King's College London

Research portal

A Geometry Deformation Model for Braided Continuum Manipulators

Research output: Contribution to journalArticle

S. M. Hadi Sadati ; S. Elnaz Naghibi ; Ali Shiva ; Yohan Noh ; Aditya Gupta ; Ian D. Walker ; Kaspar Althoefer ; Thrishantha Nanayakkara

Original languageEnglish
Article number22
JournalFront. Robot. AI
Volume4
DOIs
StatePublished - 30 Jun 2017

Documents

King's Authors

Abstract

Continuum manipulators have gained significant attention in the robotic community due to their high dexterity, deformability, and reachability. Modeling of such manipulators has been shown to be very complex and challenging. Despite many research attempts, a general and comprehensive modeling method is yet to be established. In this paper, for the first time, we introduce the bending effect in the model of a braided extensile pneumatic actuator with both stiff and bendable threads. Then, the effect of the manipulator cross-section deformation on the constant curvature and variable curvature models is investigated using simple analytical results from a novel geometry deformation method and is compared to experimental results. We achieve 38% mean reference error simulation accuracy using our constant curvature model for a braided continuum manipulator in presence of body load and 10% using our variable curvature model in presence of extensive external loads. With proper model assumptions and taking to account the cross-section deformation, a 7–13% increase in the simulation mean error accuracy is achieved compared to a fixed cross-section model. The presented models can be used for the exact modeling and design optimization of compound continuum manipulators by providing an analytical tool for the sensitivity analysis of the manipulator performance. Our main aim is the application in minimal invasive manipulation with limited workspaces and manipulators with regional tunable stiffness in their cross section.

Download statistics

No data available

View graph of relations

© 2015 King's College London | Strand | London WC2R 2LS | England | United Kingdom | Tel +44 (0)20 7836 5454