A new drone can change its shape to fly through a narrow gap

16 December 2018

share this:

A research team from the University of Zurich and EPFL has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.

Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying robot could look for people trapped inside and guide the rescue team towards them. But the drone would often have to enter the building through a crack in a wall, a partially open window, or through bars – something the typi-cal size of a drone does not allow.
To solve this problem, researchers from Scaramuzza lab at the University of Zurich and Floreano lab at EPFL created a new kind of drone. Both groups are part of the National Centre of Competence in Research (NCCR) Robotics funded by the Swiss National Science Foundation. Inspired by birds that fold their wings in mid-air to cross narrow passages, the new drone can squeeze itself to pass through gaps and then go back to its previous shape, all the while continuing to fly. And it can even hold and transport objects along the way.

Mobile arms can fold around the main frame
“Our solution is quite simple from a mechanical point of view, but it is very versatile and very au-tonomous, with onboard perception and control systems,” explains Davide Falanga, researcher at the University of Zurich and the paper’s first author. In comparison to other drones, this morphing drone can maneuver in tight spaces and guarantee a stable flight at all times.
The Zurich and Lausanne teams worked in collaboration and designed a quadrotor with four pro-pellers that rotate independently, mounted on mobile arms that can fold around the main frame thanks to servo-motors. The ace in the hole is a control system that adapts in real time to any new position of the arms, adjusting the thrust of the propellers as the center of gravity shifts.
“The morphing drone can adopt different configurations according to what is needed in the field,” adds Stefano Mintchev, co-author and researcher at EPFL. The standard configuration is X-shaped, with the four arms stretched out and the propellers at the widest possible distance from each other. When faced with a narrow passage, the drone can switch to a “H” shape, with all arms lined up along one axis or to a “O” shape, with all arms folded as close as possible to the body. A “T” shape can be used to bring the onboard camera mounted on the central frame as close as possible to objects that the drone needs to inspect.

First step to fully autonomous rescue searches
In the future, the researchers hope to further improve the drone structure so that it can fold in all three dimensions. Most importantly, they want to develop algorithms that will make the drone truly autonomous, allowing it to look for passages in a real disaster scenario and automatically choose the best way to pass through them. “The final goal is to give the drone a high-level instruction such as ‘enter that building, inspect every room and come back’ and let it figure out by itself how to do it,” says Falanga.

Davide Falanga, Kevin Kleber, Stefano Mintchev, Dario Floreano, Davide Scaramuzza. The Foldable Drone: A Morphing Quadrotor that can Squeeze and Fly. IEEE Robotics and Auto-mation Letter, 10 December 2018. DOI:10.1109/LRA.2018.2885575


NCCR Robotics

Related posts :

How robots learn to hike

A new control approach that enables a legged robot, called ANYmal, to move quickly and robustly over difficult terrain.
20 January 2022, by

How robots and bubbles could soon help clean up underwater litter

Everyone loves to visit the seaside, whether to enjoy the physical benefits of an exhilarating swim or simply to relax on the beach and catch some sun. But these simple life affirming pleasures are easily ruined by the presence of litter, which if persistent can have a serious negative impact on both the local environment and economy. However, help is at hand to ensure the pristine nature of our coastlines.
19 January 2022, by

Maria Gini wins the 2022 ACM/SIGAI Autonomous Agents Research Award

Congratulations to Maria Gini on winning this prestigious award, recognising her research and leadership in the field of robotics and multi-agent systems.
18 January 2022, by

UN fails to agree on ‘killer robot’ ban as nations pour billions into autonomous weapons research

Given the pace of research and development in autonomous weapons, the U.N. meeting might have been the last chance to head off an arms race.
16 January 2022, by

Science Magazine robot videos 2021

A compilation of Science Magazine videos featuring robotics research that were released during last year.
14 January 2022, by

CBQ: Commercial-grade Autonomous Mowers, Safety, and Dogfooding | Sense Think Act Podcast #11

In this episode, Audrow Nash speaks to Charles Brian Quinn (aka, CBQ), CEO and a Co-Founder of Greenzie. Greenzie make an autonomous driving system for commercial lawn mowers. We talk about Greenzie's...
11 January 2022, by and

©2021 - ROBOTS Association


©2021 - ROBOTS Association