Bird robot shows how flying machines could one day move better on the ground

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© 2024 EPFL/Alain Herzog (CC-BY-SA 4.0)
© 2024 EPFL/Alain Herzog (CC-BY-SA 4.0)

International researchers have built a robot with legs inspired by birds to allow it to both walk and fly, a concept they say could one day make larger flying machines more versatile once they hit the ground. The robot, named RAVEN, has legs that can jump, walk and hop but is a simple enough mechanism to be light enough to allow flight, something the researchers say has so far been difficult to achieve. The researchers say their system needs more work but it could one day inspire machines that can handle more versatile terrains.

Media release

From: Springer Nature

Engineering: Bird-inspired leg helps robots to jump into flight

RAVEN, a robot with bird-inspired legs can jump into flight, walk on the ground and hop over obstacles. The design, described in Nature this week, could enable the deployment of aircraft in complex terrains.

The hindlimbs of birds have a range of functions, such as walking, hopping, leaping, and jumping take-off into flight. These capabilities could be useful for aerial robots, but building systems with multiple modes of locomotion is challenging as the systems can become too mechanically complex or heavy to fly properly.

Won Dong Shin and colleagues overcome these challenges to develop RAVEN (Robotic Avian-inspired Vehicle for multiple ENvironments), a robot with limbs that can move like those of a bird. The limbs have structures that mimic a hip, ankle and foot, although the design is not as complex as the multisegmented leg anatomy seen in birds. RAVEN can jump into take off, just like a bird, and this is shown to contribute substantially to initial flight take-off speed and is more energy efficient than taking off without a jump. The leg design also enables a range of locomotion gaits such as walking, hopping over a gap, and jumping onto an obstacle.

Although further optimization of the system is needed, the leg design in RAVEN could inspire the design of more versatile machines that can use multiple locomotion modes, the authors conclude.

Multimedia

RAVEN
RAVEN
RAVEN
RAVEN
Jumping take-off
Jumping take-off
Walking comparisons
Comparison between RAVEN and birds

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Research Springer Nature, Web page The URL will go live after the embargo ends
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conference:
Nature
Research:Paper
Organisation/s: École Polytechnique Fédérale de Lausanne, Switzerland
Funder: This work was supported in part by the NCCR Robotics, a National Centre of Competence in Research, funded by the Swiss National Science Foundation under grant 51NF40_185543 and in part by the European Union’s Horizon 2020 research and innovation programme under grant 871479 AERIAL-CORE.
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