May 14, 2006
Underwater Robot That Swims Like A Fish
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Robot Fish Students and professors at Nanyang Technological University have developed robots that swim like fish.
They have developed robots that swim like a fish.
To perfect their robot’s seamless movements underwater, the researchers have for two years been studying how a fish swims in water.
Low Kin Huat, Associate Professor, NTU’s Mechanical & Aerospace Engineering, said: “Definitely we can see that the fish is a smart swimmer. We believe that by knowing and understanding the nature of the fish’s swimming mode, we would be able to come up with a smart swimming vehicle.
“Submarines and so-called ROVs (Remotely Operated Vehicles), they actually use a propeller. But in this robot fish design, actually we use a natural undulating fin motion. You can see that it’s quite quiet and actually it’s good for the environment, talking about pollution issues, talking about noise issues.”
The researchers have been studying stingrays and knife-fish by observing how their fins move when they swim.
Associate Professor Low said: “We came up with the fin mechanism which is re-configurable and also modular — it can be used to model different types of fish by changing something.”
The size of the fin can also be varied by adding or reducing the number of spokes.
By adding a camera or a compass, they expect the robotic fish to be useful in surveillance, spying, de-mining, sea floor mapping and biological research.
But it may take a few more prototypes before this can be realised.
Aw Wai Leong, a NTU’s Mechanical & Aerospace Engineering final-year student, said: “This is a totally new mode of swimming, so you can’t expect it to be as fast, as efficient as the normal propeller. I believe with more research into this undulating fin, it may one day replace the normal propeller inside the underwater submersible.”
The researchers expect to roll out a complete robotic fish in two years.
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