Download Overview - Ocean Networks Canada

Overview
Neptune Canada is building the world’s largest cabled seafloor observatory off the west coast
of Vancouver Island. This network of five sub-sea observatories is linked by 800
kilometers of powered electro-optic cable across the northern Juan de Fuca tectonic plate
(R. Barns, et al. 2008, refer to Fig. 0.1.)
Vertical Profiling System (VPS) belongs to Barkley Canyon Site, one of the observatories.
VPS will be located at 400m depth of seafloor, 700m away from Joint Box 5 which is settled
10km north of Barkley Canyon Node (refer to Fig. 0.2.)
Fig. 0.1 NEPTUNE Project Undersea Network
Fig. 0.2 Barkley Canyon Node & Joint Box
VPS is composed of Platform and Instrument Package. Instrument Package shifts between
near-seafloor and sea-surface with programmable speeds. During shift in water column,
VPS measures near-real-time hydrological parameters related with primary-production
and/or global warming gas (refer to Fig. 0.3.). VPS was designed from 2007 Apr. and
manufactured by 2008 Sept.
Fig. 0.3 Vertical Profiler System
1
1.1
Structure
MA531291_Mechanical_Block_Diagram.pdf
DMAS: Instruments Operation
Router
Instrument Package
Shore Based PC : Winch Operation
Shore Instruments
Node
Metallic Cable:
Power and Communication
Node
Winch
Platform
Node
Junction Box
Fig. 0.4 VPS Overview
1.1.1
Platform
EO218001_Electrical_Block_Diagram_Platform.pdf
MA531293-Conn_Cable_assign(PF).pdf
1.1.2
Instrument Package
EO218002_Electrical_Block_Diagram_Instrument_Package.pdf
MA531292-Conn_Cable_assign(IP).pdf
2
1.2
Specifications
Node-VPS Interface
Connector
Supply Voltage
Supply Power
Communication Interface
Protocol
: ODI Nautilus 12 conductors
: 260 to 400VDC
: 2.5kW or less
: 100Base-T Ethernet 4 Conductors
: TCP/IP UDP SNMP HTML XHTML
Platform - Instrument Package Interface
Connector
: Focal Slip Rings 8 conductors
Cable (Metallic Cable)
Cable Conductors
: 2 each 18AWG single,
2 Shielded Twisted Pair 26AWG
Cable Diameter
: 10.1mm
Cable Length
: 600m
Cable breaking strength
: 2000kgf
Supply Voltage
: 365 to 380VDC (2 each 18AWG single 20ohm/km)
Supply Power
: 400W or less
Communication Interface
: VDSL 10Mbps
Fig. 0.5 Appearance of VPS
3
1.2.1
Platform
Maximum Operating Depth
Dimensions (W*D*H)
Weight
Cable Length Capacity
Winch Power Output
Winch Speed
Communication Interface
Operating mode
: 400msw (Breaking depth: 500msw)
: 2690*1790*2260 mm (see drawings)
: In Air approx. 1500 kgf / In Seawater approx. 1300 kgf
: 600m
: 850W maximum
: 0.2 to 0.4m/s (Within 2 hours per one cycle)
: 100Base-T or 10Base-T Ethernet
: 1) Continuous Mode
: 2) Time Specific Mode
: 3) Fixed Depth Mode
: 4) Event Response Mode
Fig. 0.6 Appearance of Platform
4
1.2.2
Instrument Package
Maximum Operating Depth
Dimensions (OD*H)
Weight
Material faced on sea-water
Profiling Range
Buoyant Material
Sensor Interface
Sensor Supply Power
Ethernet Port
Installed Sensors
Monitoring Function
Capacity of Spare Sensors
: 400msw (Breaking depth: 500msw)
: 900*1445mm (see drawings)
: In Air approx. 500kgf / In Seawater -60kgf
: Titanium and Plastic
: From sea surface (0 meter) to 4 meters above seabed
: Co-polymer foam (Specific gravity: 0.4)
: RS232C, RS422, RS485, Analog Input (Ether/Serial)
: 12 VDC, Maximum 20W for each sensor (Total 100W)
: 12 ports
: Hyper OCR Irradiance, Hyper OCR Radiance,
ISUS Nitrate Sensor, Optode, SBE19+ / SBE5P,
Fluorometer WetStar (CDOM), ECO FLNTUS, CO2 Pro,
ADCP Aquadopp 400kHz, Ethernet Hydrophone, AWCP,
Depth Sensor
: Current and voltage for each sensor, Magnetic compass,
Three-axis acceleration and tilt, Depth
: 1 ports, Supply Power 10W, Buoyancy 16N
Fig. 0.7 Appearance of Instrument Package
5
1.3
Features
Feature 1
Winch Drum Moves Laterally to Uniformly Rewind Cable.
Its structure is simpler than that of the conventional shifter-type. Loads applied to the cable
are reduced as inlet and outlet for the cable are proximal to each other. Electro-magnetic
brake is commonly used in the industry; On this winch, however, a worm gear unit behaves
as a brake.
