Wednesday, November 18, 2009

Brisbane maps robotic future


Scientists in Brisbane are blurring the line between biology and technology and creating a new generation of robot "helpers" more in tune with human needs.

The University of Queensland is hosting the the Australian Research Council's Thinking Systems symposium this week, which brings together UQ's robotic navigation project with the University of New South Wales' robotic hands project and a speech and cognition project out of the University of Western Sydney.

Scientists are working towards a range of robotic innovations, from the development of navigation and learning robots to the construction of artificial joints and limbs and the creation of a conversational computer program, a la 2001: A Space Odyssey's HAL.

UQ's School of Information Technology and Electrical Engineering head, Professor Janet Wiles, said the symposium paired "some very clever engineers...with very clever scientists" to map the future of robotics - and it was going to be a very different world.

"You're bringing together neuroscience, cognitive science, psychology, behaviour and robotics information system to look at the cross disciplinary projects we can do in this space," Professor Wiles said.

"We're doing a combination of the fundamental science and the translation into the technology and that's one of the great benefits of our project."

The group aims to advance robotic technology by decoding the way human and animal brains work to equip machines with the ability to operate in the real world.

"There's a strong connection to cognition - the way the brain works as a whole - and navigation, so what we've been doing is studying the fundamental of navigation in animals and taking the algorithms we've learnt from those and putting them into robots," Professor Wiles said.

Over the next two decades, she sees robots becoming more and more important, expanding from their current roles as cleaners, assemblers and drones and into smarter machines more closely integrated with human beings in the form of replacement limbs and joints.

"It's not going to be the robots and us. Already a lot of people are incorporating robot components; people who have had a leg amputated who now have a knee and in the knee. It is effectively a fully-articulated robotic knee [with] a lot of the spring in the step that a natural knee has," Professor Wiles said.

"The ability of robots to replace component parts is an area which is going to be growing.

"This is where you're going to blur the line between technology and biology when you start to interface these two fields."

At UQ, the team is working on developing computer codes or algorithms that would enable a robot to "learn" rapidly about its near environment and navigate within it.

"Navigation is quite an intriguing skill because it is so intrinsic to what we do and we are really not aware of it unless we have a poor sense of navigation," Professor Wiles said.

"The kind of navigation we are dealing with is how you get from one place to another, right across town or from one room in a building to another you can't see."

With about four million robots in households right now, performing menial chores such as vacuuming the carpet, improvements in navigation has the potential to widen the scope of these creations to take a larger place in everyday life.

According to Professor Wiles, the ability to rapidly process information and apply it to the area they are working in will give robots the edge into the future.

"Robots need to learn new environments very rapidly and that's what a lot of our work focuses on.

"When you take a robot out of the box you don't want to program into it with the architecture of your house, you want the robot to explore the house and learn it very quickly," Professor Wiles said.

"Household robotics is going to be really big in the next 15 years or so and this is one of the things you need is for robots to be able to look after themselves in space."

But as Australian universities and international research institutes look into replicating the individual parts of biological creatures and mimic them in machines, the question of intelligence inevitably become more important.

While the sometimes frightening scenarios played out in science fiction novels and films - where so often robots lay waste to humanity - remains securely in the realm of fantasy, Professor Wiles believes that some day machines will think like us.

"There's strong AI [artificial intelligence] and weak AI. Strong AI says there will be artificially intelligent creatures which are not biological. Weak AI says they will have a lot of the algorithms and they do already have a lot of those algorithms," she said.

"The bee, whose brain is a tiny as a sesame seed, already has better navigation abilities than even our best robots.

"So we have a little way to go before robots reach biological intelligence let alone human intelligence but I don't see why we shouldn't take steps towards it."

Wednesday, October 21, 2009

Scientists Develop New Material For Robot Muscles



A group of researchers at the University of Texas have made a breakthrough in their quest to find a stronger, more effective material for use in making artificial muscles for robots. They’ve found a way to create tangled nanotube ribbons that are, relative to weight, stronger than steel and stiffer than diamond.

The ribbons have the remarkable ability to expand in width by 220% when a voltage is applied. When the voltage is removed, the ribbons return to their normal state. The shift in state occurs over mere milliseconds. Additionally, the nanotube ribbons retain their properties in an extreme range of temperature: between -196 °C and 1538 °C.

The scientists construct the nanotube ribbons into an aerogel, which contains primarily air. A cubic centimeter of the stuff weighs just 1.5 milligrams; one gram could cover a space of 30 square meters. Researchers are still experimenting with ribbon lengths. So far, the team has produced ribbons that are 1/50th of a millimeter thick, 16 centimeters wide and several meters long. Larger sheets are in the works.

Besides serving as material for artificial muscles, the nanotube ribbons could be used to create sturdy, lightweight structures in space.

Hydrogen muscle silences the domestic robot




IF ROBOTS are ever going to be welcome in the home they will need to become a lot quieter. Building them with artificial muscles that run on hydrogen, instead of noisy compressed-air pumps or electric motors, could be the answer.

Kwang Kim, a materials engineer at the University of Nevada in Reno, came up with the idea after realising that hydrogen can be supplied silently by metal hydride compounds.

Metal hydrides can undergo a process called reversible chemisorption, allowing them to store and release extra hydrogen held by weak chemical bonds. It's this property that has led to the motor industry investigating metal hydrides as hydrogen "tanks" for fuel cells.

To make a silent artificial muscle, Kim and his colleague Alexandra Vanderhoff first compressed a copper and nickel-based metal hydride powder into peanut-sized pellets. They then secured them in a reactor vessel and pumped in hydrogen to "charge" the pellets with the gas. A heater coil surrounded the vessel, as heat breaks the weak chemical bonds and releases the stored hydrogen.

The next step was to connect the vessel to an off-the-shelf artificial muscle, which comprises an inflatable rubber tube surrounded by Kevlar fibre braiding. Two of these placed either side of a robotic joint can mimic the push/pull action of muscles by being alternately inflated and deflated (see diagram).

Turning the heater on and off controls the flow of hydrogen into the rubber tube, causing the muscle to move silently. Even better, the pair say, the muscle performs as well as those that run on compressed air systems (Smart Materials and Structures, DOI: 10.1088/0964-1726/18/12/125014). Importantly, the gas didn't leak.

"The system has biological muscle-like properties for humanoid robots that need high power, large limb strokes - and no noise," says Kim.

Yoseph Bar-Cohen, an engineer specialising in artificial muscle technology at NASA's Jet Propulsion Lab in Pasadena, California, says this is "a novel approach" for controlling artificial muscles. "It is an important contribution and increases the arsenal of potential actuators that may become available in the future," he says.