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Morphologically induced stability on an underwater legged robot with a deformable body

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages14
JournalInternational Journal of Robotics Research (IJRR)
Early online date29 Mar 2019
DOIs
DateAccepted/In press - 4 Mar 2019
DateE-pub ahead of print (current) - 29 Mar 2019

Abstract

For robots to navigate successfully in the real-world, unstructured environment adaptability is a prerequisite. While this is typically implemented within the control layer, there have been recent proposals of adaptation through a morphing of the body. However, the successful demonstration of this approach has mostly been theoretical and in simulations thus far. In this work we present an underwater hopping robot that features a deformable body implemented as a
deployable structure which is covered by a soft skin for which it is possible to manually change the body size without altering any other property (e.g. buoyancy or weight). For such a system, we show that it is possible to induce a stable hopping behaviour instead of a fall, by just increasing the body size. We provide a mathematical model that describes the hopping behaviour of the robot under the influence of shape-dependent underwater contributions (drag,
buoyancy and added mass) in order to analyse and compare the results
obtained. Moreover, we show that for certain conditions, a stable hopping behaviour can only be obtained through changing the morphology of the robot as the controller (i.e. actuator) would already be working at maximum capacity. The presented work demonstrates that, through the exploitation of shape-dependent forces, the dynamics of a system can be modified through altering the morphology of the body to induce a desirable behaviour and, thus, a morphological change can be an effective alternative to the classic control.

    Research areas

  • morphological computation, soft robotics, deformable robot, legged locomotion, underwater robotics

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Sage at https://journals.sagepub.com/doi/10.1177/0278364919840426 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1 MB, PDF document

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