下肢外骨格用ケーブル駆動差動アクチュエーションシステムの摩擦特性評価
Friction Characterization of a Cable-Driven Differential Actuation System for Lower-Limb Exoskeletons
下肢外骨格の股関節・膝関節の屈曲/伸展を2つのモータで協調駆動する差動アクチュエーション機構を提案し、トルクセンサなしで正確な関節トルクを推定するためのモデルベース摩擦補償手法を開発・実機検証した。
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著者: Alberto Maria Nobili, Fabio Salsedo, Alessandro Filippeschi
分類: cs.RO, cs.SY, eess.SY
原文アブストラクト
Lower-limb exoskeletons require actuation systems that can provide accurate joint torque control while preserving low mass and encumbrance. Conventional architectures often rely on independently actuated joints and joint-level torque sensors, increasing system complexity and weight. This paper presents a novel differential actuation architecture for hip-knee flexion/extension, enabling cooperative torque sharing between two motors via a linear differential mapping between motor and joint. To compensate for transmission losses, a model-based friction estimation strategy is developed and experimentally implemented, allowing accurate joint torque estimation without the need for torque sensors. The proposed solution is validated on a physical prototype, demonstrating the feasibility of sensorless torque estimation in a differentially actuated hip-knee module of a lower-limb exoskeleton.
