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Ultra-fast escape maneuver of an octopus-inspired robot

Ultra-fast escape maneuver of an octopus-inspired robot
Ultra-fast escape maneuver of an octopus-inspired robot
We design and test an octopus-inspired flexible hull robot that demonstrates outstanding fast-starting performance. The robot is hyper-inflated with water, and then rapidly deflates to expel the fluid so as to power the escape maneuver. Using this robot we verify for the first time in laboratory testing that rapid size-change can substantially reduce separation in bluff bodies traveling several body lengths, and recover fluid energy which can be employed to improve the propulsive performance. The robot is found to experience speeds over ten body lengths per second, exceeding that of a similarly propelled optimally streamlined rigid rocket. The peak net thrust force on the robot is more than 2.6 times that on an optimal rigid body performing the same maneuver, experimentally demonstrating large energy recovery and enabling acceleration greater than 14 body lengths per second squared. Finally, over 53%
of the available energy is converted into payload kinetic energy, a performance that exceeds the estimated energy conversion efficiency of fast-starting fish. The Reynolds number based on final speed and robot length is Re ? 700 000. We use the experimental data to establish a fundamental deflation scaling parameter ?* which characterizes the mechanisms of flow control via shape change. Based on this scaling parameter, we find that the fast-starting performance improves with increasing size
1748-3182
Weymouth, G.D.
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Subramaniam, V.
6d97f521-e4fb-43ca-9245-463f83cc1c00
Triantafyllou, M.S
46c91591-02a1-44f9-8204-d7430ced92a0
Weymouth, G.D.
b0c85fda-dfed-44da-8cc4-9e0cc88e2ca0
Subramaniam, V.
6d97f521-e4fb-43ca-9245-463f83cc1c00
Triantafyllou, M.S
46c91591-02a1-44f9-8204-d7430ced92a0

Weymouth, G.D., Subramaniam, V. and Triantafyllou, M.S (2015) Ultra-fast escape maneuver of an octopus-inspired robot. Bioinspiration & Biomimetics, 10 (1), [16016]. (doi:10.1088/1748-3190/10/1/016016).

Record type: Article

Abstract

We design and test an octopus-inspired flexible hull robot that demonstrates outstanding fast-starting performance. The robot is hyper-inflated with water, and then rapidly deflates to expel the fluid so as to power the escape maneuver. Using this robot we verify for the first time in laboratory testing that rapid size-change can substantially reduce separation in bluff bodies traveling several body lengths, and recover fluid energy which can be employed to improve the propulsive performance. The robot is found to experience speeds over ten body lengths per second, exceeding that of a similarly propelled optimally streamlined rigid rocket. The peak net thrust force on the robot is more than 2.6 times that on an optimal rigid body performing the same maneuver, experimentally demonstrating large energy recovery and enabling acceleration greater than 14 body lengths per second squared. Finally, over 53%
of the available energy is converted into payload kinetic energy, a performance that exceeds the estimated energy conversion efficiency of fast-starting fish. The Reynolds number based on final speed and robot length is Re ? 700 000. We use the experimental data to establish a fundamental deflation scaling parameter ?* which characterizes the mechanisms of flow control via shape change. Based on this scaling parameter, we find that the fast-starting performance improves with increasing size

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Accepted/In Press date: 9 January 2015
e-pub ahead of print date: 2 February 2015
Published date: 2 February 2015
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 379964
URI: http://eprints.soton.ac.uk/id/eprint/379964
ISSN: 1748-3182
PURE UUID: 6bfaf316-b011-48ad-8beb-0bed172765b5
ORCID for G.D. Weymouth: ORCID iD orcid.org/0000-0001-5080-5016

Catalogue record

Date deposited: 27 Aug 2015 13:24
Last modified: 28 Apr 2022 02:09

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Contributors

Author: G.D. Weymouth ORCID iD
Author: V. Subramaniam
Author: M.S Triantafyllou

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