Effects of compliance in pedundulatory locomotion over granular substrates

Authors Organisations
  • Michael Sfakiotakis(Author)
  • Avgousta Chatzidaki(Author)
    Foundation for Research & Technology – Hellas
  • Theodoros Evdaimon(Author)
    Foundation for Research & Technology – Hellas
  • Asimina Kazakidi(Author)
    University of Strathclyde
  • Dimitris Tsakiris(Author)
Type Paper
Original languageEnglish
Pages692-698
Number of pages7
DOI
Publication statusPublished - Jun 2016
Event24th Mediterranean Conference on Control and Automation (MED’16) - Athens, Greece
Duration: 21 Jun 201624 Jun 2016

Conference

Conference24th Mediterranean Conference on Control and Automation (MED’16)
Abbreviated titleMED'16
CountryGreece
CityAthens
Period21 Jun 201624 Jun 2016
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Abstract

The present paper investigates the effect of compliance on the locomotion of a biologically-inspired soft-body pedundulatory robotic system, employing lateral undulations of its elongated body, which are augmented by the oscillation of sets of lateral appendages (parapodia), to propel itself on unstructured granular substrates. We explore control strategy alternatives for the robot to generate two different locomotor gaits by employing direct or retrograde lateral body waves, combined with appropriately coordinated parapodial motion (pedundulatory modes). Computational models of this class of robots have been devised, which demonstrate the effects of joint compliance on gait generation and on the characteristics of robot propulsion. A new three-segment soft-body robotic prototype has been developed, whose body was fabricated by molding polyurethane elastomers, and was tested extensively on an experimental sandbox, on various formations of the granular substrate, to compare the performance of stiff and compliant joints. Body and joint compliance were found to enhance the adaptability of the robot to environmental irregularities, however they may deteriorate the proper formation of the un-dulatory body wave, degrading somewhat system performance in terms of the attained velocities

Keywords

  • biologically inspired systems, robotics, soft robotics, undulatory robotics, compliance, sand