Hosted by IDTechEx
Robotics Research
Tomorrow's technology, today's passion.
Direct from the experts at IDTechEx.
HomeEventsReportsAdvertiseTVCareersAbout UsSign-up or LoginIDTechExTwitterFacebookLinkedInGoogle+YoutubeRSSForward To Friend
Robotics Research
Posted on February 27, 2018

Snake-inspired robot uses kirigami to move

Structural Electronics 2018-2028
Who needs legs? With their sleek bodies, snakes can slither up to 14 miles-per-hour, squeeze into tight space, scale trees and swim. How do they do it? It's all in the scales. As a snake moves, its scales grip the ground and propel the body forward — similar to how crampons help hikers establish footholds in slippery ice. This so-called friction-assisted locomotion is possible because of the shape and positioning of snake scales. For more information see the IDTechEx report on new robotics.
 
Now, a team of researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) has developed a soft robot that uses those same principles of locomotion to crawl without any rigid components. The soft robotic scales are made using kirigami — an ancient Japanese paper craft that relies on cuts, rather than origami folds, to change the properties of a material. As the robot stretches, the flat kirigami surface is transformed into a 3D-textured surface, which grips the ground just like snake skin.
 
"There has been a lot of research in recent years into how to fabricate these kinds of morphable, stretchable structures," said Ahmad Rafsanjani, a postdoctoral fellow at SEAS and first author of the paper. "We have shown that kirigami principles can be integrated into soft robots to achieve locomotion in a way that is simpler, faster and cheaper than most previous techniques."
 
Electric Vehicles and Autonomous Vehicles in Minin
The researchers started with a simple, flat plastic sheet. Using a laser cutter, they embedded an array of centimeter-scale cuts, experimenting with different shapes and sizes. Once cut, the researchers wrapped the sheet around a tube-like elastomer actuator, which expands and contracts with air like a balloon.
 
When the actuator expands, the kirigami cuts pop-out, forming a rough surface that grips the ground. When the actuator deflates, the cuts fold flat, propelling the crawler forward.
 
The researchers built a fully untethered robot, with its integrated on-board control, sensing, actuation and power supply packed into a tiny tail. They tested it crawling throughout Harvard's campus.
 
The team experimented with various-shaped cuts, including triangular, circular and trapezoidal. They found that trapezoidal cuts — which most closely resemble the shape of snake scales —gave the robot a longer stride.
 
"We show that the locomotive properties of these kirigami-skins can be harnessed by properly balancing the cut geometry and the actuation protocol," said Rafsanjani. "Moving forward, these components can be further optimized to improve the response of the system."
 
"We believe that our kirigami-based strategy opens avenues for the design of a new class of soft crawlers," said Katia Bertoldi, the William and Ami Kuan Danoff Professor of Applied Mechanics and senior author of the paper. "These all-terrain soft robots could one day travel across difficult environments for exploration, inspection, monitoring and search and rescue missions or perform complex, laparoscopic medical procedures."
 
 
New Robotics and Drones 2018-2038
Source and top image: Harvard University
Learn more at the next leading event on the topic: Sensors USA 2018 External Link on 14 - 15 Nov 2018 at Santa Clara Convention Center, CA, USA hosted by IDTechEx.