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Research Papers

Actuated Bistable Jumping Structures

[+] Author and Article Information
Matthew Santer

Department of Aeronautics, Imperial College London, Prince Consort Road, London SW7 2AZ, UKm.santer@imperial.ac.uk

J. Appl. Mech 77(3), 031009 (Feb 08, 2010) (9 pages) doi:10.1115/1.4000417 History: Received October 09, 2008; Revised August 14, 2009; Published February 08, 2010; Online February 08, 2010

The design and analysis of a fully actuated adaptive bistable structure is presented. This structure releases energy at a high frequency, which in consequence causes it to jump. Such structures have application as the basis for multistable adaptive systems. The dynamic transition of the bistable structure from its high-energy to low-energy stable states and the lower-frequency return transition are considered by reference to a specific example. The effect of embedded actuation on this behavior is also investigated.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

(a) Graph showing moment versus rotation for a paired tape spring and leaf spring and (b) jumping bistable structure concept, showing both stable states.

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Figure 2

(a) FEA of a tape spring in opposite-sense bending and (b) FEA of the bistable structure showing the stable equilibria when F2=0

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Figure 3

Functional representation of a full actuation cycle of a NiTi spring actuator (shown in the inset)

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Figure 4

Simplified dynamic model and associated free body diagram of the bistable jumping structure

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Figure 5

(a) Contact force R versus time evaluated using the simplified analytical model and (b) contact force R versus time evaluated using nonlinear dynamic FEA

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Figure 6

The dynamic FE model of the bistable jumping structure (a) neglecting resetting actuators and (b) including resetting actuators at the onset of jump showing the asymmetric transition path

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Figure 7

(a) Bistable structure at the jump apogee, reset actuators pre-extended and (b) bistable structure at the jump apogee reset actuators not pre-extended

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Figure 8

Minimum reset actuation force requirements and available reset actuation force over the transition from S2 to S1

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