By Caroline Brogan
Imperial researchers have created drones that can attach sensors to trees to monitor environmental and ecological changes in forests.
Sensors for forest monitoring are already used to track changes in temperature, humidity and light, as well as the movements of animals and insects through their habitat. They also help to detect and monitor forest fires and can provide valuable data on how climate change and other human activities are impacting the natural world.
However, placing these sensors can prove difficult in large, tall forests, and climbing trees to place them poses its own risks.
Now, researchers at Imperial College London’s Aerial Robotics Lab have developed drones that can shoot sensor-containing darts onto trees several metres away in cluttered environments like forests. The drones can also place sensors through contact or by perching on tree branches.
Via GIPHY. Credit: Imperial College London
I like to think of them as artificial forest inhabitants who will soon watch over the ecosystem and provide the data we need to protect the environment.
Professor Mirko Kovac, Department of Aeronautics
The researchers hope the drones will be used in future to create networks of sensors to boost data on forest ecosystems, and to track hard-to-navigate biomes like the Amazon rainforest.
Lead researcher Professor Mirko Kovac, Director of the Aerial Robotics Lab from the Department of Aeronautics at Imperial said: “Monitoring forest ecosystems can be difficult, but our drones could deploy whole networks of sensors to boost the amount and precision of environmental and ecological data.
“I like to think of them as artificial forest inhabitants who will soon watch over the ecosystem and provide the data we need to protect the environment.”
The drones are equipped with cameras to help identify suitable targets, and a smart material that changes shape when heated to launch the darts, which then stick to the trees. They can also perch on tree branches like birds to collect data themselves, acting as mobile sensors.
The researchers have tested their drones at the Swiss Federal Laboratories for Materials Science and Technology (EMPA) and on trees at Imperial’s Silwood Park Campus.
Via GIPHY. Credit: Imperial College London
We aim to introduce new design and control strategies to allow drones to effectively operate in forested environments.
Dr Salua Hamaza, Department of Aeronautics
The drones are currently controlled by people: using control units, the researchers watch through the camera lens to select target trees and shoot the darts. The next step is to make the drones autonomous, so that researchers can test how they fare in denser forest environments without human guidance.
Co-author André Farhina, of the Department of Aeronautics, said: “There are plenty of challenges to be addressed before the drones can be regularly used in forests, like achieving a careful balance between human input and automated tasks so that they can be used safely while remaining adaptable to unpredictable environments.”
Co-author Dr Salua Hamaza, also of the Department of Aeronautics, said: “We aim to introduce new design and control strategies to allow drones to effectively operate in forested environments. Exploiting smart mechanisms and new sensing techniques we can off-load the on-board computation, and create platforms that are energy-efficient and better performing.”
These works were funded by the EPSRC, ORCA Robotics Hub, EU Horizon 2020, NERC (QMEE CDT), UKAEA with RACE and the Royal Society.
In this episode, Lilly interviews Jonathan Sauder, the Principal Investigator of a NASA Innovative Advanced Concepts project to design a rover for the surface of Venus. Sauder explains why exploring Venus is important and why previous surface missions have only lasted a few hours. They discuss his innovative wheeled-robot concept, a hybrid automaton rover which would be mostly mechanical and powered by wind.
Jonathan Sauder
Jonathan Sauder is a NASA Innovative Advanced Concepts (NIAC) Fellow and Senior Mechatronics Engineer at NASA Jet Propulsion Lab in the Technology Infusion Group focused on innovative concepts. He is also a lecturer of “Design Theory and Methodology” and “Advanced Mechanical Design” at the University of Southern California, where he received his PhD in Mechanical Engineering.
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By Nicola Nosengo
NCCR Robotics researchers at EPFL have developed a drone with a feathered wing and tail that give it unprecedented flight agility.
The northern goshawk is a fast, powerful raptor that flies effortlessly through forests. This bird was the design inspiration for the next-generation drone developed by scientists of the Laboratory of Intelligent Systems of EPFL led by Dario Floreano. They carefully studied the shape of the bird’s wings and tail and its flight behavior, and used that information to develop a drone with similar characteristics.
“Goshawks move their wings and tails in tandem to carry out the desired motion, whether it is rapid changes of direction when hunting in forests, fast flight when chasing prey in the open terrain, or when efficiently gliding to save energy,” says Enrico Ajanic, the first author and PhD student in Floreano’s lab. Floreano adds: “our design extracts principles of avian agile flight to create a drone that can approximate the flight performance of raptors, but also tests the biological hypothesis that a morphing tail plays an important role in achieving faster turns, decelerations, and even slow flight.”
The engineers already designed a bird-inspired drone with morphing wing back in 2016. In a step forward, their new model can adjust the shape of its wing and tail thanks to its artificial feathers. “It was fairly complicated to design and build these mechanisms, but we were able to improve the wing so that it behaves more like that of a goshawk,” says Ajanic. “Now that the drone includes a feathered tail that morphs in synergy with the wing, it delivers unparalleled agility.” 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. It uses a propeller for forward thrust instead of flapping wings because it is more efficient and makes the new wing and tail system applicable to other winged drones and airplanes.
The advantage of winged drones over quadrotor designs is that they have a longer flight time for the same weight. However, quadrotors tend to have greater dexterity, as they can hover in place and make sharp turns. “The drone we just developed is somewhere in the middle. It can fly for a long time yet is almost as agile as quadrotors,” says Floreano. This combination of features is especially useful for flying in forests or in cities between buildings, as it can be necessary during rescue operation. The project is part of the Rescue Robotics Grand Challenge of NCCR Robotics.
Flying this new type of drone isn’t easy, due to the large number of wing and tail configurations possible. To take full advantage of the drone’s flight capabilities, Floreano’s team plans to incorporate artificial intelligence into the drone’s flight system so that it can fly semi-automatically. The team’s research has been published in Science Robotics.