Translator: Joseph Geni Reviewer: Morton Bast
So what does it mean for a machine to be athletic?
We will demonstrate the concept of machine athleticism
and the research to achieve it
with the help of these flying machines called quadrocopters,
or quads, for short.
Quads have been around for a long time.
They're so popular these days because they're mechanically simple.
By controlling the speeds of these four propellers,
these machines can roll, pitch, yaw,
and accelerate along their common orientation.
On board are also a battery, a computer,
various sensors and wireless radios.
Quads are extremely agile, but this agility comes at a cost.
They are inherently unstable,
and they need some form of automatic feedback control
in order to be able to fly.
So, how did it just do that?
Cameras on the ceiling and a laptop
serve as an indoor global positioning system.
It's used to locate objects in the space
that have these reflective markers on them.
This data is then sent to another laptop
that is running estimation and control algorithms,
which in turn sends commands to the quad,
which is also running estimation and control algorithms.
The bulk of our research is algorithms.
It's the magic that brings these machines to life.
So how does one design the algorithms that create a machine athlete?
We use something broadly called model-based design.
We first capture the physics
with a mathematical model of how the machines behave.
We then use a branch of mathematics called control theory
to analyze these models
and also to synthesize algorithms for controlling them.
For example, that's how we can make the quad hover.
We first captured the dynamics with a set of differential equations.
We then manipulate these equations with the help of control theory
to create algorithms that stabilize the quad.
Let me demonstrate the strength of this approach.
Suppose that we want this quad to not only hover
but to also balance this pole.
With a little bit of practice,
it's pretty straightforward for a human being to do this,
although we do have the advantage of having two feet on the ground
and the use of our very versatile hands.
It becomes a little bit more difficult
when I only have one foot on the ground
and when I don't use my hands.
Notice how this pole has a reflective marker on top,
which means that it can be located in the space.
(Audience) Oh!
(Applause)
(Applause ends)
You can notice that this quad is making fine adjustments
to keep the pole balanced.
How did we design the algorithms to do this?
We added the mathematical model of the pole
to that of the quad.
Once we have a model of the combined quad-pole system,
we can use control theory to create algorithms for controlling it.
Here, you see that it's stable,
and even if I give it little nudges,
it goes back --
to the nice, balanced position.
We can also augment the model
to include where we want the quad to be in space.
Using this pointer, made out of reflective markers,
I can point to where I want the quad to be in space
a fixed distance away from me.
(Laughter)
The key to these acrobatic maneuvers is algorithms,
designed with the help of mathematical models
and control theory.
Let's tell the quad to come back here
and let the pole drop,
and I will next demonstrate the importance
of understanding physical models
and the workings of the physical world.
Notice how the quad lost altitude when I put this glass of water on it.
Unlike the balancing pole,
I did not include the mathematical model of the glass
in the system.
In fact, the system doesn't even know that the glass is there.
Like before, I could use the pointer to tell the quad
where I want it to be in space.
(Applause)
(Applause ends)
Okay, you should be asking yourself,
why doesn't the water fall out of the glass?
Two facts.
The first is that gravity acts on all objects in the same way.
The second is that the propellers
are all pointing in the same direction of the glass, pointing up.
You put these two things together,
the net result is that all side forces on the glass are small
and are mainly dominated by aerodynamic effects,
which at these speeds are negligible.
And that's why you don't need to model the glass.
It naturally doesn't spill, no matter what the quad does.
(Audience) Oh!
(Applause)
(Applause ends)
The lesson here
is that some high-performance tasks are easier than others,
and that understanding the physics of the problem
tells you which ones are easy and which ones are hard.
In this instance, carrying a glass of water is easy.
Balancing a pole is hard.
We've all heard stories of athletes performing feats while physically injured.
Can a machine also perform with extreme physical damage?
Conventional wisdom says
that you need at least four fixed motor propeller pairs in order to fly,
because there are four degrees of freedom to control:
roll, pitch, yaw and acceleration.
Hexacopters and octocopters, with six and eight propellers,
can provide redundancy,
but quadrocopters are much more popular
because they have the minimum number of fixed motor propeller pairs: four.
Or do they?
(Audience) Oh!
(Laughter)
If we analyze the mathematical model of this machine
with only two working propellers,
we discover that there's an unconventional way to fly it.
We relinquish control of yaw,
but roll, pitch and acceleration can still be controlled
with algorithms that exploit this new configuration.
Mathematical models tell us exactly when and why this is possible.
