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Drones & Air Taxis Technology

Researchers develop flying robots with flapping wings 

Ben SampsonBy Ben Sampson3rd February 20222 Mins Read
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Flapping wings
The LAZA (Liquid-amplified Zipping Actuator) simplifies the mechanism needed to make insect-like wings flap (Image: University of Bristol)

Flapping wing autonomous robots that use a new method of electromechanical zipping that eliminates the need for conventional motors and gears has been developed by researchers in the UK.

The team at the University of Bristol believe that the zipping technology will enable smaller, lighter and more effective micro flying robots to be developed and used in applications such as environmental monitoring, search and rescue, and deployment in hazardous environments.

Existing micro flying robots have used motors, gears and other complex transmission systems to achieve the up-and-down motion of the wings. This has added complexity, weight and undesired dynamic effects.

Taking inspiration from bees and other flying insects, researchers from Bristol’s Faculty of Engineering, led by Professor of Robotics Jonathan Rossiter, successfully demonstrated a direct-drive artificial muscle system, called the Liquid-amplified Zipping Actuator (LAZA), that achieves wing motion using no rotating parts or gears.

The LAZA system simplifies the flapping mechanism, enabling future miniaturization of flapping robots down to the size of insects.

In a research paper published this week the team show how a pair of LAZA-powered flapping wings can provide more power compared with insect muscle of the same weight, enough to fly a robot across a room at 18 body lengths per second.

Image: University of Bristol

They also demonstrated how the LAZA can deliver consistent flapping over more than one million cycles, important for making flapping robots that can undertake long-haul flights.

The team believe the LAZA to be adopted as a fundamental building block for a range of autonomous insect-like flying robots.

Dr Tim Helps, lead author and developer of the LAZA system said, “With the LAZA we apply electrostatic forces directly on the wing, rather than through a complex, inefficient transmission system. This leads to better performance, simpler design, and will unlock a new class of low-cost, lightweight flapping micro-air vehicles for future applications, like autonomous inspection of off-shore wind turbines.”

Professor Rossiter added, “Making smaller and better performing flapping wing micro robots is a huge challenge. LAZA is an important step toward autonomous flying robots that could be as small as insects and perform environmentally critical tasks such as plant pollination and exciting emerging roles such as finding people in collapsed buildings.”

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Ben Sampson

Ben has worked as a journalist and editor, covering technology, engineering and industry for the last 20 years. Initially writing about subjects from nuclear submarines to autonomous cars to future design and manufacturing technologies, he was editor of a leading UK-based engineering magazine before becoming editor of Aerospace Testing in 2017.

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