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Structural dynamics of a pulsed-jet propulsion system for underwater soft robots

Structural dynamics of a pulsed-jet propulsion system for underwater soft robots
Structural dynamics of a pulsed-jet propulsion system for underwater soft robots
This paper entails the study of the pulsed-jet propulsion inspired by cephalopods in the frame of underwater bioinspired robotics. This propulsion routine involves a sequence of consecutive cycles of inflation and collapse of an elastic bladder, which, in the robotics artefact developed by the authors, is enabled by a cable-driven actuation of a deformable shell composed of rubber-like materials. In the present work an all-comprehensive formulation is derived by resorting to a coupled approach that comprises of a model of the structural dynamics of the cephalopod-like elastic bladder and a model of the pulsed-jet thrust production. The bladder, or mantle, is modelled by means of geometrically exact, axisymmetric, nonlinear shell theory, which yields an accurate estimation of the forces involved in driving the deformation of the structure in water. By coupling these results with those from a standard thrust model, the behaviour of the vehicle propelling itself in water is derived. The constitutive laws of the shell are also exploited as control laws with the scope of replicating the muscle activation routine observed in cephalopods. The model is employed to test various shapes, material properties and actuation routines of the mantle. The results are compared in terms of speed performance in order to identify suitable design guidelines. Altogether, the model is tested in more than 50 configurations, eventually providing useful insight for the development of more advanced vehicles and bringing evidence of its reliability in studying the dynamics of both man-made cephalopod-inspired robots and live specimens.
1729-8806
1-18
Renda, Federico
495810c0-7ec1-4d22-a099-1cfe208aba95
Giorgio-Serchi, Francesco
8571dc14-19c1-4ed1-8080-d380736a6ffa
Boyer, Frederic
3ee9d74c-2df5-46e7-b315-a49a41497626
Laschi, Cecilia
302c8a64-0ba9-4d5c-9d6f-efcfd4acc64a
Renda, Federico
495810c0-7ec1-4d22-a099-1cfe208aba95
Giorgio-Serchi, Francesco
8571dc14-19c1-4ed1-8080-d380736a6ffa
Boyer, Frederic
3ee9d74c-2df5-46e7-b315-a49a41497626
Laschi, Cecilia
302c8a64-0ba9-4d5c-9d6f-efcfd4acc64a

Renda, Federico, Giorgio-Serchi, Francesco, Boyer, Frederic and Laschi, Cecilia (2015) Structural dynamics of a pulsed-jet propulsion system for underwater soft robots. International Journal of Advanced Robotic Systems, 1-18. (doi:10.5772/60143).

Record type: Article

Abstract

This paper entails the study of the pulsed-jet propulsion inspired by cephalopods in the frame of underwater bioinspired robotics. This propulsion routine involves a sequence of consecutive cycles of inflation and collapse of an elastic bladder, which, in the robotics artefact developed by the authors, is enabled by a cable-driven actuation of a deformable shell composed of rubber-like materials. In the present work an all-comprehensive formulation is derived by resorting to a coupled approach that comprises of a model of the structural dynamics of the cephalopod-like elastic bladder and a model of the pulsed-jet thrust production. The bladder, or mantle, is modelled by means of geometrically exact, axisymmetric, nonlinear shell theory, which yields an accurate estimation of the forces involved in driving the deformation of the structure in water. By coupling these results with those from a standard thrust model, the behaviour of the vehicle propelling itself in water is derived. The constitutive laws of the shell are also exploited as control laws with the scope of replicating the muscle activation routine observed in cephalopods. The model is employed to test various shapes, material properties and actuation routines of the mantle. The results are compared in terms of speed performance in order to identify suitable design guidelines. Altogether, the model is tested in more than 50 configurations, eventually providing useful insight for the development of more advanced vehicles and bringing evidence of its reliability in studying the dynamics of both man-made cephalopod-inspired robots and live specimens.

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Accepted/In Press date: 3 February 2015
Published date: 9 June 2015
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 395555
URI: http://eprints.soton.ac.uk/id/eprint/395555
ISSN: 1729-8806
PURE UUID: 80652fc4-30d1-4a9d-a0bb-80088a727598
ORCID for Francesco Giorgio-Serchi: ORCID iD orcid.org/0000-0002-5090-9007

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Date deposited: 01 Jun 2016 10:10
Last modified: 08 Jan 2022 00:48

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Contributors

Author: Federico Renda
Author: Francesco Giorgio-Serchi ORCID iD
Author: Frederic Boyer
Author: Cecilia Laschi

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