Details

Autor(en) / Beteiligte

• Yoon, Minsung
• Kang, Mincheul
• Park, Daehyung
• Yoon, Sung-Eui

Titel

Learning-based Initialization of Trajectory Optimization for Path-following Problems of Redundant Manipulators

Ist Teil von

• 2023 IEEE International Conference on Robotics and Automation (ICRA), 2023, p.9686-9692

Ort / Verlag

IEEE

Erscheinungsjahr

2023

Quelle

IEEE

Beschreibungen/Notizen

• Trajectory optimization (TO) is an efficient tool to generate a redundant manipulator's joint trajectory following a 6-dimensional Cartesian path. The optimization performance largely depends on the quality of initial trajectories. However, the selection of a high-quality initial trajectory is non-trivial and requires a considerable time budget due to the extremely large space of the solution trajectories and the lack of prior knowledge about task constraints in configuration space. To alleviate the issue, we present a learning-based initial trajectory generation method that generates high-quality initial trajectories in a short time budget by adopting example-guided reinforcement learning. In addition, we suggest a null-space projected imitation reward to consider null-space constraints by efficiently learning kinematically feasible motion captured in expert demonstrations. Our statistical evaluation in simulation shows the improved optimality, efficiency, and applicability of TO when we plug in our method's output, compared with three other baselines. We also show the performance improvement and feasibility via real-world experiments with a seven-degree-of-freedom manipulator.