The IMPASS robot will use rimless wheels with spokes that can lengthen or shorten according to terrain. IMPASS, which stands for Intelligent Mobility Platform with Active Spoke System, is under development at Virginia Polytechnic Institute and State University.
Hong designed the system along with colleague Doug Laney.
Legs work better when negotiating very rough terrain, but are often slower than wheeled vehicles on smooth surfaces. The IMPASS system tries for the best of both worlds; the three spokes can be made to lengthen or shorten independently, allowing the robot to adjust itself to overcome obstructions. Turning can be done by varying spoke length as well.
Smart wheels use sonar, laser range finding and millimeter wave radar to identify mufflers and other debris. Each one consists of a hub with many tiny spokes. Each spoke telescopes into five sections. On the end is a squat foot, rubber tread on the bottom, swiveling on a ball joint. As the wheel rolls, the feet plant themselves one at a time, almost glomming into one continuous tire...
(Read more about Neal Stephenson's smart wheels)
Hong and Laney hope to complete a prototype version of the IMPASS robot early next year.
You might also be interested in this related item - the Tweel, which combines both the spokes and the tire. Here's another device that actually moves by adjusting spoke length - Soft Robot Powered by Shape Memory Alloy Spokes. The original story was found here.
(This Science Fiction in the News story used with permission from Technovelgy.com - where science meets fiction.)