@article {103,
	title = {Physical Human-Robot Interaction with a Tethered Aerial Vehicle: Application to a Force-based Human Guiding Problem},
	journal = {Transactions on Robotics},
	volume = {37},
	year = {2021},
	month = {2021/02},
	pages = {723-734},
	chapter = {723},
	abstract = {<p style="text-align: justify;">Today, physical Human-Robot Interaction (pHRI) is a very popular topic in the field of ground manipulation. At the same time, Aerial Physical Interaction (APhI) is also developing very fast. Nevertheless, pHRI with aerial vehicles has not been addressed so far. In this work, we present the study of one of the first systems in which a human is physically connected to an aerial vehicle by a cable. We want the robot to be able to pull the human toward a desired position (or along a path) only using forces as an indirect communication-channel. We propose an admittance-based approach that makes pHRI safe. A controller, inspired by the literature on flexible manipulators, computes the desired interaction forces that properly guide the human. The stability of the system is formally proved with a Lyapunov-based argument. The system is also shown to be passive, and thus robust to non-idealities like additional human forces, time-varying inputs, and other external disturbances. We also design a maneuver regulation policy to simplify the path following problem. The global method has been experimentally validated on a group of four subjects, showing a reliable and safe pHRI.</p>},
	doi = {10.1109/TRO.2020.3038700},
	url = {https://ieeexplore.ieee.org/document/9353246?source=authoralert},
	author = {Marco Tognon and Rachid Alami and Bruno Siciliano}
}
@article {94,
	title = {Human Physical Guidance by a Tethered Aerial Vehicle},
	year = {2020},
	month = {06/2020},
	publisher = {ICRA 2020, workshop on Shared Autonomy: Learning and Control},
	address = {Paris, France},
	abstract = {<p>Today, physical Human-Robot Interaction (pHRI) is a very popular topic in the field of ground manipulation. At the same time, Aerial Physical Interaction (APhI) is also developing very fast. Nevertheless, pHRI with aerial vehicles has not been addressed so far. In this work, we present the study of one of the first systems in which a human is physically connected to an aerial vehicle by a cable. We want the robot to be able to pull the human toward a desired position (or along a path) only using forces as an indirect communication-channel. We propose an admittance-based approach that makes pHRI safe. A controller, inspired by the literature on flexible manipulators, computes the desired interaction forces that properly guide the human. The stability of the system is formally proved with a Lyapunov-based argument. external disturbances. The global method has been experimentally validated showing a reliable and safe pHRI.</p>},
	author = {Marco Tognon and Rachid Alami and Bruno Siciliano}
}
