage and Its Association With the Deployable Platonic Mechanisms

[+] Author and Article Information
Guowu Wei

Research Associate
Centre for Robotics Research,
School of Natural and Mathematical Sciences,
King's College London,
University of London,
London WC2R 2LS, UK
e-mail: guowu.wei@kcl.ac.uk

Jian S. Dai

Chair of Mechanisms and Robotics
International Centre for
Mechanisms and Robotics,
MoE Key Laboratory for Mechanism Theory and
Equipment Design,
Tianjin University,
Tianjin 300072, China
Centre for Robotics Research,
School of Natural and Mathematical Sciences,
King's College London,
University of London,
London WC2R 2LS, UK
e-mail: jian.dai@kcl.ac.uk

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANISMS AND ROBOTICS. Manuscript received April 12, 2013; final manuscript received September 2, 2013; published online March 12, 2014. Assoc. Editor: Andrew P. Murray.

J. Mechanisms Robotics 6(2), 021010 (Mar 12, 2014) (9 pages) Paper No: JMR-13-1071; doi: 10.1115/1.4025472 History: Received April 12, 2013; Revised September 02, 2013

This paper presents for the first time a novel two degrees of freedom (2-DOF) single-looped dual-plane-symmetric spatial eight-bar linkage with exact straight-line motion. Geometry and kinematics of the eight-bar linkage are investigated and closed-form equations are presented revealing the exact straight-line motion feature of the linkage on the condition that two symmetric inputs are given. In order to secure two symmetric inputs, a geared eight-bar linkage is then proposed converting the linkage into a 1-DOF linkage of exact straight-line motion. The direction of the straight-line motion produced by the proposed eight-bar linkage is changeable and is only dependent on the structure parameters of the two pairs of V-shaped R-R dyads of the linkage. Further, the proposed eight-bar linkage is applied to the synthesis and construction of a group of deployable Platonic mechanisms with radially reciprocating motion. The virtual-center-based (VCB) method is presented for the synthesis and prototypes of the deployable Platonic mechanisms are fabricated verifying the mobility and motion of the proposed mechanisms.

FIGURES IN THIS ARTICLE
<>
Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

A dual-plane-symmetric spatial eight-bar linkage

Grahic Jump Location
Fig. 2

Geometric parameters of the eight-bar linkage

Grahic Jump Location
Fig. 3

Exact straight-line motion traced by point P

Grahic Jump Location
Fig. 4

The eight-bar linkage with various angles ϕ1 and ϕ2

Grahic Jump Location
Fig. 5

Angle β relative to angles ϕ1 and ϕ2

Grahic Jump Location
Fig. 6

The eight-bar linkage with ϕ1 = ϕ2 = 90 deg

Grahic Jump Location
Fig. 7

A geared eight-bar linkage of exact straight-line motion

Grahic Jump Location
Fig. 9

Synthesis of a deployable hexahedral mechanism

Grahic Jump Location
Fig. 10

Prototype of a deployable hexahedral mechanism

Grahic Jump Location
Fig. 11

Prototypes of deployable Platonic mechanisms

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