19 papers
Exact Thrust-Reversal Limits of Bidirectional Propellers under Bounded Motor Inputs
Ahmed Ali, Chiara Gabellieri, Antonio Franchi
Bidirectional propellers are often treated as signed thrust sources, but their thrust is a signed-quadratic function of rotor speed.Thus, thrust reversal necessarily occurs through…
A Morphing-Designed Hexarotor Prototype combining Practical Resilience and Efficiency
Murat Bronz, Mahmoud Hamandi, Elgiz Baskaya +2
This work demonstrates experimentally the existence of a hexarotor prototype, termed Opti-Hexa, that simultaneously achieves practical resilience to single-propeller failures and e…
Aerial Manipulation: Contact, Medium Coupling, and the Geometry of Readiness
Antonio Franchi
Aerial robots are increasingly moving from remote observation toward physical interaction with objects, surfaces, structures, loads, and surrounding flows. This review argues that…
Cyclic Nullspace Coordination: Perpetual Flight of Aerial Carriers for Static Suspension
Chiara Gabellieri, Yaolei Shen, Martina Paolucci +1
This work demonstrates that the non-stop flights of three or more carriers are compatible with holding a constant pose of a cable-suspended load. It also presents an algorithm for…
Variable Aerodynamic Damping Actuation via Co-Contraction: A Structural Analogy with Variable Stiffness Actuation
Antonio Franchi
This work identifies a passive aerodynamic damping effect induced by co-contraction in antagonistic redundant propulsion. Complementing prior work on aerodynamic promptness, which…
Lie Group Formulation of Recursive Dynamics Algorithms of Higher Order for Floating-Base Robots
Ahmed Ali, Chiara Gabellieri, Antonio Franchi
In this paper, we describe procedures for computing higher-order time derivatives of the Lie-group Newton-Euler, Articulated-Body Inertia, and hybrid dynamics algorithms for floati…