Robo Raven........
A robotic bird created in conjunction with U.S. Army could be developed into an unsuspecting future war agent.The Robo-Raven's manoeuvres are so realistic that other birds are fooled into thinking it is one of them.Its ability to hide in plain sight and light weight could prove valuable in military operations, claim Army Research Laboratory researchers. It weighs just 9.7 grams and has a wingspan of 34.3 cm.
'It already attracts attention from birds in the area which tends to hide its presence,' said John Gerdes, a mechanical engineer at Aberdeen Proving Ground.Seagulls, songbirds and sometimes crows tend to try to fly in a formation near the bird during testing, but birds of prey, like falcons and hawks take a much more aggressive approach.
'Generally we don't see them coming,' Gerdes said. 'They will dive and attack by hitting the bird from above with their talons, then they typically fly away.’Scientists at the University of Maryland made Robo-Raven out of carbon fibre, thermal-resistant plastic, Mylar foil and foam.
It has the unique ability to flap its wings completely independently of each other, enabling the bird to perform extreme aerobatic manoeuvres.Using two actuators for the wings required a bigger battery and an on-board micro controller, which initially made Robo-Raven too heavy to fly.To reduce the weight, engineers turned to advanced manufacturing processes such as 3D printing and laser cutting.The system now weighs just 9.7 grams and has a wing span of 34.3cm. It can carry a payload of almost six grams.The system is much quieter than the helicopter or propeller and can get much closer to an adversary without revealing its presence.
'We use hollow stiffeners to provide a stiff and light-weight structure, and our wing spars have been arranged in a fan pattern to create the desired airfoil shape during the flapping motions,' said Gerdes.
'At any time, we can transition between these behaviours with total control over the wings.'Robo-Raven’s aerobatics could someday prove vital in stealth reconnaissance and surveillance missions.Its potential has been recognised by the U.S Army who is funding research into small and micro scale unmanned aerial systems that could allow Robo-Raven to fly autonomously.Currently Robo-Raven cannot fly with sensors due to a very restricted payload, but advanced research is expected to improve their understanding of how a soldier could use it.
The team at Maryland University are also working on developing solar cell wings so that the Robo-Raven can land and charge before resuming a mission.The project builds on work by Dr SK Gupta, a professor in mechanical engineering at Maryland University, who began working on flapping-wing robotic birds nearly a decade ago.upta first successfully demonstrated a flapping-wing bird in 2007. This bird used one motor to flap both wings together in simple motions.
By 2010 the design had evolved over four successive models. The final bird in the series was able to carry a tiny video camera, could be launched from a ground robot, and could fly in winds up to 10 mph.‘Robotic birds are expected to offer advances in many different applications such as agriculture, surveillance, and environmental monitoring,’ said Gupta.‘Robo-Raven is just the beginning. Many exciting developments lie ahead. The exotic bird that you might spot in your next trip to Hawaii might actually be a robot.’
'It already attracts attention from birds in the area which tends to hide its presence,' said John Gerdes, a mechanical engineer at Aberdeen Proving Ground.Seagulls, songbirds and sometimes crows tend to try to fly in a formation near the bird during testing, but birds of prey, like falcons and hawks take a much more aggressive approach.
'Generally we don't see them coming,' Gerdes said. 'They will dive and attack by hitting the bird from above with their talons, then they typically fly away.’Scientists at the University of Maryland made Robo-Raven out of carbon fibre, thermal-resistant plastic, Mylar foil and foam.
It has the unique ability to flap its wings completely independently of each other, enabling the bird to perform extreme aerobatic manoeuvres.Using two actuators for the wings required a bigger battery and an on-board micro controller, which initially made Robo-Raven too heavy to fly.To reduce the weight, engineers turned to advanced manufacturing processes such as 3D printing and laser cutting.The system now weighs just 9.7 grams and has a wing span of 34.3cm. It can carry a payload of almost six grams.The system is much quieter than the helicopter or propeller and can get much closer to an adversary without revealing its presence.
'We use hollow stiffeners to provide a stiff and light-weight structure, and our wing spars have been arranged in a fan pattern to create the desired airfoil shape during the flapping motions,' said Gerdes.
'At any time, we can transition between these behaviours with total control over the wings.'Robo-Raven’s aerobatics could someday prove vital in stealth reconnaissance and surveillance missions.Its potential has been recognised by the U.S Army who is funding research into small and micro scale unmanned aerial systems that could allow Robo-Raven to fly autonomously.Currently Robo-Raven cannot fly with sensors due to a very restricted payload, but advanced research is expected to improve their understanding of how a soldier could use it.
The team at Maryland University are also working on developing solar cell wings so that the Robo-Raven can land and charge before resuming a mission.The project builds on work by Dr SK Gupta, a professor in mechanical engineering at Maryland University, who began working on flapping-wing robotic birds nearly a decade ago.upta first successfully demonstrated a flapping-wing bird in 2007. This bird used one motor to flap both wings together in simple motions.
By 2010 the design had evolved over four successive models. The final bird in the series was able to carry a tiny video camera, could be launched from a ground robot, and could fly in winds up to 10 mph.‘Robotic birds are expected to offer advances in many different applications such as agriculture, surveillance, and environmental monitoring,’ said Gupta.‘Robo-Raven is just the beginning. Many exciting developments lie ahead. The exotic bird that you might spot in your next trip to Hawaii might actually be a robot.’
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