degaussing system

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Degaussing SystemDEG COMP MOD 2


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What you should know about us

Degaussing System

In it´s marine-oriented lines of business SAM

Electronics specialises in state of the art electrical

and electronic systems for naval- and commercialvessels. These lines of business currently

comprise:

n Marine communication- and navigation

systems,

n Integrated machinery control and

n Monitoring systems,

n Marine electrical power and drive systems

n Magnetic systems.

In the area of magnetic systems the scope of

supply and services offered by SAM Electronics to

navies and shipyards world-wide includes

advanced degaussing systems for deployment on

surface combatants, mine counter measure

vessels, submarines and auxiliary vessels.

Headquarters Hamburg

In addition to degaussing systems the planning,

design and delivery of fixed and mobile magnetic

ranges and of demagnetisation facilities for shipsand ship equipment complete SAM Electronics´

comprehensive range of supplies and services in

the area of magnetic systems.


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General

Sea mines equipped with magnetic influence

firing systems are effective and inexpensive

underwater weapons. They are easy to deploy in

large numbers against naval and commercial ship

targets and constitute a formidable threat, both

physically and psychologically.

Thus effective measures for magnetic signature

management are required to protect vesselsagainst the threat from sea mines, fitted with

modern magnetic influence firing systems.

To this date, advanced state of the art degaussing

systems are the most effective means of ship

protection against modern sea mines. They

reduce the magnetic interference field of vessels

to acceptable levels, as required for the fulfilment

of their mission. This effectively limits their

endangerment during combat and in wartime

cruising.

Reduction of Magnetic InterferenceField by Degaussing

protected vessel

unprotected vessel

mine


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Scope of Supplies and Services

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Supplies and ServicesSAM Electronics can look back to many years of

experience in ship degaussing systems. To this

date more than 200 systems of various designs

and configurations have been supplied to the

Federal German Navy and to other Navies world-

wide. A list of references indicating SAM

Electronics track record in degaussing systems, is

attached.

On the basis of the SAM Electronics degaussing

system „DEG COMP MOD 2“, a family of efficient

and reliable Degaussing Systems has been

introduced suitable for deployment on all

types of naval vessels. The system - proven and

qualified according to the standards of the

Federal German Navy - is already successfully in

service with several navies, including the Federal

German Navy.

Technical Customer SupportIn addition to the supply of hard- and software

for Degaussing Systems, SAM Electronics offers a

comprehensive package of technical and logistic

support, including:

n Magnetic signature management,

n Support for magnetic ranging, demagnetisation

treatment and system calibration

n Integration assistance

n Integrated logistic support

Magnetic SignatureManagementComprehensive expertise and know how is

available at SAM Electronics for the design of

degaussing coil systems, which is carried out

with the aid of advanced CAD modelling

techniques. These are aimed at optimising the

coil design and allow the prediction of the

magnetic signature of the vessel on the basis ofthe ship design data and the subsequent

degaussing coil layout.

In connection with the relevant ship data, the

available design tools also allow the immediate

verfication of design changes made to the vessel

and the coil configuration.

SAM Electronics is able to carry out degaussing

coil design for a variety of vessels and is prepared

to accept the overall responsibiliy for their

magnetic performance.

Degaussing System

Input of Coil Parameters


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Support for Magnetic Rangingand Degaussing SystemCalibrationSAM Electronics´ experts are available, to provide

technical support before and during ranging and

magnetic treatment of the vessel and to assist

during the calibration of the degaussing system

on the customer’s magnetic range.

Assistance for SystemIntegrationIn order to allow the successful implementation

of the degaussing system under shipbuilding

aspects and to ensure the magnetic performance

of the vessel, SAM Electronics assists customers

by providing extensive guidelines for equipment

and coil installation. Installation drawings,

prepared by the yard will be reviewed for

compliance with the degaussing coil design.

Integrated Logistic SupportSAM Electronics offers and implements extensive

ILS packages for the life cycle support of the

degaussing system. They include maintenance

planning, optimised material support , technical

documentation, operator and maintainer

training and after sales services.

