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 robot The 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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Robot with threads near a fallen branch

RoMan, the Army Research Laboratory's robotic manipulator, considers the best way to grasp and move a tree branch at the Adelphi Laboratory Center, in Maryland.

Evan Ackerman

This article is part of our special report on AI, “The Great AI Reckoning.

"I should probably not be standing this close," I think to myself, as the robot slowly approaches a large tree branch on the floor in front of me. It's not the size of the branch that makes me nervous—it's that the robot is operating autonomously, and that while I know what it's supposed to do, I'm not entirely sure what it will do. If everything works the way the roboticists at the U.S. Army Research Laboratory (ARL) in Adelphi, Md., expect, the robot will identify the branch, grasp it, and drag it out of the way. These folks know what they're doing, but I've spent enough time around robots that I take a small step backwards anyway.

The robot, named RoMan, for Robotic Manipulator, is about the size of a large lawn mower, with a tracked base that helps it handle most kinds of terrain. At the front, it has a squat torso equipped with cameras and depth sensors, as well as a pair of arms that were harvested from a prototype disaster-response robot originally developed at NASA's Jet Propulsion Laboratory for a DARPA robotics competition. RoMan's job today is roadway clearing, a multistep task that ARL wants the robot to complete as autonomously as possible. Instead of instructing the robot to grasp specific objects in specific ways and move them to specific places, the operators tell RoMan to "go clear a path." It's then up to the robot to make all the decisions necessary to achieve that objective.

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