A Robotic Ape on the Tundra
Ice Worm isn’t the only approach being developed for icy worlds like Saturn’s moon Enceladus, where geysers at the south pole blast liquid into space. A rover in this unpredictable world would need to be able to move on ice and silty, crumbling ground. RoboSimian is being developed to meet that challenge.
Originally built as a disaster-relief robot for the Defense Advanced Research Projects Agency (DARPA), it has been modified to move in icy environments. Nicknamed “King Louie” after the character in “The Jungle Book,” RoboSimian can walk on four legs, crawl, move like an inchworm and slide on its belly like a penguin. It has the same four limbs as LEMUR, but JPL engineers replaced its gripping feet with springy wheels made from music wire (the kind of wire found in a piano). Flexible wheels help King Louie roll over uneven ground, which would be essential in a place like Enceladus.
Tiny Climbers
Micro-climbers are wheeled vehicles small enough to fit in a coat pocket but strong enough to scale walls and survive falls up to 9 feet (3 meters). Developed by JPL for the military, some micro-climbers use LEMUR’s fishhook grippers to cling to rough surfaces, like boulders and cave walls. Others can scale smooth surfaces, using technology inspired by a gecko’s sticky feet. The gecko adhesive, like the lizard it’s named for, relies on microscopic angled hairs that generate van der Waals forces – atomic forces that cause “stickiness” if both objects are in close proximity.
Enhancing this gecko-like stickiness, the robots’ hybrid wheels also use an electrical charge to cling to walls (the same phenomenon makes your hair stick to a balloon after you rub it on your head). JPL engineers created the gecko adhesive for the first generation of LEMUR, using van der Waals forces to help it cling to metal walls, even in zero gravity. Micro-climbers with this adhesive or gripping technology could repair future spacecraft or explore hard-to-reach spots on the Moon, Mars and beyond.
Ocean to Asteroid Grippers
Just as astronauts train underwater for spacewalks, technology built for ocean exploration can be a good prototype for missions to places with nearly zero gravity. The Underwater Gripper is one of the gripping hands from LEMUR, with the same 16 fingers and 250 fishhooks for grasping irregular surfaces. It could one day be sent for operations on an asteroid or other small body in the solar system. For now, it’s attached to the underwater research vessel Nautilus operated by the Ocean Exploration Trust off the coast of Hawaii, where it helps take deep ocean samples from more than a mile below the surface.
A Cliff-Climbing Mini-Helicopter
The small, solar-powered helicopter accompanying NASA’s Mars 2020 rover will fly in short bursts as a technology demonstration, paving the way for future flying missions at the Red Planet. But JPL engineer Arash Kalantari isn’t content to simply fly; he’s developing a concept for a gripper that could allow a flying robot to cling to Martian cliffsides. The perching mechanism is adapted from LEMUR’s design: It has clawed feet with embedded fishhooks that grip rock much like a bird clings to a branch. While there, the robot would recharge its batteries via solar panels, giving it the freedom to roam and search for evidence of life.