Interference Field of the Degaussed Ship


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System Features of DEG COMP MOD 2

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Degaussing System

The SAM Electronics degaussing system „DEG

COMP MOD 2“ is a versatile degaussing system,

suitable for deployment on all classes of naval

vessels.

It is capable to compensate the permanent and

induced and - in it´s maximum configuration -

also the eddy current magnetic interference

fields of naval vessels to specified targetsignatures.

It´s non magnetic design allows deployment also

on Mine Countermeasure Vessels (MCMV) and on

non magnetic submarines.

The „DEG COMP MOD 2“ system is a modular,

decentralised, computer controlled degaussing

system, which works on the „sum current

principle“ i.e. at any given moment during

operation of the system, each degaussing coil

carries the aggregate current load as required

for compensation of the permanent, induced and

- if required - the eddy current content of the

magnetic interference field.

This necessitates separately controllable power

supplies for the individual degaussing coils,

which are provided by independent power

amplifiers.

The system features selectable automatic control

in master - slave mode, with inputs coming either

from a triaxial magnetic probe system or from the

ship´s navigation system. In emergency mode,

control can alternatively be effected by manually

entering the relevant control data.

The system offers a user- friendly Man Machine

Interface (MMI) with data input and monitoringvia display , keyboard and softkeys. Hierarchically

organised menus for interactive control are

provided for the different operational modes.

Navigation

SystemGyro

Compass

Control Unit

Probe

Amplifier / DPU nAmplifier / DPU 1


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System Configuration

Degaussing Control Unit (DCU)Heart of the system is the computer based

Degaussing Control Unit (DCU), which accommo-

dates the MMI and interfaces to the other main

system components. For control and monitoring,

standard interfaces are provided.

In automatic mode the DCU receives the actualmagnetic earth field data either from the

magnetic probe system or by calculations derived

from a geophysical model as data base and inputs

from the vessels´ navigation system. To this end

the DCU is equipped with a suitable memory,

which contains the algorithms of the geo-

physical model for generation of the magnetic

earth field data. In emergency mode the

navigation data can be input manually.

At any given moment the system automatically

calculates the required sum current for each

degaussing coil, which is composed of thepermanent-, induced- and in it´s maximum

configuration also the eddy current content.

On the basis of this calculation each degaussing

power amplifier generates the required DC sum

current to feed the related connected coil. Menu

controlled interactive communication between

the user and the DCU is effected via a display with

attached keyboard and functional softkeys.

Error messages are generated in case specified

limits are exceeded, or undesired operationalconditions prevail.

Bridge Control Unit (BCU)In addition to the MMI, which is an integral part

of the DCU, and serves as the primary control and

monitoring post for the degaussing system, the

bridge control unit is provided either as an option

for remote control and monitoring or as a fully

redundant back up facility to the MMI. In a

variant the BCU is also available as a small LCDpanel for the manual input of the navigation data

and alarm indication.The units are intended for

integration into the bridge control console.

Magnetic Probe SystemThe Magnetic Probe System serves for

acquisition of the magnetic earth f ield, related to

the vertical, athwartship, and longitudinal

directions of the vessel. The probe is aligned to

the vessel´s coordinates by means of software

feature, forming part of the DCU software.

Degaussing Control Unit

Tri-Axial Magnetic Probe (cover removed)


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System Configuration

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Degaussing System

Degaussing Power SupplyDepending on the respective type of vessel the

DEG COMP MOD 2 system makes use of two

different coil supply concepts:

n The centralised coil supply concept, which is

intended for vessels having a low power

demand per coil e.g. MCMVs and non

magnetic submarines. This allows the power

amplifiers for the individual degaussing coils

to be arranged in a centrally located amplifier

cabinet.

Degaussing Power Unit

n The decentralised coil supply concept, which is

intended for vessels having a higher power

demand per coil e.g. ferromagnetic surface

combatants and supply vessels. They make

use of individual Degaussing Power Amplifier

Units (DPU) arranged near the connected coil.

Both power supply concepts use a family of

current controlled amplifiers of differentconfiguration and power rating, each suitable for

the direct supply of the respective sum current to

the connected degaussing coil.

