Sea Technology

MAR 2014

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 20 of 75 March 2014 / st 21 For propulsion, this glider has the biggest ballast volume (1 liter) to in- crease speed (1 knot horizontal) and navigation capability in current. This also grants the glider high ballasting dynamics and greater maneuverability, especially in shallow water. This ballast is extremely effcient in both shallow- and deepwater. Communications with the glider are enhanced by using piloting commands instead of downloading long mission fles. Synthetic frames are exchanged with the glider to make communica- tions faster and more reliable. Engineers have designed the vehicle to offer an interchangeable sensor pay- load. This way, scientists can easily and quickly replace sensor payload with equipped nose cone sections avail- able off-the-shelf, depending on the mission. There is no need to open the "guts" of the vehicle and spend a few days adjusting the buoyancy and trim of the vehicle. As such, it can be said that the SeaExplorer is really a multi- mission glider. Furthermore, the scien- tifc payload has open-source frmware for easier integration of custom sen- sors. The SeaExplorer is powered by re- chargeable batteries. Indeed, although all gliders on the market traditionally use alkaline or primary lithium batter- ies, ACSA is the frst glider manufactur- er to introduce rechargeable lithium- ion batteries as an effective, reliable and affordable solution for the market. This green technology means free re- conditioning, low work force and no opening/closing of the vehicle after each mission, which makes it safer for the internal components and offers a highly cost-effective solution. Breaking Records The SeaExplorer has completed a two-month record mission in col- laboration with the Laboratoire d'Océanographie de Villefranche (LOV) of the National Center for Sci- entifc Research (CNRS) and Pierre and Marie Curie University (UPMC). The glider was launched south of Nice, France, on September 5, 2013, and was recovered on November 5 at the Bay of Angels on the French Riviera. Completing a two-month mission, the SeaExplorer became the frst glider to break two world records for endur- ance for multisensor UUVs powered by rechargeable batteries. Reaching the milestone of 60 days and a total of 1,183 kilometers on a single battery charge, the SeaExplorer successfully set a world record for duration and distance. The SeaExplorer averaged 0.5 knots speed and provided more than 1,168 profles of the water column from near surface to 500 meters depth with 100 percent successful commu- nications, even in high sea states. Su- pervised by satellite telemetry from an onshore offce using ACSA's IRIS soft- ware, the performance was manually stopped with internal parameters indi- cating 18 percent of the glider's battery energy still remaining. Conclusion The success of this record-breaking mission performed by a small, re- Interchangeable nose sections (scientifc payload). USA 1.508.291.0057 Clearly Superior Imaging SONAR SYSTEMS SUB-BOTTOM PROFILERS BATHYMETRY SYSTEMS SIDE SCAN SONARS The Leader in Underwater Technology MarBook.indd 21 3/10/14 2:13 PM

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