But MIT’s Robust Robotics Group — which fielded the team that won the last AUVSI contest — has set itself an even tougher challenge: developing autonomous-control algorithms for the indoor flight of GPS-denied airplanes. At the 2011 International Conference on Robotics and Automation (ICRA), a team of researchers from the group described an algorithm for calculating a plane’s trajectory; in 2012, at the same conference, they presented an algorithm for determining its “state” — its location, physical orientation, velocity and acceleration. Now, the MIT researchers have completed a series of flight tests in which an autonomous robotic plane running their state-estimation algorithm successfully threaded its way among pillars in the parking garage under MIT’s Stata Center.

“The reason that we switched from the helicopter to the fixed-wing vehicle is that the fixed-wing vehicle is a more complicated and interesting problem, but also that it has a much longer flight time,” says Nick Roy, an associate professor of aeronautics and astronautics and head of the Robust Robotics Group. “The helicopter is working very hard just to keep itself in the air, and we wanted to be able to fly longer distances for longer periods of time.”

With the plane, the problem is more complicated because “it’s going much faster, and it can’t do arbitrary motions,” Roy says. “They can’t go sideways, they can’t hover, they have a stall speed.”

Found in Translation

To buy a little extra time for their algorithms to execute, and to ensure maneuverability in close quarters, the MIT researchers built their own plane from scratch. Adam Bry, a graduate student in the Department of Aeronautics and Astronautics (AeroAstro) and lead author on both ICRA papers, consulted with AeroAstro professor Mark Drela about the plane’s design. “He’s a guy who can design you a complete airplane in 10 minutes,” Bry says. “He probably doesn’t remember that he did it.” The plane that resulted has unusually short and broad wings, which allow it to fly at relatively low speeds and make tight turns but still afford it the cargo capacity to carry the electronics that run the researchers’ algorithms.

Because the problem of autonomous plane navigation in confined spaces is so difficult, and because it’s such a new area of research, the MIT team is initially giving its plane a leg up by providing it with an accurate digital map of its environment. That’s something that the helicopters in the AUVSI challenges don’t have: They have to build a map as they go.

But the plane still has to determine where it is on the map in real time, using data from a laser rangefinder and inertial sensors — accelerometers and gyroscopes — that it carries on board. It also has to deduce its orientation — how much it’s tilted in any direction — its velocity, and its acceleration. Because many of those properties are multidimensional, to determine its state at any moment, the plane has to calculate 15 different values.

That’s a massive computational challenge, but Bry, Roy and Abraham Bachrach — a grad student in electrical engineering and computer science who’s also in Roy’s group — solved it by combining two different types of state-estimation algorithms. One, called a particle filter, is very accurate but time consuming; the other, called a Kalman filter, is accurate only under certain limiting assumptions, but it’s very efficient. Algorithmically, the trick was to use the particle filter for only those variables that required it and then translate the results back into the language of the Kalman filter.

Confronting Doubt

To plot the plane’s trajectory, Bry and Roy adapted extremely efficient motion-planning algorithms (http://web.mit.edu/newsoffice/2011/smarter-robot-arms-0921.html) developed by AeroAstro professor Emilio Frazzoli’s Aerospace Robotics and Embedded Systems (ARES) Laboratory. The ARES algorithms, however, are designed to work with more reliable state information than a plane in flight can provide, so Bry and Roy had to add an extra variable to describe the probability that a state estimation was reliable, which made the geometry of the problem more complicated.

Paul Newman, a professor of information engineering at the University of Oxford and leader of Oxford’s Mobile Robotics Group, says that because autonomous plane navigation in confined spaces is such a new research area, the MIT team’s work is as valuable for the questions it raises as the answers it provides. “Looking beyond the obvious excellence in systems,” Newman says, the work “raises interesting questions which cannot be easily bypassed.”

But the answers are interesting, too, Newman says. “Navigation of lightweight, dynamic vehicles against rough prior 3-D structural maps is hard, important, timely and, I believe, will find exploitation in many, many fields,” he says. “Not many groups can pull it all together on a single platform.”

The MIT researchers’ next step will be to develop algorithms that can build a map of the plane’s environment on the fly. Roy says that the addition of visual information to the rangefinder’s measurements and the inertial data could make the problem more tractable. “There are definitely significant challenges to be solved,” Bry says. “But I think that it’s certainly possible.”

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Kazuki Iwatsuki from Nagoya Institute of Technology

Overview

No power supply, motor, or on/off switch – this is literally an unstoppable robot designed to wander earth one aluminum step at a time.

Ok, it’s not that dramatic, as the passive robot legs developed by a research team at the Nagoya Institute of Technology still need some work before they serve a practical purpose.  But a cool feat nonetheless, generating excitement about where such a development could lead.

During a walking test, the robot managed to take 100,000 steps in a row, strolling for 13 hours straight – all from a gentle push to get its movement started.  Equipped with “thighs,” “lower legs,” and “ankles,” the robot’s support is distributed proportionately in terms of length and weight.

Of course this is a much different type of robot than what we are accustomed to seeing.  Robotics courses or programming classes are more focused on writing code to command a powered robot to perform a variety tasks above and beyond walking.  But, with the Nagoya robot’s only source of power coming from potential energy by walking down a slight slope, it can serve as the driving force behind an assisted-walking device…one that is efficient and “very environmentally friendly” as stated by Nagoya researcher Kazuki Iwatsuki.

So maybe it isn’t apps that are taking over the world, but many questions still remain for these roaming robot legs – how do they stop their momentum?  Can they function uphill or on an even surface?  Can they be steered or are they able to change direction?  Either way, this development signals a big step in a new tech direction.

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This video is about a real cooperative solution for Swarm Robotics;

I have always imagined different kind of robots operate together. For Example fyling robots, heavy duty robots, small robots all work as members of a robotic society.  Flying robots can fly but their battery time will be limited so after some time they can land on battery carrier robots and continue their operation after charging on them.

Some robots may caryy wireless systems to increse the range of wireless. Some robots may carry high definition cameras so the swarm could be managed by humans. So this video is a good example for what is Swarm Robotics Bring to us in the future.

“Spatially Targeted Communication and Self-Assembly,” by Nithin Mathews, Anders Lyhne Christensen, Rehan O’Grady, and Marco Dorigo, from Universite Libre de Bruxelles and Instituto Universitario de Lisboa, was presented at IROS 2012 in Vilamoura, Portugal.

http://youtu.be/i3ernrkZ91E

” A future tip for robot invasions: Aim your gun for the fliers, they command the troops” (A youtube user’s comment  

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