Backstepping Control of Tendon-Driven Continuum Robots in Large Deflections Using the Cosserat Rod Model

TL;DR

This paper develops a backstepping control method for tendon-driven continuum robots with large deflections, using the Cosserat rod model, and validates its effectiveness through experiments demonstrating improved performance and robustness.

Contribution

It introduces a novel backstepping control approach for large deflections in continuum robots modeled by Cosserat rods, with experimental validation and robustness analysis.

Findings

Achieves large deflections with smoother trajectories

Reduces settling time and overshoot

Demonstrates robustness against external forces and disturbances

Abstract

This paper presents a study on the backstepping control of tendon-driven continuum robots for large deflections using the Cosserat rod model. Continuum robots are known for their flexibility and adaptability, making them suitable for various applications. However, modeling and controlling them pose challenges due to their nonlinear dynamics. To model their dynamics, the Cosserat rod method is employed to account for significant deflections, and a numerical solution method is developed to solve the resulting partial differential equations. Previous studies on controlling tendon-driven continuum robots using Cosserat rod theory focused on sliding mode control and were not tested for large deflections, lacking experimental validation. In this paper, backstepping control is proposed as an alternative to sliding mode control for achieving a significant bending. The numerical results are validated through experiments in this study, demonstrating that the proposed backstepping control approach is a promising solution for achieving large deflections with smoother trajectories, reduced settling time, and lower overshoot. Furthermore, two scenarios involving external forces and disturbances were introduced to further highlight the robustness of the backstepping control approach.