Coordinated Multi-Robot Trajectory Tracking Control over Sampled Communication
| Autor: | Rossi, Enrica, Tognon, Marco, Ballotta, Luca, Carli, Ruggero, Cortés, Juan, Franchi, Antonio, Schenato, Luca |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Automatica 151 (2023) 110941 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.automatica.2023.110941 |
| Popis: | In this paper, we propose an inverse-kinematics controller for a class of multi-robot systems in the scenario of sampled communication. The goal is to make a group of robots perform trajectory tracking in a coordinated way when the sampling time of communications is much larger than the sampling time of low-level controllers, disrupting theoretical convergence guarantees of standard control design in continuous time. Given a desired trajectory in configuration space which is precomputed offline, the proposed controller receives configuration measurements, possibly via wireless, to re-compute velocity references for the robots, which are tracked by a low-level controller. We propose joint design of a sampled proportional feedback plus a novel continuous-time feedforward that linearizes the dynamics around the reference trajectory: this method is amenable to distributed communication implementation where only one broadcast transmission is needed per sample. Also, we provide closed-form expressions for instability and stability regions and convergence rate in terms of proportional gain $k$ and sampling period $T$. We test the proposed control strategy via numerical simulations in the scenario of cooperative aerial manipulation of a cable-suspended load using a realistic simulator (Fly-Crane). Finally, we compare our proposed controller with centralized approaches that adapt the feedback gain online through smart heuristics, and show that it achieves comparable performance. Comment: 23 pages (main article: 14 pages; appendix: 9 pages), 18 figures; accepted for publication on Automatica; final accepted version |
| Databáze: | arXiv |
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