Oil Filled Slip Ring
Oil Filled Main Gearbox
Oil Filled
Worm Gearbox
Oil Filled AC Motor
Fig. 0.8 Appearance of Winch
Feature 2
SVD (Sensorless Vector Drive) Controls AC Motor (3-phase, 230V, 1.3kW).
- No inrush current = Small voltage drop
- Speed control is possible without a tachometer.
- High torque can be generated even at a low revolution range.
DC 360V
８５０W Output
AC230V
Fig. 0.9 Driver and Motor
6
Feature 3
Two Sets of [Camera + Light] Are Mounted.
Two sets of [Underwater CCD Color Video Camera + LED Light] are mounted on Platform in
order to monitor motions of the winch and sheave and behavior of Instrument Package at
docking. Video signals are converted to MPEG by Video Server and transmitted to an
onshore station through Network. Monitoring can be done on a PC browser.
Network
（MPEG)
NTSC
Zoom Focus
Fig. 0.10 Camera System
Feature 4
Measure for Heat Release
On Platform, heat of max. 300W generated by the power supply. To efficiently release such
heat to seawater, the following schemes have been established on this system:
- Power supply is allocated for 4 different targets of uses: Motor, Instrument Package,
Camera and System.
- On DC/DC Converter on each power supply board, Heat Discharge Block is mounted.
- Four power supply boards are arranged at 90° intervals in coherence with the cylindrical wall
of the pressure-proof vessel.
- Power supply directly contacts the vessel lid. Coherence is established via Silicon Rubber
Sheet.
- Each heat sink is equipped with a temperature sensor, which regularly monitors heat.
Fig. 11: Platform Main Housing and Power Board
7
Feature 5
Measure against Corrosion of Metal
SS304 is used for the frame of Platform and Vessel; aluminum and iron are used for Winch.
To protect these metals from corrosion, a galvanic anode system is employed. For anode,
an aluminum anode is used in order to offer high anti-corrosion effect, where the effect is
maintained as long as 5 years. To regularly monitor the anti-corrosion effect, the potential
between Reference Electrode and the metals is measured. In addition, degree of wear of
the anode is monitored with Camera.
Fig. 0.12 Aluminum anodes
Feature 6
Gripping Cable on Instrument Package
Some ways are available to grip the winch cable that is connected to Platform; for example, a
net is used, or upon disassembling the cable in its end portion only Kevlar fiber is gripped.
Such methods reduce payload due to length required for gripping. On this equipment, a
ring shape is employed to ensure sufficient payload. Gripping strength has been proved in
the tensile test at as high as 600kg, which is about 10 times the buoyancy of 60kg to
Instrument Package.
Fig. 13: Cable Grip Ring
8
Feature 7
Shape and Configuration of Instrument Package
Characteristics generally required for a Instrument Package is: small in size and light in
weight, many sensors to be deployed in well-balanced manner, projected area and
protrusion/ depression to be as small or few as possible so as not to be influenced by ocean
stream, and well-balanced rotation for not twisting the cable.
To accomplish these, Frame is structured by titanium, Float in copolymer form and Cover by
FRP. Float and Cover are split into 4 pieces, respectively.
Handle is mounted in each depression for easy maneuvering with manipulator of ROV.
Top and bottom are open for mounting optical measuring instrument, acoustic measuring
equipment and flow direction/velocity measuring equipment.
GYRO and GPS are mounted in the top center in order to detect attitude of Buoy, orientation,
acceleration and location when surfaced.
Fig. 0.14 Appearance of Instrument Package
9
Feature 8
Interface with Sensors
To suit a variety of power supply and communication specifications carried by mounted
sensors and to correspond to future expansion, Ether-Serial Isolation Unit has been
developed for this equipment. The below lists some of its functions.
- Sensor Supply Power： +5V，+6V，+12V，+15V，+24V，+30V 20W （Isolation)
- Interface：Input RS232C，RS422，RS485 （Isolation) Output 10/100Base-T Ethernet
- Monitoring：Voltage，Current，Ground Fault，Water Ingress（Isolated I2C bus）
- Error detection: Sensor connection line is shut off when Over Voltage, Over Current or
Ground Fault is detected.
Fifteen Ether-Serial Isolation Units are mounted on Instrument Package to isolate the power
supply and communication for each sensor.
Fig. 0.15 Appearance of Main Housing (Instrument Package)
Feature 9
Communication between Instrument Package and Platform
LAN connection between Instrument Package and Platform employs 10Mbps VDSL Modem.
For redundancy, the connection is configured by 2 pairs of such modems and the cable of
2TP-line. HUB is suitable for ring connection to ensure communication alive even when
either line of cables fails.
Instrument
Package
IP Network
VDSL x 2 line
Redundant Ring
Controller
HUB
HUB
HUB
Sensor
E/S
E/S
HUB
HUB
VDSL
VDSL
VDSL
VDSL
2 Switches &
2 VDSL modems
HUB
Platform
Sea bottom network
E/S
E/S
Ether/Serial
Controller
Fig. 0.16 Network Overview
10
Shore
Station