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Reconfigurable Robot Can Climb Up Its Own Track

The minimalist robotic tank can build its own track up into the air as it drives

2 min read
Reconfigurable Robot Can Climb Up Its Own Track
Image: Ben Gurion University

David Zarrouk’s lab at Ben Gurion University, in Israel, is well known for developing creative, highly mobile robots that use a minimal number of actuators. Their latest robot is called RCTR (Reconfigurable Continuous Track Robot), and it manages to change its entire body shape on a link-by-link basis, using just one extra actuator to “build its own track in the air as it advances.”

The concept behind this robot is similar to Zarrouk’s reconfigurable robotic arm, which we wrote about a few years ago. That arm is made up of a bunch of links that are attached to each other through passive joints, and a little robotic module can travel across those links and adjust the angle of each joint separately to reconfigure the arm. 

Reconfigurable crawler robotThe robot’s locking mechanism (located in the front of the robot’s body) can lock the track links at a 20° angle (A) or a straight angle (B), or it can keep the track links unlocked (C).Image: Ben Gurion University

RCTR takes this idea and flips it around, so that instead of an actuator moving along a bunch of flexible links, you have a bunch of flexible links (the track) moving across an actuator. Each link in the track has a locking pin, and depending on what the actuator is set to when that link moves across it, the locking pin can be engaged such that the following link gets fixed at a relative angle of either zero degrees or 20 degrees. It’s this ability to lock the links of the track—turning the robot from flexible to stiff—that allows RCTR to rear up to pass over an obstacle, and do the other stuff that you can see in the video. And to keep the robot from fighting against its own tracks, the rear of the robot has a passive system that disengages the locking pins on every link to reset the flexibility of the track as it passes over the top. 

The biggest downside to this robot is that it’s not able to, uh, steer. Adding steering wouldn’t be particularly difficult, although it would mean a hardware redesign: the simplest solution is likely to do what most other tracked vehicles do, and use a pair of tracks and skid-steering, although you could also attach two modules front to back with a powered hinge between them. The researchers are also working on a locomotion planning algorithm for handling a variety of terrain, presumably by working out the best combination of rigid and flexible links to apply to different obstacles.

“A Minimally Actuated Reconfigurable Continuous Track Robot,” by Tal Kislassi and David Zarrouk from Ben Gurion University in Israel, is published in IEEE Robotics and Automation Letters.

[ RA-L ] via [ BGU ]

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The Bionic-Hand Arms Race

The prosthetics industry is too focused on high-tech limbs that are complicated, costly, and often impractical

12 min read
A photograph of a young woman with brown eyes and neck length hair dyed rose gold sits at a white table. In one hand she holds a carbon fiber robotic arm and hand. Her other arm ends near her elbow. Her short sleeve shirt has a pattern on it of illustrated hands.

The author, Britt Young, holding her Ottobock bebionic bionic arm.

Gabriela Hasbun. Makeup: Maria Nguyen for MAC cosmetics; Hair: Joan Laqui for Living Proof

In Jules Verne’s 1865 novel From the Earth to the Moon, members of the fictitious Baltimore Gun Club, all disabled Civil War veterans, restlessly search for a new enemy to conquer. They had spent the war innovating new, deadlier weaponry. By the war’s end, with “not quite one arm between four persons, and exactly two legs between six,” these self-taught amputee-weaponsmiths decide to repurpose their skills toward a new projectile: a rocket ship.

The story of the Baltimore Gun Club propelling themselves to the moon is about the extraordinary masculine power of the veteran, who doesn’t simply “overcome” his disability; he derives power and ambition from it. Their “crutches, wooden legs, artificial arms, steel hooks, caoutchouc [rubber] jaws, silver craniums [and] platinum noses” don’t play leading roles in their personalities—they are merely tools on their bodies. These piecemeal men are unlikely crusaders of invention with an even more unlikely mission. And yet who better to design the next great leap in technology than men remade by technology themselves?

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