Duke University's 'Argus' Robot Achieves Omnidirectional Movement

Duke University is developing a robot named Argus that can move in any direction instantly, abandoning the idea of mimicking natural shapes. Mechanical engineering and materials science assistant professor Boyuan Chen and his team focused on consistency of motion, which they call "dynamic symmetry," rather than trying to replicate the symmetrical forms of nature like humans, dogs, or insects.

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We're not measuring how your legs are arranged around different parts of your body, but how fast you can move in any direction. Who says if we want a robot that can help us in the most efficient way, it has to look like us?

The spherical robot, named after the mythical hundred-eyed giant, has a central core with 20 extendable legs equipped with depth-sensing cameras. Because it lacks a distinct front, back, top, or bottom, Argus can move in any direction instantaneously. "We're not measuring how your legs are arranged around different parts of your body, but how fast you can move in any direction," Chen explained. "Who says if we want a robot that can help us in the most efficient way, it has to look like us?"

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Watching Argus move is unlike any other robot we've studied. When we first saw it navigating through the woods and rough terrain, and it was fine even after severe collisions, we knew it was extraordinary.

In experiments, Argus successfully navigated sandy beaches and forest underbrush, climbed over obstacles, and stabilized itself after being pushed. It can use its legs to alternate between supporting and pushing, even climbing between parallel brick walls. The robot can continue operating even if one or more motors fail or a leg breaks. "Watching Argus move is unlike any other robot we've studied," said graduate student and co-author Jiaxun Liu. "When we first saw it navigating through the woods and rough terrain, and it was fine even after severe collisions, we knew it was extraordinary."

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Instead of building a robotic hand that looks like a human hand... one idea is to make Argus itself that hand, and it can manipulate objects in any direction.

The research, published online in "Science Robotics," introduces a new design principle called "dynamic isotropy." This principle scores robots on a scale of 0 to 1 based on how uniformly they can accelerate in all directions. Most current robots, including humanoids and drones, score below 0.6, while Argus achieved a score of 0.91. Chen hopes to apply this principle to develop robots for search and rescue, underwater or aerial vehicles, or manipulators capable of grasping objects. "Instead of building a robotic hand that looks like a human hand... one idea is to make Argus itself that hand, and it can manipulate objects in any direction," he said. "The knowledge we can transmit to the rest of the world is far more profound than building existing robots or replicating existing species."

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The knowledge we can transmit to the rest of the world is far more profound than building existing robots or replicating existing species.