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Flying Robots

The future of drones for search and rescue

Search-and-rescue requires adaptability and agility far beyond current state-of-the-art drones. For instance, the tasks of flying inside partially collapsed buildings, manoeuvring at high speed in a forest or among buildings, safely transporting cargo of varying size and weight in complex environments, performing dexterous yet forceful manipulation, or transitioning to the ground for inspection, require a completely new class of drones.

The main objective of this project was to develop a new class of agile flying vehicles for gathering data, collecting items, and delivering first-aid tools in extended areas as well as in cluttered environments. This objective was addressed by advancing the state of the art in mechanical design, electronic design, and control algorithms.

Labs involved: D. Floreano, D. Scaramuzza, R. Siegwart, L. Gambardella, T. Delbruck

Foldable Drone

Inspired by birds that fold their wings in mid-air to cross narrow passages, this drone developed in collaboration by the Floreano and Scaramuzza labs 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.

Its four independently rotating arms can fold in various ways, while a control scheme that can take into account the current morphology of the vehicle to guarantee stable flight.

A drone on the ground

Related publications

  • Falanga, K. Kleber, S. Mintchev, D. Floreano, D. Scaramuzza, “The Foldable Drone: A Morphing Quadrotor that can Squeeze and Fly”, IEEE Robotics and Automation Letters (RA-L), Vol. 4, no. 2, Apr. pp 209-216, 2019.

Packdrone

It is a quadcopter surrounded by a foldable cage that provides an all-round protective structure that physically separates the propellers from the environment, ensuring the safety of people in the vicinity. The whole structure of the drone can be easily folded with a single movement, significantly reducing its size for ease of storage and transportation.

This drone, designed by Dronistics, allows safe last-cm delivery of parcels, directly to the user and in areas with no traditional landing site. It can be used in emergency situations or for civilian applications, such as aerial delivery to remote areas.

Picture of a flying drone with an exterior structure that protects it and a box inside that allows it to carry things

Related publications

  • M. Kornatowski, M. Feroskhan, W. J. Stewart, and D. Floreano, “Downside Up: Rethinking Parcel Position for Aerial Delivery”, IEEE Robotics and Automation Letters, vol. 5, no. 3, pp. 4297–4304, July 2020.
  • M. Kornatowski, M. Feroskhan, W. J. Stewart, and D. Floreano, “A Morphing Cargo Drone for Safe Flight in Proximity of Humans”, IEEE Robotics and Automation Letters, vol. 5, no. 3, pp. 4233–4240, July 2020.

Manipulation with drones

Drone are gaining growing attention due to their capabilities of reaching areas inaccessible by other types of robots, their agility, and simple mechanical structure. But the very way they fly and their typical size make it difficult to provide them with the manipulation capabilities that are commonly found in other types of robots.

NCCR robotics researchers (in particular, Roland Siegwart’s lab at ETH Zurich) developped new flying manipulators that are lightweight and yet capable of generating significant forces, and new flying robots that can move in all directions thanks to novel arrangements of propellers with controllable thrust directions. These flying robots are equipped with a robot arm, enabling physical interaction with their environment, and manipulation operations from the air.

Related publications

  • Allenspach M, Bodie K, Brunner M, et al. Design and optimal control of a tiltrotor micro-aerial vehicle for efficient omnidirectional flight. The International Journal of Robotics Research. 2020;39(10-11):1305-1325.
  • Bodie, M. Brunner, M. Pantic, S. Walser, P. Pfandler, U. Angst, R. Siegwart, and J. Nieto, “Active Interaction Force Control for Omnidirectional Aerial Contact-Based Inspection”, IEEE Transactions on Robotics, 2020,
  • Zhang, M. Brunner, L. Ott, M. Kamel, R. Siegwart, and J. Nieto, “Learning dynamics for improving control of overactuated flying systems”, IEEE Robotics and Automation Letters, vol. 5, no. 4, pp. 5283–5290, Jan. 2020.
  • Brunner, K. Bodie, M. Kamel, M. Pantic, W. Zhang, J. Nieto, and R. Siegwart, “Trajectory Tracking Nonlinear Model Predictive Control for an Overactuated MAV”, IEEE International Conferences on Robotics and Automation, June 2020.

LISHawk

The Floreano lab designed a drone, inspired by birds of prey, that can adjust the shape of its wing and tail thanks to its artificial feathers.

The drone changes the shape of its wing and tail to change direction faster, fly slower without falling to the ground, and reduce air resistance when flying fast. The advantage of winged drones over quadrotors is that they have a longer flight time for the same weight. However, quadrotors can hover in place and make sharp turns.

This hawk-inspired drone is somewhere in the middle. It can fly for a long time yet is almost as agile as quadrotors – a combination of features that is especially useful for flying in forests or in cities between buildings.

Related publications

  • Ajanic, M. Feroskhan, S. Mintchev, F. Noca, and D. Floreano, “Bio-inspired Synergistic Wing and Tail Morphing Extends Drone Flight Capabilities”, Science Robotics :Vol. 5, Issue 47, eabc2897, 2020.

Event cameras for drones

Using a novel type of cameras called event cameras, a flying robot can detect and avoid fast-moving objects.

Traditional video cameras, such as the ones found in every smartphone, work by regularly taking snapshots of the whole scene. This is done by exposing the pixels of the image all at the same time. This way, though, a moving object can only be detected after all the pixels have been analysed by the on-board computer.

Event cameras, on the other hand, have smart pixels that work independently of each other. The pixels that detect no changes remain silent, while the ones that see a change in light intensity immediately send out the information. The Scaramuzza and Delbruck labs at the University of Zurich have pioneered the use of event cameras for autonomous drones, and Scaramuzza has demonstrated how they can be used to improve drone’s ability to avoid obstacles, or to fly even when one rotor is damaged.

Related publications

  • Falanga, K. Kleber, and D. Scaramuzza, “Dynamic Obstacle Avoidance for Quadrotors with Event Cameras”, Science Robotics, vol. 5, no. 40, eaaz9712, March 2020
  • N.J. Sanket, C.M Parameshwara, C.D. Singh, C. Fermüller, D. Scaramuzza, Y. Aloimonos, “EVDodgeNet: Deep Dynamic Obstacle Dodging with event cameras”, IEEE International Conference on Robotics and Automation (ICRA), 2020.
  • Rebecq, R. Ranftl, V. Koltun, D. Scaramuzza, “High Speed and High Dynamic Range Video with an Event Camera”, IEEE Transactions on Pattern Analysis and Machine Intelligence, June 2020.
  • Kaufmann, A. Loquercio, R. Ranftl, M. Müller, V. Koltun, D. Scaramuzza, “Deep Drone Acrobatics”, Robotics: Science and Systems (RSS), 2020.
  • Foehn, D. Brescianini, E. Kaufmann, T. Cieslewski, M. Gehrig, M. Muglikar, D. Scaramuzza, “AlphaPilot: Autonomous Drone Racing”, Robotics: Science and Systems (RSS), 2020.
  • Liu, W.T. Kao, T. Delbruck, “Live Demonstration: A Real-Time Event- Based Fast Corner Detection Demo Based on FPGA[C]”, IEEE Conference on Computer Vision and Pattern Recognition Workshops, Long Beach, 2019.
  • Hu, J. Binas, D. Neil, S.-C. Liu, T. Delbruck, “DDD20 End-to-End Event Camera Driving Dataset: Fusing Frames and Events with Deep Learning for Improved Steering Prediction” 23rd IEEE International Conference on Intelligent Transportation Systems (IEEE ITSC), 2020.
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