HOVs, ROVs and AUVs Marine Instrumentation Class.
-
Upload
amberly-howard -
Category
Documents
-
view
222 -
download
0
Transcript of HOVs, ROVs and AUVs Marine Instrumentation Class.
HOVs, ROVs and AUVsHOVs, ROVs and AUVs
Marine Instrumentation ClassMarine Instrumentation Class
HOVHOV
• Human Occupied Vehicle– Alvin– Pisces IV and V– Johnson Sea Link
Benfits/LimitationsBenfits/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
UUVUUV
• Unmanned Underwater Vehicle– AUVs– ROVs
ROVsROVs
• 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.
ROVsROVs
• Scientific research– Can perform tasks
instrumentation is not capable of
• Push cores• Organism collection• Instrument retrieval• Exact location sample
collection
– Cheaper than a HOV
Benefits/LimitationsBenefits/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
AUVAUV
• Autonomous Underwater Vehicle– Various of sizes
• One-Man portable to couple of tons
– Powered by propeller– Depth Range
• 0-6000m– Dependent on Model
Eagle Ray AUV - NIUSTEagle Ray AUV - NIUST
Benefits/LimitationsBenefits/Limitations
• Battery life– Hours
• Large payload capabilities– Capable of taking instrumentation with high
power requirements• Limits duration
• Most require surface support vessel
GlidersGliders
• 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
Underwater Glider OperationUnderwater Glider Operation
Energy only needed attop and bottom of each‘yo’ to change buoyancy
Wings provide forwardmotion during sinkingand floating
No external moving partsneeded to control glider,control managed throughchanges in position of aninternal mass
Slide Taken from ANT Littoral glider presentation
Teledyne Webb Research
Benefits/limitations Benefits/limitations
• Long deployments– Months
• “real-time” data during deployment
• Limited payload
• Most are small easy to recover
• Communication fees are high
PowerPower
• 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
Limitations for all typesLimitations for all types
• Density– Limited be displacement motor
• Currents
ChallengesChallenges
• 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
CommunicationsCommunications
• ROV- Cable• AUV
– Freewave (Radio comms)• Surface
– Iridium (Satellite Comms)• Surface
– Acoustic• Subsurface
• Gliders– Freewave
• Surface
– Iridium • Surface