Péter Fankhauser: Meet Rezero, the dancing ballbot

131,736 views ・ 2011-11-22

TED


Please double-click on the English subtitles below to play the video.

00:16
Let me introduce to you Rezero.
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This little fellow was developed
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by a group of 10 undergraduate students
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at the Autonomous Systems Laboratory
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at ETH-Zurich.
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Our robot belongs to a family of robots
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called Ballbots.
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Instead of wheels, a Ballbot is balancing
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and moving on one single ball.
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The main characteristics of such a system is
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that there's one sole contact point to the ground.
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This means that the robot
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is inherently unstable.
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00:44
It's like when I am trying to stand
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on one foot.
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You might ask yourself, what's the usefulness
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of a robot that's unstable?
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Now we'll explain that in a second.
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Let me first explain how Rezero
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actually keeps his balance.
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Rezero keeps his balance by constantly
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measuring his pitch angle with a sensor.
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01:02
He then counteracts and avoids toppling over
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by turning the motors appropriately.
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This happens 160 times per second,
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and if anything fails in this process,
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Rezero would immediately fall to the ground.
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01:14
Now to move and to balance,
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Rezero needs to turn the ball.
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The ball is driven by three special wheels
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that allow Rezero to move into any direction
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and also move around his own axis
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at the same time.
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Due to his instability, Rezero is always
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in motion. Now here's the trick.
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It's indeed exactly this instability that allows
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a robot to move very [dynamically].
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01:38
Let's play a little.
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01:40
You may have wondered what happens
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if I give the robot a little push.
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In this mode, he's trying to maintain
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his position.
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For the next demo, I'd like you to introduce
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to my colleagues Michael, on the computer,
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and Thomas who's helping me onstage.
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02:02
In the next mode, Rezero is passive,
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and we can move him around.
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With almost no force I can control
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his position and his velocity.
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I can also make him spin.
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In the next mode, we can get Rezero
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to follow a person.
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He's now keeping a constant distance to Thomas.
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02:42
This works with a laser sensor
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that's mounted on top of Rezero.
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02:50
With the same method, we can also
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get him to circle a person.
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We call this the orbiting mode.
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03:10
All right, thank you, Thomas.
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03:12
(Applause)
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03:16
Now, what's the use of this technology?
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For now, it's an experiment, but let me
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show you some possible future applications.
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03:28
Rezero could be used in exhibitions or parks.
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With a screen it could inform people or show
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them around in a fun and entertaining way.
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In a hospital, this device could be used to
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carry around medical equipment.
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03:39
Due to the Ballbot system, it has a very small
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footprint and it's also easy to move around.
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And of course, who wouldn't like
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to take a ride on one of these.
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And these are more practical applications.
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03:51
But there's also a certain beauty
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within this technology.
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03:55
(Music)
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04:58
(Applause)
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04:59
Thank you.
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05:01
(Applause)
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Thank you.
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