Technical Specifications of Surface Buoy

TSUNAMI WARNING SYSTEM Technical Specifications of Surface Buoy

Envirtech SpA Venice, 15th February 2011 Envirtech Code: 20003-SPE-200.0

Branches: Italy 31020 Vidor (TV) , 6/8 Via Sartori Italy 30030 Chirignago (VE) 2, Via S. Caterina e-mail info@envirtech.org web-site www.envirtech.com

This document or parts of it cannot be used for scopes not authorized by Envirtech SpA that will protect its rights.

Envirtech S.p.A. Cap. Sociale Euro 500.000 i.v. Italy 30175 Venezia Marghera (VE) 4/A, Via Pacinotti Phone +39 041 5313400 Fax +39 041 5313400 CCIAA VE 03852470107 - VAT: IT03852470107 Management Italy 17031 Albenga (SV) 69/2, Via Patrioti Phone +39 0182 559643 Fax +39 0182 570976

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TABLE OF CONTENTS

SYSTEM OVERVIEW.....................................................................................................................................3

1 SB ARCHITECTURE.......................................................................................................................................4

2 SB FUNCTIONALITIES................................................................................................................................10

3 TECHNICAL DESCRIPTION.......................................................................................................................11

4

4.1.1 Ballast and Mooring line specifications.................................................................................................11 4.1.2 Buoy Frame specifications....................................................................................................................11 4.1.3 Day and Night Signalling devices..........................................................................................................11 4.1.4 Autonomous Power supply system.........................................................................................................11 4.1.5 Electronic Housing...............................................................................................................................12 SATELLITE MODEM....................................................................................................................................13 SURFACE ACOUSTIC MODEM......................................................................................................................13

4.2 4.3

SB COMPLIANT TABLE..............................................................................................................................14

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1 SYSTEM OVERVIEW The Tsunami Warning System (TWS) designed by Envirtech is composed of the following main

subsystems:

• an Underwater Module (UM) to be installed at the sea bottom in open sea location for the

accurate measurement of the tide and the identification of anomalous conditions.

• a Surface Buoy (SB) moored close to the UM to receive via acoustic link the measurement

of UM to be transferred via satellite link to a Data Centre (DC) for visualization and

analysis.

• a Data Centre (DC) on land composed of hardware and software infrastructures for the

reception via satellite link of the data of SB and UM to be displayed, stored and analysed.

SATELLITE LINK

SB

DC

ACOUSTIC LINK

UM

Fig. 1.1 – Envirtech TWS Overview

The present document deals with the architectural, functional and performance specifications of

the Surface Buoy (SB).

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2 SB ARCHITECTURE The Surface Buoy (SB) system proposed is a SPAR buoy. Spar buoy is characterized by a tall and

thin configuration. It floats upright in the water and it is characterized by a small water plane and a

large mass. This configuration tends to be a stable ocean platform. Adjustment of the water plane

area and the mass allows spar buoys to be tuned so they tend to not respond to wave forcing.

The Envirtech SB is composed of 3 main parts:

- a subsurface pole;

- a buoyant (cone + cylinder) in the middle;

- a turret on the top.

The main advantages of this configuration for the specific applications are the following:

- the lower pole provide a reliable mechanical support of the acoustic modem and related

cable: the acoustic transducer can be mounted at least at 5-6m water depth to get a

reliable acoustic link.

- The buoyant can host on the top in the central part the battery and electronic unit with

related connectors.

- The turret on the top allows to mount the solar panels, the satellite modems and additional

devices like WiFi interface, meteorological station, etc.

- The hydrodynamic of the buoy proposed in characterised by small tilt movements: this

allows to get a vertical stable platform to optimise the performances of the acoustic link

between the buoy and the underwater module to get the data related to the tide and

tsunami detection.

A block diagram of the buoy proposed is reported in picture 2.1.

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cd SB Architecture

BUOY FRAME WITH SIGNALING DEVICES

GPS RECEIVER

AUTONOMOUS POWER SUPPLY SUBSYSTEM

SATELLITE MODEM

ELECTRONIC UNIT

HEADING & TILT SENSOR

METEOROLOGICAL STATIONS

WLAN MODEM

ACOUSTIC MODEM

MOORING LINE

BALLAST

Fg. 2.1 – SB Block Diagram

It is composed of the parts reported in the following table

Device/Component/Part Description

Mooring Line and Ballast

A line composed of a synthetic ropes, mechanical accessories and 4 tons metal block to anchor the buoy.

This parts requires a specific design taking into account the depth and the meteo- marine conditions of the specific installation site.

Envirtech can provide the mooring line with related design and dynamical analysis results.

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Buoy Frame with signaling devices

A spar buoy equipped with the signaling devices stated by IALA, IMO and IMA standards and regulations.

It integrates mechanically all the parts listed below in the present table.

Autonomous Power Supply Subsystem

A power supply system composed of solar panels, a battery charger with related control electronic and a lead gel battery pack.

