Learning Shape Control of Elastoplastic Deformable Linear Objects
Paper in proceeding, 2021

Deformable object manipulation tasks have long been regarded as challenging robotic problems. However, until recently very little work has been done on the subject, with most robotic manipulation methods being developed for rigid objects. Deformable objects are more difficult to model and simulate, which has limited the use of model-free Reinforcement Learning (RL) strategies, due to their need for large amounts of data that can only be satisfied in simulation. This paper proposes a new shape control task for Deformable Linear Objects (DLOs). More notably, we present the first study on the effects of elastoplastic properties on this type of problem. Objects with elastoplasticity such as metal wires, are found in various applications and are challenging to manipulate due to their nonlinear behavior. We first highlight the challenges of solving such a manipulation task from an RL perspective, particularly in defining the reward. Then, based on concepts from differential geometry, we propose an intrinsic shape representation using discrete curvature and torsion. Finally, we show through an empirical study that in order to successfully solve the proposed task using Deep Deterministic Policy Gradient (DDPG), the reward needs to include intrinsic information about the shape of the DLO.

Deformable models

Shape control

Geometry

Reinforcement learning

Metals

Wires

Shape

Author

Rita Laezza

Chalmers, Electrical Engineering, Systems and control, Mechatronics

Yiannis Karayiannidis

Chalmers, Electrical Engineering, Systems and control, Mechatronics

Proceedings - IEEE International Conference on Robotics and Automation

10504729 (ISSN)

4438-4444

2021 IEEE International Conference on Robotics and Automation
Xi'an, China,

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Subject Categories

Robotics

Control Engineering

Computer Science

DOI

10.1109/ICRA48506.2021.9561984

More information

Created

10/21/2021