The robust and compact power amplifiers

intended for use with the centralised power

supply concept are available in the power range

between 60 W and 500 W. They are designed as

modular plug – in units, and accommodated

in a common amplifier cabinet. Degaussing

Degaussing Amplifier Cabinet (for non-magnetic ships) Degaussing Amplifier Cabinet (for ferro-magnetic ships)

systems for ferromagnetic vessels, utilising the

decentralised power supply concept, use a

number of degaussing power amplifier units

(DPU) to energise the connected degaussing

coils. The DPUs are designed as stand alone

equipment. The units are of identical design, and

deviate only with regard to their power rating.

Typical output power ratings are in the area of 3to 5 KW per unit. Depending on the coil design

maximum power ratings of approx. 9 KW are

feasible for standard 440 V mains. A group of

DPUs is interfaced to an upstream section

transformer serving for voltage adaptation and

potential separation. Each DPU interfaces to the

Degaussing Control Unit for commands, set

values and for a feed back of the actual values.

The DC output power of the DPUs feeds the

connected coils via smoothing chokes.


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Automatic modeControl of the degaussing system is normally

effected in automatic mode, using the magnetic

earth field data related to the ships co-ordinates

as control parameters. For automatic mode of

control, the DCU accepts two freely selectable

independent inputs for the magnetic earth field

data coming from separate data sources:

n Magnetic earth field data from the magnetic

probe system

nMagnetic earth field data derived from calcu-

lations on the basis of a geophysical model

and the actual geographic ships position,

heading and roll and pitch angles, which are

obtained from the vessel´s navigation system.

The operator may select each of the data sources

as master, while the other will automatically be

configured as slave. During operation both sour-

ces are constantly monitored for plausibility. In

case of a non admissible deviations between thetwo data sources, the system initiates a self - test

for fault identification and selects the correct

data source, which will automatically be conver-

ted to master. The faulty data source will be

disconnected.

When automatic mode is selected the system

automatically provides the set values for the

power amplifiers on the basis of the actual earth

field data - obtained from either of the two data

sources - under consideration of compensation

coefficients.

Modes of Control

By assigning individual coefficients to each power

supply unit rated set values for compensation of

the induced and permanent magnetization are

established. By summation of the rated set values

for the induced and permanent content, common

set values are derived, which serve as reference

for the output sum currents of the power supply

units. The set values will be generated individually

for each power supply unit employed.

Degaussing Control Unit (DCU) - main menu


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Modes of Control

Degaussing System

Advantages of DEG COMP 2In comparison to conventional degaussing

systems the SAM Electronics degaussing

system DEG COMP MOD 2 offers the following

system inherent advantages :

n Optimised power consumption by the

application of the sum current principle

i.e. the use of common coils for compen-sation of the vessels total magnetic

interference field.

n Reduced quantity of coil cables and

subsequent reduction of weight and cost

for cables and cable installation.

n Improved system reliability, availability

and maintainability due to increased

numbers of independent coil amplifiers

and independent control sources.

n Improved capability for integration due

to small dimensions of the system

components and the possibility to useindependent control data sources. The

application of the magnetic probe system

can be deleted if the installation of the

tri-axial probe is not feasible - as on

submarines - and the function of the

probe is replaced by the geophysical

model and support from the navigation

system.

n Improved capability for magnetic cali-

bration of the Degaussing system during

ranging. Input of coefficients at the MMI

of the Degaussing Control Unit instead of

wiring changes at the Degaussing switch

boxes of conventional systems.

In cases where eddy current compensation is also

required, the additional output sum current of

the power amplifiers is calculated in the same

manner as described for the permanent and

induced portions. The compensation coefficients

will be established during a first calibration

ranging of the vessel or after check rangings

during its service life.

The actual operating data of each power

amplifier unit, such as the output voltage and

output current are continuously sensed and

transmitted back to the DCU. These actual data

are monitored and compared with the set

values. In case of inadmissible deviations, the

DCU generates alarms for presentation on the

display of the degaussing control unit and on the

bridge control unit.

