NASA researchers are working on a whole new kind of robot - one that is spherical, travels by rolling and could land on a planet by simply hitting the surface and bouncing.
The concept is called tensegrities and focuses on robots, dubbed ball bots, made of a network of cables and rods. With no rigid connections, no legs, no wheels or tracks, they are uniquely robust, light-weight robots that can the force or pressure from coming out of orbit and hitting the surface of a planet.
"I've been looking at using this design principle in robotics because you see it used all through biology," said Vytas Sunspiral, a senior robotics researcher with NASA Ames Research Center. "We're finding evidence of it in the structure of our cells to the physiology of our muscles and bones."
He noted that one of the reasons biology would use this structure is because the tension network makes the body a robust system. "Using this principle, they can be lightweight compared to their strength," said Sunspiral. "The whole structure participates in absorbing applied pressures."
And that, he told Computerworld, makes this a uniquely apt design for robots.
"This could revolutionize how we explore space, quite possibly," said Sunspiral, who has been working on the tensegrity robotics project since its inception. "What we're doing here is putting multiple functions into a single structure. When you land on another planet, normally you have to do a lot to protect your rover. You have air bags or sky cranes or retro rockets. That adds a lot of mass for something you just use once during landing."
With a ball bot, NASA could skip using air bags or cranes and hit the surface of the planet fast and hard without suffering damage.
A ball bot, by rolling, might be less likely to get stuck in soft sand, which is what led to the demise of the Mars rover Spirit. That rover was abandoned and left for dead after scientists weren't able to get it out of the Martian mire.
"One way to look at this robot is as one giant wheel," said Sunspiral. "It would be better at going around or over obstacles and would have advantages against getting stuck. We have to explore this further."
A ball bot, which is an outer shell of rods and cables, could carry another sphere inside, connected by cables to the outer shell. The bot's power, batteries, scientific equipment and computers would be in the inside sphere.
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