RoboTuna
{{short description|Investigation into design of autonomous underwater vehicles}}
File:RoboTuna, 1994, view 2 - MIT Museum - DSC03730.JPG.]]
The RoboTuna is a robotic fish project involving a series of robotic fish designed and built by a team of scientists at the Massachusetts Institute of Technology (MIT) in the US.
The Project
The project started in 1993. Their aim was to investigate the possibility of constructing a robotic submarine that could reproduce the way tunas swim and see if they could find a superior system of propulsion for the Autonomous Underwater Vehicles (AUVs).{{cite web |url=https://news.mit.edu/1994/robotuna |date=1994-09-13 |title=MIT's Robotic Fish Takes First Swim |website=MIT News |publisher=Massachusetts Institute of Technology |access-date=2022-11-25}} Their experiment was a success as they discovered that their fish was both more maneuverable and used less energy than other robotic submarines. The Science Museum in London, UK has one on display in their geophysics and oceanography section {{as of|2015|lc=y}}.{{cite web |url=http://www.sciencemuseum.org.uk/objects/oceanography/L2000-4475.aspx |title=RoboTuna, c.2000 |website=Oceanography |publisher=Science Museum |location=South Kensington, UK |access-date=2022-11-25 |url-status=dead |archive-url=https://web.archive.org/web/20150924114910/http://www.sciencemuseum.org.uk/objects/oceanography/L2000-4475.aspx |archive-date=2015-09-24}}{{cite news |url=http://edition.cnn.com/2009/TECH/science/08/31/robotic.fish.mit/index.html |title=MIT engineers create new school of robotic fish |date=August 31, 2009 |last=Erdman |first=Shelby |publisher=CNN |access-date=2022-11-25}}{{cite web |url=https://www.smithsonianmag.com/science-nature/somethings-fishy-about-this-robot-66399890/ |title=Something's Fishy about this Robot |last=Whynott |first=Douglas |date=2000-07-31 |website=Smithsonian Magazine |access-date=2022-11-25 |url-status=live |archive-url=https://web.archive.org/web/20211202182131/https://www.smithsonianmag.com/science-nature/somethings-fishy-about-this-robot-66399890/ |archive-date=2021-12-02}}
Improvements
While the early results were successful, the RoboTuna was not able to replicate the bursts of acceleration that real tuna were able to manage. Researchers improved the design using a genetic algorithm, in which the best systems will "get to have virtual offspring", according to researcher David Barrett. Early incarnations worked poorly but as the system evolved, the RoboTuna's abilities improved. Visualization techniques showed that the system had evolved so that the RoboTuna was taking advantage of vortices that it created. A swish of its tail one way created a vortex, which was then used by a swish the other way - propelling it off the vortex it had created. This technique not only helps to with normal swimming but explains the impressive standing start speeds of real tuna.
The Researchers
The team involved in the project included: Michael Triantafyllou, David Barrett who built the first RoboTuna (Charlie I) in 1995 for his PhD thesis, and David Beal and Michael Sachinis, who introduced several modifications including a cable-pulley system to produce RoboTuna II.{{cite book |chapter=Robotuna Project To Model Real Fish |chapter-url=http://tech.mit.edu/V115/N49/robotuna.49n.html |url=http://tech.mit.edu/V115/PDF/V115-N49.pdf |title=Vol. 115, Issue 49 |last=Isla |first=Damian |date=17 October 1995 |pages=13, 23 |work=The Tech |publisher=Massachusetts Institute of Technology |access-date=2022-11-25}}