二次計画法によるマルチロボット系の安全なエルゴディック制御
Safe Ergodic Control for Multi-Robot Systems via Quadratic Programming
ガウスカーネルに基づく時間微分可能なエルゴディック指標を制御バリア関数として組み込み、安全性とエルゴディック性を同時に扱う二次計画法ベースの制御器を提案し、3機の飛行ロボットで実機検証した。
詳しい要約
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著者: Yo Toyomoto, Mohamed Elobaid, Bryce L. Ferguson, Alberto Quattrini Li, Shinkyu Park
分類: cs.RO
原文アブストラクト
Ergodic control drives robots to spend time in each region in proportion to a spatial distribution of interest, making it well suited for dense spatiotemporal environmental monitoring. Existing safe ergodic controllers rely on offline trajectory optimization or hierarchical architectures, which limit real-time applicability and decouple the ergodicity objective from the safety constraint. This paper presents a quadratic programming (QP)-based controller that treats ergodicity and safety jointly. We first introduce a Gaussian-kernel ergodic metric that, unlike the classical indicator-based metric, is time differentiable. This allows the exponential decay of the metric to be imposed as a time-varying control barrier function (CBF) constraint, relaxed by a slack variable, alongside hard CBF constraints for region containment and inter-robot collision avoidance. We establish that the resulting QP remains feasible from any safe initial configuration and that, up to the slack term, the ergodic metric decays exponentially. Simulations show improved performance over baseline methods, and experiments with three aerial vehicles validate the work on real hardware.