Electronic Unit An electronic system integrated in a water proof case

Heading & Tilt Sensor A heading and tilt sensor to monitor the buoy movement, integrated in the Electronic Unit.

This part is optional and not included in the standard version

GPS Receiver A GPS receiver to monitor the buoy position at sea integrated in the Satellite Modem

Surface Acoustic Modem An acoustic modem installed at least at 5-6m under the buoy

Satellite Modem A satellite modem for the communication with the Data Centre on land.

WLAN Modem A device providing a broadband data link with the installation and maintenance ship

Meteorological Station

A set of meteorological sensors (temperature, humidity, pressure, wind speed and direction) with related acquisition electronic.

This part is optional and non included in the standard version

Drawings of the SB are reported hereinafter. It can be noted that the SB metal frame is equipped

with double supports for Satellite and Acoustic modems because on user request it is possible

to provide a redundant configuration. Anyway the standard version is without redundancy.

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3 SB FUNCTIONALITIES

The main functionalities provided by the SB are summarized hereinafter:

• Self monitoring of SB status data composed of

o Electronic unit diagnostic status (battery voltage and current, internal temperature,

pressure and water intrusion).

o Buoy position from GPS receivers and notification of SB OUT or INSIDE a circular

zone centred on the mooring point of the SB.

• Autonomous transmission of SB status data to the Data Centre (DC) every hour or 2

hours, 3 hours, 4 hours, 6 hours depending on the user settings. • Hourly logging of all SB status data in the internal mass memory. • Generation and transmission on request to the DC of the current SB status data. • Reception, execution and reply to settings commands or data request:

o change of the period of autonomous delivery to DC of the SB status data;

o ON/OFF of WiFi

o Test of SAT link.

o Current SB status request.

• Reception via Acoustic Transmission System (ATS) of the messages received by the

Underwater Module (UM) and forward of these messages to the satellite (SAT) modem. • Reception via SAT modem of the commands/data requests for UM and forward of these

messages to the ATS to be sent to UM.

• Provide a low level commands menu via test cable or WiFi interface to test each device

and component.

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4 TECHNICAL DESCRIPTION The specifications of the main components of the SB are reported in the following paragraphs.

4.1 Ballast and Mooring line specifications

The design depends to the installation site parameters and its water depth. It will be defined in the

detail design phase.

4.2 Buoy Frame specifications

The mechanical drawing of the buoy is reported in pictures 2.2 and 2.3. It is a spar type buoy able

to remain stable in vertical position and to support Beaufort 11. The buoy body is composed of a

central steel pole and a foam body having a diameter of 1.45 m.

The buoy weight is 2000 kg with a buoyancy of 2750kg.

All metal parts are zinc protected and epoxy painted (Metco-System).

4.3 Day and Night Signalling devices

1 day mark radar reflector;

1 marine light with independent battery and solar panel for a visibility up to 4 nautical miles;

Focal plane 3500mm.

4.4 Autonomous Power supply system

It is composed of 4 Solar Panel (Polycrystalline) 50W @12VDC each, and 4 Lead Gel

accumulators 110Ah @12VDC each. Each Solar panel has a dedicated charge controller to

optimise the efficiency of the whole system. The accumulators pack can supply the whole system

for more than 70 days in case of no sunny conditions.

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4.5 Electronic Housing

It is depicted in Fig 4.1

Fig 4.1 - Electronic Housing

Technical specifications:

• Box in Al and PTFE with 8 underwater connectors for

o Satellite Modems

o Acoustic Modems

o WiFi Box

o Power supply

• ENV-SB-ELE is dual and composed of

o CPU board

o Status board

o Switch board

o DC/DC board

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4.6 Satellite Modem

It is depicted in Fig 4.2

Fig 4.2 - Satellite Modem

Technical specifications:

• Inmarsat-C Message System • Built-In GPS Antenna (12 Channels) • RS232 Protocol • Message Transfer Rate: 600 bit/sec. • Message size: Max. 10 Kbytes. • Operating frequencies Rx: 1525.0 – 1559.0 MHz.* Tx: 1626.5 – 1660.5 MHz.* GPS: 1575.42 MHz.

4.7 Surface Acoustic Modem

It is shown in picture 4.3 below.

Fig 4.3 – Surface Acoustic Modem

Its main features are the following: - Spread spectrum modulation - Omnidirectional - Throughput of 5000 bps - Case designed for 200mwd

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5 SB COMPLIANT TABLE ID

Requirement Note

1 The buoy shall be spar type to minimize the tilt movements with the sea waves

2 The system buoy + mooring line shall be able to support Beaufort 11 of wind and sea wave conditions

Specific detailed design of the mooring line with related dynamical analysis verification shall be provided for each installation site.

The buoy shall be predisposed for a redundant configuration of the electronic system and the communication system (satellite and acoustic link)

5 The buoy shall have day and night signaling devices IALA compliant with a focal plan at least at 3m over the sea level.

The buoy shall be equipped with a short range wireless communication system useful for real time communication with a Laptop from the installation and maintenance ship.