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HOVs, ROVs and AUVs

HOVs, ROVs and AUVs. Marine Instrumentation Class. HOV. Human Occupied Vehicle Alvin Pisces IV and V Johnson Sea Link. Benfits/Limitations. HOVs You are right there to see what is going on Limited by battery and air supply Quiet large and complicated to operate

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HOVs, ROVs and AUVs

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  1. HOVs, ROVs and AUVs Marine Instrumentation Class

  2. HOV • Human Occupied Vehicle • Alvin • Pisces IV and V • Johnson Sea Link

  3. Benfits/Limitations • HOVs • You are right there to see what is going on • Limited by battery and air supply • Quiet large and complicated to operate • Usually have a dedicated support ship

  4. UUV • Unmanned Underwater Vehicle • AUVs • ROVs

  5. ROVs • Remotely Operated Vehicle • Connected to ship with a cable • Cable called either • Tether • Umbilical cable • Fiber-optic cable with power and strength members • Unlimited capabilities • Wide Varity of sizes • Micro (less then 3kg) • Trenching more than 200hp • Two mode of operation • Free Swimming • Garaged • Large component in the Oil and Gas industry • Pipeline inspection/repair • Cable inspection • Etc.

  6. ROVs • Scientific research • Can perform tasks instrumentation is not capable of • Push cores • Organism collection • Instrument retrieval • Exact location sample collection • Cheaper than a HOV

  7. Benefits/Limitations • ROV • Complete control over operations • For deepwater takes place of diver • Can perform challenging tasks over long periods of time • Continuously if needed • Limitations lifting capability • Requires skilled operator

  8. AUV • Autonomous Underwater Vehicle • Various of sizes • One-Man portable to couple of tons • Powered by propeller • Depth Range • 0-6000m • Dependent on Model

  9. Eagle Ray AUV - NIUST

  10. Benefits/Limitations • Battery life • Hours • Large payload capabilities • Capable of taking instrumentation with high power requirements • Limits duration • Most require surface support vessel

  11. Gliders • Glider through the water using only buoyancy as propulsion • No external moving parts • Travel Through water in Saw-tooth pattern • Depth Range • 0-1200m • Dependent on model • Multiple types • Spray • SeaGlider • Webb Glider • Wave Glider • ANT Wave Glider

  12. Underwater Glider Operation No external moving partsneeded to control glider,control managed throughchanges in position of aninternal mass Energy only needed at top and bottom of each ‘yo’ to change buoyancy Wings provide forward motion during sinking and floating Slide Taken from ANT Littoral glider presentation

  13. Teledyne Webb Research

  14. Benefits/limitations • Long deployments • Months • “real-time” data during deployment • Limited payload • Most are small easy to recover • Communication fees are high

  15. Power • Wave Power • Batteries • Alkaline, lithium…. • Thermal • Teledyne Webb Glider • Use Ocean temperature change to alter the state of a wax, creating power • Solar Wave Glider Power Concept

  16. Limitations for all types • Density • Limited be displacement motor • Currents

  17. Challenges • Positioning underwater • AUV/ROV/HOV • USBL • Tracked by surface ship • Doppler Velocity Log (DVL) • Bottom Tracking • Gliders • Dead Reckoning • Internal Navigation System (INS) • Acquires new position every time it surfaces to calculated Currents

  18. Communications • ROV- Cable • AUV • Freewave (Radio comms) • Surface • Iridium (Satellite Comms) • Surface • Acoustic • Subsurface • Gliders • Freewave • Surface • Iridium • Surface

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