Courtesy Andy Field (Field Offie)Researchers at Virginia Tech are working on several versions of robotic jellyfish that someday could be used by the military, or for mapping the ocean floor, or cleaning up oil spills.
Known affectionately as RoboJelly, the silicone blobs range from the size of a baseball to a giant five-foot floating monster. Each mimics the swimming technique used by jellyfish, those huffing and puffing water-bags that populate the world's oceans.
In nature, most jellyfish propel themselves by the seemingly simple expansion and contraction of their umbrella, using it to push water out like a rocket blast that propels it forward. But the fluid dynamics are a little more complicated than than just expelling out a big blast of water and moving the other way. It's more like when your cigar-smoking uncle would blow smoke rings into the air to impress you. Remember that? I do. These are called vortex rings, and it's the efficiency of the hydromedusean's self-created fluid flow that interest the VT researchers.
Students at VT's College of Engineering use thin layers of silicone - the same material used for swimming masks - to construct the robots. Electric batteries in watertight plexiglass boxes are used to power the mechanical blobs. The researchers are also looking into ways of extracting hydrogen from water to power them.
“Nature has done great job in designing propulsion systems but it is slow and tedious process," said Shashank Priya, associate professor at Virginia Tech, and the project's lead researcher. "On the other hand, current status of technology allows us to create high performance systems in a matter of few months.”
The on-going project involves a number of U.S. universities and industries, and will warrant several additional years of research before any prototypes are released for use. Besides possible military application, RoboJelly could be employed for such things as monitoring ocean currents and conditions, cleaning up oil spills, and studying sea-bottom flora and fauna.
Researchers at the University of Texas at Dallas and Virginia Tech have created an underwater robot that mimics the movement of a jellyfish. RoboJelly, as it has been dubbed, uses the hydrogen and oxygen gases from water as its fuel. So, theoretically, it would never run out of energy!
To make the robot move, the researchers covered a shape memory alloy, or smart metal (an alloy that "remembers" its original, pre-deformed, cold-forged shape), with multi-walled carbon nanotubes coated with a nano-platinum catalyst powder. When a mixture of hydrogen and oxygen contact the platinum, an exothermic reaction results, which causes the smart metal to change its shape. When the "muscles" relax, the alloy returns to its original form. No electricity, no batteries, and the only waste released is more water - super cool!
This research is sponsored by the US Navy in the hopes that it can be used in underwater rescue missions, or for surveillance purposes.
"Water striders don't really stride, they row on the water. But their legs are spindly and don't seem good for paddling. David Hu, mechanical engineer at Georgia Tech, wanted to understand the basic physics of how water striders glide. By filming them stride on food coloring and building his own robotic strider, he found out that the secret to the stride is in the paddle."
It's Friday. Yes, I know I missed it last week. But it's time for a new Science Friday video.
"The latest on the bug beat: To survive floods, fire ants band together to form a raft. They can sail for weeks. But how does the raft stay afloat? Researchers report the answer in PNAS this week. Plus, engineers at Tufts are looking to the caterpillar for inspiration for soft-bodied robots. The problem is that squishy bodies make it difficult to move quickly--but some caterpillars have developed a workaround."
Cleaning up oil spills costs big money. BP says the Gulf cleanup cost is $8 Billion. Hoping that next time we can do it better, faster, and cheaper, Wendy Schmidt has offered $1.4 Million in prizes to inspire a new generation of innovative solutions.
A $1 Million Prize will be awarded to the team that demonstrates the ability to recover oil on the sea surface at the highest oil recovery rate (ORR) and the highest Recovery Efficiency (RE).
If you are interested click here for the competition rules.
MIT may have a jump on the competition with their Seaswarm project. Last week they showed off what looked like a solar powered treadmill that lapped up spilled oil. Using GPS and wireless communication, a swarm of these devices autonomously coordinate their movements.