In this instance, this knowledge allows us to design
novel machine architectures
or to design clever algorithms that gracefully handle damage,
just like human athletes do,
instead of building machines with redundancy.
We can't help but hold our breath
when we watch a diver somersaulting into the water,
or when a vaulter is twisting in the air,
the ground fast approaching.
Will the diver be able to pull off a rip entry?
Will the vaulter stick the landing?
Suppose we want this quad here to perform a triple flip
and finish off at the exact same spot that it started.
This maneuver is going to happen so quickly
that we can't use position feedback to correct the motion during execution.
There simply isn't enough time.
Instead, what the quad can do is perform the maneuver blindly,
observe how it finishes the maneuver,
and then use that information to modify its behavior
so that the next flip is better.
Similar to the diver and the vaulter,
it is only through repeated practice
that the maneuver can be learned and executed
to the highest standard.
(Laughter)
(Applause)
Striking a moving ball is a necessary skill in many sports.
How do we make a machine do
what an athlete does seemingly without effort?
(Laughter)
(Applause)
(Applause ends)
This quad has a racket strapped onto its head
with a sweet spot roughly the size of an apple, so not too large.
The following calculations are made every 20 milliseconds,
or 50 times per second.
We first figure out where the ball is going.
We then next calculate how the quad should hit the ball
so that it flies to where it was thrown from.
Third, a trajectory is planned that carries the quad
from its current state to the impact point with the ball.
Fourth, we only execute 20 milliseconds' worth of that strategy.
Twenty milliseconds later, the whole process is repeated
until the quad strikes the ball.
(Applause)
Machines can not only perform dynamic maneuvers on their own,
they can do it collectively.
These three quads are cooperatively carrying a sky net.
(Applause)
(Applause ends)
They perform an extremely dynamic and collective maneuver
to launch the ball back to me.
Notice that, at full extension, these quads are vertical.
(Applause)
In fact, when fully extended,
this is roughly five times greater than what a bungee jumper feels
at the end of their launch.
The algorithms to do this are very similar
to what the single quad used to hit the ball back to me.
Mathematical models are used to continuously re-plan
a cooperative strategy 50 times per second.
Everything we have seen so far has been about the machines and their capabilities.
What happens when we couple this machine athleticism
with that of a human being?
What I have in front of me is a commercial gesture sensor
mainly used in gaming.
It can recognize what my various body parts
are doing in real time.
Similar to the pointer that I used earlier,
we can use this as inputs to the system.
We now have a natural way of interacting
with the raw athleticism of these quads with my gestures.
(Applause)
Interaction doesn't have to be virtual.
It can be physical.
Take this quad, for example.
It's trying to stay at a fixed point in space.
If I try to move it out of the way, it fights me,
and moves back to where it wants to be.
We can change this behavior, however.
We can use mathematical models
to estimate the force that I'm applying to the quad.
Once we know this force, we can also change the laws of physics,
as far as the quad is concerned, of course.
Here, the quad is behaving as if it were in a viscous fluid.
We now have an intimate way of interacting with a machine.
I will use this new capability to position
this camera-carrying quad to the appropriate location
for filming the remainder of this demonstration.
So we can physically interact with these quads
and we can change the laws of physics.
Let's have a little bit of fun with this.
For what you will see next,
these quads will initially behave as if they were on Pluto.
As time goes on, gravity will be increased
until we're all back on planet Earth,
but I assure you we won't get there.
Okay, here goes.
(Laughter)
(Applause)
Whew!
You're all thinking now,
these guys are having way too much fun,
and you're probably also asking yourself,
why exactly are they building machine athletes?
Some conjecture that the role of play in the animal kingdom
is to hone skills and develop capabilities.
Others think that it has more of a social role,
that it's used to bind the group.
Similarly, we use the analogy of sports and athleticism
to create new algorithms for machines
to push them to their limits.
What impact will the speed of machines have on our way of life?
Like all our past creations and innovations,
they may be used to improve the human condition
or they may be misused and abused.
This is not a technical choice we are faced with;
it's a social one.
Let's make the right choice,
the choice that brings out the best in the future of machines,
just like athleticism in sports can bring out the best in us.
Let me introduce you to the wizards behind the green curtain.
They're the current members of the Flying Machine Arena research team.
(Applause)
Federico Augugliaro, Dario Brescianini,
Markus Hehn, Sergei Lupashin, Mark Muller and Robin Ritz.
Look out for them. They're destined for great things.
Thank you.
(Applause)