リアプノフ指数を用いた空中ロボットの物理的相互作用におけるパワー制限安全層
Power-based Safety Layer for Aerial Vehicles in Physical Interaction using Lyapunov Exponents
最大リアプノフ指数で誤差ダイナミクスの発散を検出し、制御バリア関数と組み合わせてパワー制限を課す安全層を提案。全方向性ドローンの自由飛行と接触タスクで実証した。
著者: Eugenio Cuniato, Nicholas Lawrance, Marco Tognon, Roland Siegwart
分類: cs.RO, cs.SY, eess.SY
原文アブストラクト
As the performance of autonomous systems increases, safety concerns arise, especially when operating in non-structured environments. To deal with these concerns, this work presents a safety layer for mechanical systems that detects and responds to unstable dynamics caused by external disturbances. The safety layer is implemented independently and on top of already present nominal controllers, like pose or wrench tracking, and limits power flow when the system's response would lead to instability. This approach is based on the computation of the Largest Lyapunov Exponent (LLE) of the system's error dynamics, which represent a measure of the dynamics' divergence or convergence rate. By actively computing this metric, divergent and possibly dangerous system behaviors can be promptly detected. The LLE is then used in combination with Control Barrier Functions (CBFs) to impose power limit constraints on a jerk controlled system. The proposed architecture is experimentally validated on an Omnidirectional Micro Aerial Vehicle (OMAV) both in free flight and interaction tasks.