"We envisioned something that would move as a rolling carpet along the water and seamlessly absorb a surface spill," said MIT researcher Assaf Biderman. "This led to the design of a novel marine vehicle -- a simple and lightweight conveyor belt that rolls on the surface of the ocean, adjusting to the waves." Computerworld
They estimate that 5000 of their robotic sea-swarm vehicles could clean up a Gulf sized spill in a month.
"Based on mathematical models of the movement of fish, Maurizio Porfiri, an engineering professor at Polytechnic Institute of NYU, designed a robotic fish. When Porfiri puts the robofish in the lab pool with real fish, the minnows (golden shiners and giant danios) will mill about the robot and even follow it around.
Courtesy Roberto Rizzato ►pix jockey◄ Facebook resident (with adaptation by author)Remember HAL 9000, the super-computer in the movie 2001: A Space Odyssey ? Remember how creeped-out you felt listening to his soothing, matter-of-fact voice during his conversations with his astronaut masters - especially when his circuitry started to go haywire? In the end, it turned out, HAL wasn't much of a friend. Well, you may get the same creepy feeling watching this fascinating conversation between Vermont humanoid Bina48 and New York Time's reporter Amy Harmon.
Created by Hanson Robotics, Bina48 is a “friend robot”, a potential cyborg companion to help us humans while away the lonely hours of existence. Actually, she's a mass of wires and motors encased in a bust of "frubber", which, according to Bina48 herself, could stand for face rubber, or flesh rubber, or maybe fancy rubber. The flexible material and robotic inner workings allow it to mimic visual cues of human emotions, like smiles, frowns, and confused or amazed looks. In the Times article, its maker claims robots like Bina48 can “can make for genuine emotional companions”.
Bina48's programmers loaded her memory with tons of information and experiences derived from the real live Bina Rothblatt, a co-founder (along with her spouse Martine) of the Terasem Movement Foundation, an organization who's flagship project Lifenaut.com is defined as an “immortality social networking Web site” that helps subscribers achieve a measure of immortality through science and nanotechnology. I think how it works is you submit Body File data (DNA), and Mind File data (digital memories and memorabilia) to the site and create a sort of cyber-you that will live forever on the Internet. Hopefully, not in some horrible, banking site. Your DNA is preserved for future possibilities of creating a new analog “you”. I admit the notion piques my interest, and I think there could be a good chance you’ll be seeing a MDR59 or a JGordon27 in the next couple years, but that’s fodder for a future post.
But back to our main topic...
Bina48 lives (or rather, is housed) at the Terasem Movement Foundation office, in Bristol, Vermont. The thing is not perfect by any means, and if you watch the video, you have to admit a conversation with Bina48 is kind of a strange experience. It stammers, hesitates, and clams up when confused, and at times seems to show no interest at all, and rarely makes eye contact with the reporter. But once in a while it answers questions coherently and intelligently (in a way it reminded me of conversations I’ve had with someone stricken with Asperger syndrome). Sometimes, despite her apparent inability to always stay “engage” in the conversation, Bina48 does show hints of a sense of humor (e.g. plans to over the world), and an occasional aching to become a real (or better) person. There’s something quite human about that. So I think the idea of“friend robots” show lots of promise of becoming something pretty cool when all the glitches and bugs are finally eliminated. But without any foibles, could they actually be considered human?
(Little Dog) methodically moves over obstacles much larger than its leg length and body size—it measures 11.8 by 7.1 inches (30 by 18 centimeters), stands 5.5 inches (14 centimeters) tall and weighs 4.9 pounds (2.2 kilograms). Scientific American
Our first National Robotics Week (April 10 - April 18) ends today. Created by congress just last month, the National Robotics Week celebrations will help inspire students of all ages to pursue careers in robotics and other STEM (Science, Technology, Engineering, and Math) related fields.
During National Robotics Week, a week-long series of events and activities is aimed at increasing public awareness of the growing importance of “robo-technology” and the tremendous social and cultural impact that it will have on the future of the United States. NatRoboticsWk.org/about