A folding robot weighing four grams that crawls and jumps

September 28, 2015, Ecole Polytechnique Federale de Lausanne
A folding robot weighing 4 grams that crawls and jumps
Two Tribots surrounding another type of robogami from the Reconfigurable Robotics Laboratory. Credit: Alain Herzog / EPFL

Researchers at EPFL have come up with a folding, reconfigurable robot that is capable of crawling and jumping. Modelled on the inchworm, it represents a new paradigm in robotics.

The word robot generally conjures up images of a rigid structure and electronic motors. In Jamie Paik's Reconfigurable Robotics Laboratory, however, the word takes on a whole new meaning. Researchers have thrown convention out the window by creating robots patterned on origami: flat, ultra-light and foldable.

 The most recent of these origami robots or "robogamis", Tribot, has been unveiled at the International Conference on Intelligent Robots and Systems (IROS). Tribot's gait pattern is modelled after inchworms, but what makes it unique is its gait mode: it can simultaneously switch between crawling and jumping, which means it can jump over obstacles and then resume moving forward. Tribot is two centimetres tall, weighs 4 grams and has a T-shaped structure with three legs. "This unusual robot can jump up to seven times its height, and it does not need to be reset between jumps," said Paik.

Intelligent motors actuated with heat

Creating a robot as light as a Swiss 20-centime coin was not easy for the team, which had to overcome several technical challenges. They could not use conventional motors, which are too heavy and bulky. All movement comes from a special kind of actuator and intelligent springs, which are made from shape memory alloy (SMA).

Shape memory alloy - in this case Titanium and Nickel - is capable of "remembering" its initial shape, even after it has been deformed. After deformation, it is possible to make it return to its basic shape by heating it at a certain temperature. Researchers used this principle to generate movement in their ultra light robot. They built actuators made of to allow locomotion in many directions. In short, movement is induced by thermally activating different parts of the robot.

"We gave the robot numerous actuators, each of which is insulated from the others," said Zhenishbek Zhakypov, who co-authored the article. "By activating the actuators successively, the robot begins to crawl. The jumping mode depends on springs that are also made out of SMA."

There are two ways to heat the actuators: by sending an electric current into the robot using wires, or with customized wireless micro-heaters.

As easy as building Ikea furniture

Tribot's sandwich-like structure could easily be produced on a mass scale. Several two-dimensional layers need to be assembled to create the three-legged . "Just like Ikea furniture, these robots could be shipped in flat layers that could then be easily assembled," said Paik. In their article, the researchers explain how Tribot can also be created with 3D printing, an extremely fast process.

Applications still to be determined

Unusual by any measure, Tribot - like the other robogamis - creates new perspectives in the field of robotics. Since it can switch modes of locomotion and adapt to the environment by reconfiguration, it could be used to move across rough terrain, for example.

For now, the researchers are continuing the work on their robogamis to give them additional sensors - such as accelerometers, and micro cameras - and having them interact with each other.

Explore further: Quadcopter and Quadruped story ends with smooth landing

More information: "A Fully Integrated Low-Profile Robotic Origami, in Journal Of Mechanisms And Robotics." Transactions Of The ASME, vol. 7, num. 2, 2015

Related Stories

Quadcopter and Quadruped story ends with smooth landing

September 22, 2015

An entertaining video is out showing a dog-like quadruped with a tethered quadcopter moving along as a twosome. Just a few seconds into this video would seemingly be enough to inspire any animation whiz kid to come up with ...

DALER project shows a walking flying robot (w/ Video)

August 4, 2013

(Phys.org) —At the Laboratory of Intelligent Systems we are developing a novel flying platform which has the ability to move on the ground by using its wings only. Using the wings as whegs to move on rough terrains instead ...

Self-folding robot walks, swims, climbs, dissolves

May 30, 2015

A demo sparking interest at the ICRA 2015 conference in Seattle was all about an origami robot that was worked on by researchers. More specifically, the team members are from the computer science and artificial intelligence ...

Jumping, roly-poly, untethered robot described

March 9, 2015

A novel, fully untethered soft robot capable of repeated jumping is able to cover half a meter in a single hop-and-roll motion. The innovative design of this combustion-powered robot, based on a roly-poly toy, and how it ...

Printed inchworm robot makes self-assembly moves (w/ Video)

May 9, 2013

(Phys.org) —A team from Harvard and MIT presented their work at the 2013 IEEE International Conference on Robotics and Automation (ICRA) in Germany. Their contribution: "Robot Self-Assembly by Folding: A Printed Inchworm ...

Recommended for you

Where is the universe hiding its missing mass?

February 15, 2019

Astronomers have spent decades looking for something that sounds like it would be hard to miss: about a third of the "normal" matter in the Universe. New results from NASA's Chandra X-ray Observatory may have helped them ...

What rising seas mean for local economies

February 15, 2019

Impacts from climate change are not always easy to see. But for many local businesses in coastal communities across the United States, the evidence is right outside their doors—or in their parking lots.


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.