機体レート制限下のクアッドロータ安全のための脱出対応制御バリア関数
Escape-Aware Control Barrier Functions for Quadrotor Safety under Body-Rate Limits
機体レート制限により推力方向を変えるのに時間がかかるクアッドロータで、状態のみの制御バリア関数が安全と誤認する問題を定式化し、状態と直前入力のペア上で脱出可能性を測る新しいバリア関数を提案した。
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著者: Lei Shi, Haosong Wen, Qichao Liu
分類: cs.RO
原文アブストラクト
Control barrier functions for input-constrained systems place the admissible input set inside the definition of the safe set, yet the resulting barrier is almost always a function of the state alone; On a quadrotor this is not cosmetic: because the thrust vector must be reoriented before it can decelerate an approach, and reorientation is limited by the attainable body rate, a state-only barrier certifies states from which no escape is reachable in time; We characterize the certification gap in closed form and show its width is proportional to closing speed and inversely proportional to the body-rate limit; We then define an escape barrier on the augmented pair of state and previously applied input, with escape authority measured over the one-step reachable thrust cap; It admits a closed form and an analytic inverse for the maximum certifiable closing speed, and embeds in a predictive controller at no additional state cost; Across 550 paired closed-loop episodes on a 13-state quadrotor, the proposed controller completes every tested scenario, whereas the stopping-distance barrier enforced over the same horizon fails 15% and 25% of episodes in exactly the two scenarios that enter the predicted gap; Against an online backup-CBF baseline enforcing the same escape condition at the reached state, it holds a 29-74 degree larger directional margin and 3-18 times the clearance, and an independent conservative rollout referee finds no certified state from which escape fails.