Actuation space reduction to facilitate insightful shape matching in a novel reconfigurable tendon driven continuum manipulator
For researchers in continuum robotics, this provides a model-free actuation framework that simplifies control of reconfigurable manipulators, though it is an incremental step over existing methods.
This work introduces a reconfigurable tendon-driven continuum manipulator where spacer disks can be actively rotated to reroute tendons, and proposes a simplified shape-matching strategy using curvature-torsion projection that reduces the actuation space. The method enables sequential adjustment of disks to approximate global shape and fine-tune end-effector position without complex modeling.
In tendon driven continuum manipulators (TDCMs), reconfiguring the tendon routing enables tailored spatial deformation of the backbone. This work presents a design in which tendons can be rerouted either prior to or after actuation by actively rotating the individual spacer disks. Each disk rotation thus adds a degree of freedom to the actuation space, complicating the mapping from a desired backbone curve to the corresponding actuator inputs. However, when the backbone shape is projected into an intermediate space defined by curvature and torsion (C-T), patterns emerge that highlight which disks are most influential in achieving a global shape. This insight enables a simplified, sequential shape-matching strategy: first, the proximal and intermediate disks are rotated to approximate the global shape; then, the distal disks are adjusted to fine-tune the end-effector position with minimal impact on the overall shape. The proposed actuation framework offers a model-free alternative to conventional control approaches, bypassing the complexities of modeling reconfigurable TDCMs.