Research Papers

Accommodating Thickness in Origami-Based Deployable Arrays1

[+] Author and Article Information
Shannon A. Zirbel

Department of Mechanical Engineering,
Brigham Young University,
Provo, UT 84602

Robert J. Lang

Lang Origami,
Alamo, CA 94507

Brian P. Trease

Jet Propulsion Laboratory,
California Institute of Technology,
Pasadena, CA 91109

Larry L. Howell

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

Submitted to ASME IDETC with Paper No. DETC2013-12348.

2Corresponding author.

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received January 31, 2013; final manuscript received June 17, 2013; published online October 3, 2013. Assoc. Editor: Mary Frecker. The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Mech. Des 135(11), 111005 (Oct 03, 2013) (11 pages) Paper No: MD-13-1046; doi: 10.1115/1.4025372 History: Received January 31, 2013; Revised June 17, 2013

The purpose of this work is to develop approaches to accommodate thickness in origami-based deployable arrays with a high ratio of deployed-to-stowed diameter. The origami flasher model serves as a basis for demonstrating the approach. A thickness-accommodating mathematical model is developed to describe the flasher. Practical modifications are presented for the creation of physical models and two options are proposed: allowing the panels to fold along their diagonals or applying a membrane backing with specified widths at fold-lines. The mathematical model and hardware modifications are employed to create several physical models. The results are general and apply to a range of applications. An example is provided by the application that motivated the work: a deployable solar array for space applications. The model is demonstrated in hardware as a 1/20th scale prototype with a ratio of deployed-to-stowed diameter of 9.2 (or 1.25 m deployed outer diameter to 0.136 m stowed outer diameter).

Copyright © 2013 by ASME
Topics: Thickness , Membranes
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Fig. 3

Crease pattern for the Miura-ori fold, based on Refs. [8,9]

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Fig. 2

Two approaches for enabling origami with thickness, from Tachi [2]: (a) The axis of rotation for the fold is shifted from the midline of the material to the material surface. (b) Material is removed near the fold line. In both (a) and (b), the dashed line represents the zero-thickness model.

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Fig. 1

The four-sided flasher model is shown in paper, with the crease pattern overlaid. Mountain folds are indicated with solid red lines; valley folds are indicated with dashed blue lines.

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Fig. 4

Comparison of (a) ideal and (b) thickness-accommodating winding membrane from Guest and Pellegrino [11]

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Fig. 5

The six-sided flasher model. (a) Model assuming zero-thickness. (b) Crease pattern for the model assuming finite thickness, with additional diagonal folds included to enable rigid-foldability.

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Fig. 6

The parameters for defining the mathematical model are (a) rotational order, m, which is the number of sectors around the central polygon, (b) height order, h, which is the number of axial bends between the bottom and top of the folded cylinder, and (c) number of rings, r

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Fig. 7

A single labeled sector of crease pattern (left) and folded form (right), showing how the vertices are indexed. In the crease pattern, the central polygon is outlined in light grey. For this sector, m = 6, h = 2, r = 2.

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Fig. 8

A thickness-accommodating flasher (m = 6, h = 2, r = 2, δ = 0.1). Top row, l–r: crease pattern, single sector; folded form, single sector; folded form, side view. Bottom row, l–r: full crease pattern; full folded form; top view, folded form.

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Fig. 9

The six-sided flasher (m = 6, h = 3, r = 1) is rigid-foldable when additional fold-lines are added to the model along the diagonals of each panel. (a) The model in its deployed configuration. (b) The model in its stowed configuration. The valley folds are marked by the bold black lines.

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Fig. 10

The gap width was adjusted at fold-lines to enable rigid folding of the model on a membrane backing. In this model, m = 6, h = 3, r = 1.

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Fig. 11

The folds of the membrane model are illustrated with the panels in blue and the membrane as the dashed red line. The gap sizes defined here are lower limits. (a) The 180 deg mountain folds require minimal gap between panels because the membrane folds back on itself. (b) The 180 deg valley folds require a minimum of twice the thickness of the panels because the membrane folds around two panels. (c) The 60 deg valley folds require a minimum of one thickness because of the triangle formed by the panel edges.

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Fig. 12

A rigid-foldable six-sided flasher (m = 6, h = 2, r = 1). The thickness of the panels governs the final size of the stowed model. (a) Deployed configuration; the orange path marks the number of panels on each side of the stowed model. (b) The rigid panels are taped on the side corresponding to the direction of the fold (mountain or valley). (c) Stowed configuration.

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Fig. 13

A computer-generated model of the solar array as it might work on a spacecraft

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Fig. 14

1/20th scale model of the deployable hex-flasher (m = 6, h = 4, r = 2, δ = 0.01). The deployed-to-stowed diametral ratio of the model is 9.2.



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