There are no garbage trucks equipped to leave the atmosphere and pick up debris floating around the Earth. But what if we could send a robot to do the job?
Scientists at NASA’s Jet Propulsion Laboratory in Pasadena, California, are working on adhesive gripping tools that could grapple objects such as orbital debris or defunct satellites that would otherwise be hard to handle.
The gecko gripper project was selected for a test flight through the Flight Opportunities Program of NASA’s Space Technology Mission Directorate. As a test, researchers used the grippers in brief periods of weightlessness aboard NASA’s C-9B parabolic flight aircraft in August.
“Orbital debris is a serious risk to spacecraft, including the International Space Station,” said Aaron Parness, a JPL robotics researcher who is the principal investigator for the grippers. “This is definitely a problem we’re going to have to deal with. Our system might one day contribute to a solution.”
The gripping system developed by Parness and colleagues was inspired by geckos, lizards that cling to walls with ease. Geckos’ feet have branching arrays of tiny hairs, the smallest of which are hundreds of times thinner than a human hair. This system of hairs can conform to a rough surface without a lot of force. Although researchers cannot make a perfect replica of the gecko foot, they have put “hair” structures on the adhesive pads of the grippers.
The synthetic hairs, also called stalks, are wedge-shaped and have a slanted, mushroom-shaped cap. When the gripping pad lightly touches part of an object, only the very tips of the hairs make contact with that surface.
“The stickiness of the grippers can be turned on and off, by changing the direction in which you pull the hairs,” Parness said.
To get the gripper to stick to a surface, force is applied to the adhesive pad material in a manner that makes the hairs bend. This increases the real area of contact between the hairs and the surface, which corresponds to greater adhesion. When the force is relaxed and the hairs go back to being upright, this process turns off the stickiness.
A phenomenon called van der Waals forces, named for Nobel Prize-winning physicist Johannes Diderik van der Waals, explains the non-permanent stickiness of the grippers, as well as gecko feet. These temporary adhesive forces happen because electrons orbiting the nuclei of atoms are not evenly spaced, creating a slight electrical charge. Such forces persist even in extreme temperature, pressure and radiation conditions.
“The reliability of van der Waals forces, even in severe environments, makes them particularly useful for space applications,” Parness said.
“The system could grapple objects in space that are spinning or tumbling, and would otherwise be hard to target,” he said.
The Latest on: Gecko Grippers
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The Latest on: Gecko Grippers
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- OnRobot Sets Up Office In Los Angeleson July 31, 2019 at 5:31 am
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- Gecko-like gripper could clean up space junkon June 28, 2019 at 5:00 pm
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- Gecko Gripper utilizing NASA-created tech launches commerciallyon February 4, 2019 at 5:37 am
A robotic gripper inspired by the adhesive properties of gecko hands will soon be adorning robots around the world. We've written about OnRobot's Gecko Gripper before, but its commercial availability ...
- OnRobot Announces Availability of Gecko Gripper Built with NASA-Inspired Techon January 21, 2019 at 8:35 am
OnRobot, a company focused in end-of-arm tooling for collaborative robots, is kicking of 2019 with its newly-available Gecko Gripper, that uses millions of micro-scaled fibrillar stalks that adhere to ...
- Rocket Science Comes to ATX West as OnRobot Announces General Availability of Gecko Gripper Built With NASA-created Technologyon January 17, 2019 at 10:35 am
OnRobot kicked off the new year by shipping pre-orders of its newly-available Gecko Gripper, that uses millions of micro-scaled fibrillar stalks that adhere to a surface using powerful van der Waals ...
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