(Left) Tsukuyomi at its frst sea test in Sagami Bay.
(Right) The general arrangement of the Tsukuyomi glider.
term to obtain the required data with limited resources. The
data should be merged with computer simulations to elucidate the behavior of the whole ocean.
For example, the Arctic Ocean, Antarctic Ocean and
their surrounding oceans are presumed to be key areas
where seawater descends and starts to circulate in deep
water throughout the world. Underwater gliders for virtual
mooring would meet the requirements for their study.
Common underwater gliders are designed to travel a long
distance, but Tsukuyomi is designed to stay in designated
waters and to monitor the ocean environment for a long
time. Therefore, it can descend and ascend with a steep elevation angle, glide with a gentle elevation angle and travel a
long distance. Capable of diving to 3,000 meters, Tsukuyomi
will be able to touch down to the seafoor in various waters,
where it can sleep to extend the monitoring duration.
Tsukuyomi, weighing 150 kilograms and measuring 2.5
meters long, glides underwater making use of a buoyancy
engine (BE) and a gravity center controller (GCC).
The BE, developed by JAMSTEC and Tsurumi Seiki Co.
Ltd. (Yokohama, Japan) for the profling foat Deep-NINJA,
consists of a hydraulic piston pump and valves. A two-way
valve was added between the oil bladder and the oil reservoir. It is rated to 4,000 meters depth.
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16 st / DECEMBER 2012