方向が鍵：力の方向を学習することで接触の多い操作のSim-to-Real転移を実現
Direction Matters: Learning Force Direction Enables Sim-to-Real Contact-Rich Manipulation
シミュレーションで人間設計の位置・力制御器を教師として使い、接触力の方向を予測する方策を学習。実機では力覚アダミタンス制御器を構成し、電子レンジ開けやペグ挿しなど4タスクで高い成功率と頑健性を示した。
詳しい要約
1. どんなもの？
2. 先行研究と比べてどこがすごい？
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著者: Yifei Yang, Anzhe Chen, Zhenjie Zhu, Kechun Xu, Yunxuan Mao, Yufei Wei, Lu Chen, Rong Xiong, Yue Wang
分類: cs.RO
原文アブストラクト
Sim-to-real transfer for contact-rich manipulation remains challenging due to the inherent discrepancy in contact dynamics. While existing methods often rely on costly real-world data or utilize blind compliance through fixed controllers, we propose a framework that leverages expert-designed controller logic for transfer. Inspired by the success of privileged supervision in kinematic tasks, we employ a human-designed finite state machine based position/force controller in simulation to provide privileged guidance. The resulting policy is trained to predict the end-effector pose, contact state, and crucially the desired contact force direction. Unlike force magnitudes, which are highly sensitive to simulation inaccuracies, force directions encode high-level task geometry and remain robust across the sim-to-real gap. At deployment, these predictions configure a force-aware admittance controller. By combining the policy's directional intent with a constant, low-cost manually tuned force magnitude, the system generates adaptive, task-aligned compliance. This tuning is lightweight, typically requiring only a single scalar per contact state. We provide theoretical analysis for stability and robustness to disturbances. Experiments on four real-world tasks, i.e., microwave opening, peg-in-hole, whiteboard wiping, and door opening, demonstrate that our approach significantly outperforms strong baselines in both success rate and robustness. Videos are available at: https://yifei-y.github.io/project-pages/DirectionMatters/.
