Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Thermal-Powered, Insectlike Robot Crawls Into Microrobot Contenders’ Ring

05.07.2010
Robotic cars attracted attention last decade with a 100-mile driverless race across the desert competing for a $1 million prize put up by the U.S. government.

The past few years have given rise to a growing number of microrobots, miniaturized mobile machines designed to perform specific tasks. And though spectators might need magnifying glasses to see the action, some think the time has come for a microrobotics challenge.

“I’d like to see a similar competition at the small scale, where we dump these microrobots from a plane and have them go off and run for days and just do what they’ve been told,” said Karl Böhringer, a University of Washington professor of electrical engineering. “That would require quite an effort at this point, but I think it would be a great thing.”

Researchers at the UW and Stanford University have developed what might one day be a pint-sized contender. Böhringer is lead author of a paper in the June issue of the Journal of Microelectromechanical Systems introducing an insectlike robot with hundreds of tiny legs.

Compared to other such robots, the UW model excels in its ability to carry heavy loads – more than seven times its own weight – and move in any direction.

Someday, tiny mobile devices could crawl through cracks to explore collapsed structures, collect environmental samples or do other tasks where small size is a benefit. The UW’s robot weighs half a gram (roughly one-hundredth of an ounce), measures about 1 inch long by a third of an inch wide, and is about the thickness of a fingernail.

Technically it is a centipede, with 512 feet arranged in 128 sets of four. Each foot consists of an electrical wire sandwiched between two different materials, one of which expands under heat more than the other. A current traveling through the wire heats the two materials and one side expands, making the foot curl. Rows of feet shuffle along in this way at 20 to 30 times each second.

“The response time is an interesting point about these tiny devices,” Böhringer said. “On your stove, it might take minutes or even tens of minutes to heat something up. But on the small scale it happens much, much faster.”

The legs’ surface area is so large compared to their volume that they can heat up or cool down in just 20 milliseconds.

“It’s one of the strongest actuators that you can get at the small scale, and it has one of the largest ranges of motion,” Böhringer said. “That’s difficult to achieve at the small scale.”

The microchip, the robot’s body and feet, was first built in the mid 1990s at Stanford University as a prototype for part of a paper-thin scanner or printer. A few years later the researchers modified it as a docking system for space satellites. Now they have flipped it over so the structures that acted like moving cilia are on the bottom, turning the chip into an insectlike robot.

“There were questions about the strength of the actuators. Will they be able to support the weight of the device?” Böhringer said. “We were surprised how strong they were. For these things that look fragile, it’s quite amazing.”

The tiny legs can move more than just the device. Researchers were able to pile paper clips onto the robot’s back until it was carrying more than seven times its own weight. This means that the robot could carry a battery and a circuit board, which would make it fully independent. (It now attaches to nine threadlike wires that transmit power and instructions.)

Limbs pointing in four directions allow the robot flexibility of movement.
“If you drive a car and you want to be able to park it in a tight spot, you think, ‘Wouldn’t it be nice if I could drive in sideways,’” Böhringer said. “Our robot can do that – there’s no preferred direction.”

Maneuverability is important for a robot intended to go into tight spaces.

The chip was not designed to be a microrobot, so little effort was made to minimize its weight or energy consumption. Modifications could probably take off 90 percent of the robot’s weight, Böhringer said, and eliminate a significant fraction of its power needs.

As with other devices of this type, he added, a major challenge is the power supply. A battery would only let the robot run for 10 minutes, while researchers would like it to go for days.

Another is speed. Right now the UW robot moves at about 3 feet per hour – and it’s far from the slowest in the microrobot pack.

Co-authors are former UW graduate students Yegan Erdem, Yu-Ming Chen and Matthew Mohebbi; UW electrical engineering professor Robert Darling; John Suh at General Motors; and Gregory Kovacs at Stanford.

Research funding was provided by the U.S. Defense Advanced Research Projects Agency, the National Science Foundation and General Motors Co.

For more information, contact Böhringer at 206-221-5177 or karl@ee.washington.edu.

More information on the research is at www.tinyurl.com/uw_microrobot.

The article includes a table comparing published data on 10 microrobots.

Hannah Hickey | Newswise Science News
Further information:
http://www.uw.edu

More articles from Interdisciplinary Research:

nachricht Stealth Virus for Cancer Therapy
31.01.2018 | Universität Zürich

nachricht New formulas for exploring the age structure of non-linear dynamical systems
23.01.2018 | Max-Planck-Institut für Biogeochemie

All articles from Interdisciplinary Research >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>