適応的重み付き制御バリア関数による冗長ロボットの安全制御
Safety Control of a Hyper-redundant Robot via Adaptive Weighted Control Barrier Functions
冗長ロボットの安全制約を満たしつつ、負荷の偏りによる追従誤差を低減する重み付き制御バリア関数を提案し、適応的重み付けで性能を向上させた。
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: Zijian Cai, Kiwan Wong, Wenci Xin, Wei Xiao, Daniela Rus, Cecilia Laschi
分類: cs.RO
原文アブストラクト
Hyper-redundant robots are well suited for confined-space manipulation due to their high dexterity, but safe operation in cluttered environments remains challenging. In addition, their slender structures often lead to uneven load distributions and nonuniform tracking errors along the body. To address these issues, this work proposes a weighted control barrier functions (W-CBFs) framework that enforces safety constraints while reducing tracking errors caused by uneven loading. The proposed controller was first evaluated on a circular path-following task under different obstacle configurations. With fixed weights, compared to the non-weighted method, the maximum reduction in root-mean-square (RMS) tracking error was 59.6\% in simulation and 87.7\% in physical experiments. An adaptive weighting strategy was then investigated based on the discrepancy between simulated and experimental performance under different mapping functions. The RMS errors were further reduced by 21.9\% and 8.5\%, respectively, although the error increases when obstacles were located close to the robot body. Finally, the robot was evaluated in a cleaning task requiring coverage of a rectangular area and compared with manual teleoperation. Although the controller was not explicitly optimized for area coverage, the autonomous strategy achieved comparable or better coverage performance while avoiding collisions with the surrounding frame, whereas collisions occurred during manual operation.
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