Manual ModeThe manual mode is intended as a back-up for

the automatic mode, in the event that the probe

and the navigation system are out of order. In

this mode the DCU receives the information

concerning position and heading of the vessel by

operator input via the MMI. The DCU calculates

the required coil currents on the basis of the

geophysical model and provides setting data to

the power amplifiers same as in automatic mode.

Degaussing Control Unit (DCU) - settings menu


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Reference List

Customer Type of Vessel Quantity Type

FRG Navy Destroyer Class 101 4 DEG ROT

FRG Navy Frigate Class F122 8 DEG ROT

FRG Navy Frigate Class F123 4 DEG ROT

FRG Navy Submarine Class 202 2 DEG ROT

FRG Navy Minesweeper Class TROIKA 6 DEG ROT

FRG Navy Minesweeper Class SM 343 10 DEG STAT

FRG Navy Minesweeper Class MJ 332 12 DEG STAT

FRG Navy Fast Patrol Boat Class S 143 A 10 DEG ROT

FRG Navy Landing Craft Class 521 13 DEG ROT

FRG Navy Survey Ship Class 753 3 DEG ROT

FRG Navy Task Force Supply Vessel Class 702 2 DEG COMP

FRG Navy Frigate Class F124 3 DEG COMP

FRG Navy Submarine Class 212 4 DEG COMP

FRG Navy Task Force Supply Vessel Class 702 2 DEG COMP

FRG Navy Corvette Class K 130 5 DEG COMP*

Australian Navy Frigate 10 DEG ROT

Bangladesh Navy Frigate 1 DEG ROT

Brazilian Navy Frigate 5 DEG STAT

Hellenic Navy Frigate 4 DEG ROT

Indian Navy Corvette 7 DEG ROT

Indian Navy Frigate Class P 15 3 DEG ROT

Indian Navy Frigate Class P 17 3 DEG COMP

Indian Navy Frigate Class P 15 A 3 DEG COMP*

Italian Navy Submarine Class 212 A 2+2 DEG COMP*Malaysian Navy Corvette 2 DEG ROT

Malaysian Navy Hydrographic Vessel 1 DEG ROT

Malaysian Navy Hydrographic Vessel 1 DEG COMP

Malaysian Navy Offshore Patrol Vessel 6 DEG COMP

Portuguese Navy Frigate 3 DEG ROT

Portuguese Navy Submarine 2+1 DEG COMP

ROK Navy Frigate 9 DEG ROT

ROK Navy Frigate 4+2 DEG COMP

ROK Navy Destroyer 1 DEG COMP

ROK Navy Corvette 28 DEG ROT

*Contract under processing


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P r i n t e d i n G e r m a n y • T e c h n i c a l a l t e r a t i o n s r e s e r v e d •

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A M E l e c t r o n i c s G m b H • D S 1 . 0

5 4 . 0

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SAM Electronics GmbH

Drives and Special Systems

Behringstrasse 120

22763 Hamburg . Germany

Phone: +49 (0)40 - 88 25 - 27 69

Fax +49 (0)40 - 88 25 - 41 11

[email protected]

www.sam-electronics.de

Degaussing SystemReference List

Customer Type of Vessel Quantity Type

ROK Navy Minehunter 6 DEG STAT

ROK Navy Submarine Rescue Vessel 1 DEG ROT

ROK Navy Amphibious ship 1 DEG COMP

South African Navy (RSA) Frigate 4 DEG COMP

Thai Navy Minehunter 2 DEG COMP

Thai Navy Minehunter 2 DEG STAT

Turkish Navy Fast Patrol Boat 2 DEG COMP

Turkish Navy Minehunter 6 DEG COMP

UAE Navy Corvettes 4+2 DEG COMP*

Spanisch Navy Submarine 4 DEG COMP*

ROK Navy Salvage and Rescue Ship 1 DEG COMP*

ROK Navy Figate FFX 1+2 DEG COMP*

UAE-Navy Retrofit Minehunter 2 DEG COMP*

FRG Navy Frigate F125 4 DEG COMP*

FRG Navy Task Force Supply Vessel Class 702 (2 Batch) 1 DEG COMP*

*Contract under processing

degaussing system

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