A 34 centimeter diameter spherical flying robot does things that probably don't make sense to most people.
Rather than avoiding obstacles, it bumps into and then ricochets off of them - its world is one of unpredictable, chaotic environments, it don't need no stinking fragile detection sensors sensors. Named Gimball, it is more like an insect than the 'gimbal' you are used to, which is an axis that allows objects to pivot, like a gyroscope or a drink holder that keeps things from getting all messy. Yet like those devices, it keeps its balance using a gyroscopic stabilization system. When tested in the forests above Lausanne, Switzerland, it performed brilliantly, careening from tree trunk to tree trunk but staying on course. It will be presented in public at the IREX conference in Tokyo, Japan next week.
Gimball is powered by twin propellers and steered by fins and can stay on course despite its numerous collisions- a formidable challenge.
Przemyslaw Mariusz Kornatowski (left) and Adrien Briod (right) hold the Gimball. Credit: EPFL / Alain Herzog
"The idea was for the robot's body to stay balanced after a collision, so that it can keep to its trajectory," explains Ecole Polytechnique Fédérale de Lausanne PhD student Adrien Briod. "Its predecessors, which weren't stabilized, tended to take off in random directions after impact."
With colleague Przemyslaw Mariusz Kornatowski, Briod developed the gyroscopic stabilization system consisting of a double carbon-fiber ring that keeps the robot oriented vertically, while the cage absorbs shocks as it rotates.
Going sensor-free: insect-inspired design
Most robots navigate using a complex network of sensors, which allow them to avoid obstacles by reconstructing the environment around them. It's an inconvenient method, says Briod. "The sensors are heavy and fragile. And they can't operate in certain conditions, for example if the environment is full of smoke."
Gimball's robustness lies in its technological simplicity, says Briod. "Flying insects handle collisions quite well. For them, shocks aren't really accidents, because they're designed to bounce back from them. This is the direction we decided to take in our research."
Navigating chaotic environments
The flying robot is prepared to deal with the most difficult terrain out there. "Our objective was exactly that – to be able to operate where other robots can't go, such as a building that has collapsed in an earthquake. The on-board camera can provide valuable information to emergency personnel." The scientist had an opportunity to test his prototype in a Swiss pine forest. Fitted out with just a compass and an altitude sensor, Gimball demonstrated its ability to maintain its course over several hundred meters despite colliding with several tree trunks along the way.
Gimball is the latest in a long line of colliding robots developed in the laboratory of EPFL professor Dario Floreano. But its stabilization system, spherical shape and ultralight weight – barely 370 grams – demonstrate the potential of the concept better than ever before. "The mechanics must also be intelligent, since complex obstacle avoidance systems are not sufficient," says Briod. Even so, he insists, "we're not yet ready to compete with our model. Insects are still superior."
Source: Ecole Polytechnique Fédérale de Lausanne