Page 56: of Marine Technology Magazine (January 2014)

Subsea Vehicles: UUVs

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Products iXBlue Gyrocompass Systems to RFA Tankers iXBlue will supply Quadrans Þ ber- optic gyrocompass systems for instal-lation aboard the four new Tide Class tankers of the U.K. Royal Fleet Auxil- iary (RFA). The systems to be supplied to Kelvin Hughes Limited will be inte- grated as a sub-system of the Integrated Bridge Systems for delivery to Daewoo Shipbuilding and Marine Engineering (DSME) in South Korea where the ves- sels are under construction.The deliveries will comprise twin QUADRANS gyrocompass units, con- trol and display and data distribution units (DDU) plus a comprehensive net- work of ancillary repeaters from U.K.- based Marine Data Limited. Ecuador Adds TRIAXYS Wave Buoys AXYS Technologies delivered three TRIAXYS Next Wave Directional Wave Buoys to Instituto Oceanogr?- Þ co De La Armada (INOCAR) of Ecuador. These TRIAXYS buoys will be added to the existing coastal wave monitoring network of TRIAXYS buoys owned by INOCAR and de- ployed along the Ecuador coastline. The mission of INOCAR is to plan, direct, coordinate and control the technical and administrative activi- ties related to Hydrographic Service, Navigation, Oceanography, Meteorol- ogy, Marine Sciences, Marine Signal- ing and administration of specialized equipment to its activity. HydroComp NavCad: New Submarine SWATH Capabilities 2,000 lbs. Buoyant Fiber Optic Cable Linden Photonics reaches new ex- tremes with a high strength, buoyant cable that has a breaking strength in excess of 2,000 lbs. and a measured density of 1.00g/ml. This cable ß oats in water. A proven subsea Þ ber opti- cal cable sold worldwide, STFOCTM serves at the main Þ ber optic element. HydroComp NavCad is a software tool for the prediction and analysis of vessel speed and power performance. It also provides for the selection of suitable propulsion system components Ð engines, gears and propellers.A recent development effort has been undertaken to pro- vide new submarine and SWATH performance analysis in NavCad. This includes new deÞ nitions for submerged hull form geometry, and the prediction of resistance and hull- propulsor interaction coefÞ cients.The deÞ nition of the submerged hulls of submarines and SWATH vessels in NavCad is a new treatment of traditional parametric descriptions of Òbody-of-revolutionÓ submarine hulls (e.g., Jackson 1992). The traditional parametric data has been expanded to provide for non-cylindrical sections, as well as increased detail of nose geometry. It also includes def- inition of single strut geometry suitable for SWATH vessels. NavCad now provides the user with three different resistance prediction methods for bare-hull drag Ð a SWATH-speciÞ c algorithm and two submarine-derived prediction methods. One of the submarine methods is based on HydroCompÕs re- cent reanalysis of the Series 58 tests (including the extended Òparallel mid-body seriesÓ). On-going HydroComp research for submarine resistance includes a study for added wave- making resistance when running at shallow depth. Added resistance for appendages will leverage NavCadÕs existing prediction functions.The standard framework for NavCad is built around surface vessels that follow prescribed prediction methodologies. The Submarine/SWATH predictions are treated as supplemental calculations that are ÒdeÞ nedÓ outside of the standard frame- work. The appropriate performance results array will be cal- culated and locked, and the prediction method identiÞ ed in the ÒDeÞ nedÓ caption. This new extension for NavCad is the Þ rst of a number of focused ÒmodulesÓ to the standard prediction framework. On-going module development for similar new capabilities includes re-analysis of barge train resistance and new hybrid wave-making codes. The new Submarine/SWATH features are available immediately to all NavCad customers with an active update subscription.January/February 2014 56 MTRMTR #1 (50-64).indd 56MTR #1 (50-64).indd 561/24/2014 10:04:03 AM1/24/2014 10:04:03 AM

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