1、DO D- ST D-1399 (NAVY) ocSECTION 070 - PART 126 FEBRUARY 1979SUPERSEDINGMI L- ST D-1399 (NAVY)$ECTION 40111 JANUARY 1971MILITARY STANDARDINTERFACE STANDARD FORSHIPBOARD SYSTEMSSECTION 070 - PART 1D.C. MAGNETIC FIELD ENVIRONMENT_ (METRIC)O.FsC 1990Provided by IHSNot for ResaleNo reproduction or netwo
2、rking permitted without license from IHS-,-,-DoO_sTD-1399(NAvY)sECTION 070 - Part26 February 1979Interface Standard.1DEPARTMENT OF THE NAVYWASHINGTON, DC 20362Eor Shipboard SYf4tem8,D.c. Magnetic Field Environment -DOD-STD-1399(NAVY)SECTION 070 - Part 11. This Military Standard iB approved for use b
3、y all interested commands of theDepartment of the Navy i.nthe technical development plame. design, and acquisition specifi-cations for new ship acqulsi.tiona,ship modernizations or aonvereions,and equipment forinstallation therein and into active fleet ships where applicable, and is available for us
4、eby all Departments and Agencien of the Department of Defense.2. Beneficial comments (recommendations,additiom, deletionn) and any pertinent datawhich may be of use in improving thig dooumsnt should be addremed to: Commander, Naval ShipEngineering Canter, SEC 6124, Department of the Navy, Washington
5、 DC 20362, by using theself-addressedStandardization Document Improvement Proposal (DD Form 1426) appearing at theend of this document or by letter.iiProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Pm ose.+- hisconstra nts on, thesection defines the
6、design of shipboard.DOD-STD-1399(NAVY)SECTION 070 - Part 126 February 1979FOREWOROstandard interface requirementsequipment whose performance may . -. .fort and thebe degraded whensubjected to the shipboard direct current (d.C.)magnetic field environment.Nature of the interface. Equipment installed o
7、n board a Naval ship can expect toencou =g=ic field environment which would not be expected in other circumstances.This field is generated by the efforts (i.e., degaussing) to counteract the normal magneticsignature of a metallic Bhip, and may have a degrading effeCt on the Perfomnce of certainsusce
8、ptible equipment.Structure. The technical content first delineates the characteristicsin term of themagnetic fiel strength and distribution. The constraints on equipment design and installa-tion which are necessary to achieve shipboard compatibilitywith these characteristicsarethen established.Numer
9、ical quantities. Numerical quantities etated in this section are expreseed innwtric (S1) units.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-1399(NAVY)SECTION 070 - Part 126 February 1979CONTENTSParagraph“1JPage111111i:222222:2222333333:3 a
10、nd 4444156851.1.11.21.31.42,3.3.13.1.1.3.23.2.13,2.23.34.4,15.5.15.25.2.15.2.25.35.3.1GENERAL, SCOPE, INTERFACE, AND APPLICABILITYGeneral. . . . . . . . . . . . . . . .scope . . . . . . . . . . . . . . . . .Interface. . . . . . . . . . . . . . -Applicability . . . . . . . . . . . . . .*. . . . . . .
11、 . .*. a71 a11a15a15a15a11 a15a15 a15 a15a15a15a11 a15 a15 a15 a15 a15 a15 a15a71 a15 a15 a15a15a15a11 a15 a15 a15 a15 a15 a15a71 a11a15a15a11a11 a71 0 a71REFERENCED DCCUMENTS (Notapplicable). . . . . . .0 . . . . . . a71DEFINITIONS. . . . . . . . . . . . a71 . a71 a71 .ships d.c. magnetic field. .
12、 . . . .Magnetic field strength . . . . . . . .Dagaut3t3ing . . . . . . . . . . . . .Degaussing coil system. . . . . . . . .Magnetic treatment. . . . . . . . . . .EqUipMSnt. . . . . . . . . . . . . s .*.* . . .0 . .9 a71 *. . . . . . .*=* .*.*. a71 *. . .0 a71 0.0 .* . .* a71 *. . . . . . . . . . .
13、 . a71REQUIREMENTS. . . . . . . a71 . . . . . . a71 a71Requirements, . . . . . . . . . . . . .a71 a15 a15 a15 a15 a15 a15 a15a15a15a11a15 a15a15 a15 a15 a15 a15 a15 a15 a71 a15a15a11a15a15INTERPACECHARACTERISTICSAND CONSTRAINTS. .General considerations. . . . . . . . .Interfacecharacteristic . . . .
14、 . . .Field strength. . . . . . . . . . . . .Field distribution. . . . . . . . . . .Interfaceconstraints . . . . . . . . .Compatibility . . . . . . . . . . . . . . . . . . .0.0.0 *. . . . . . . .0. a71.*.* . *. .*. . . . . . . .a71 . . . . . a71 .*.* . . . . . . . .0. a71. . .0 a71 . . . . . a715.3.
15、25.3.2.15.3.2.25.3.2.35.3.2.45.3.3Location considerations . . . . . .Proximity to degaussing cable . . .Loaal magnetic fields . . . . . .Structural discontinvities. . . . .structural shielding. . . . . . . .special circumatancea . . . . , . . * a71 a11a15a11a15a15 a71 a15a11a15 a15 a15 a15 a15 a15 a
16、71 O a71 *. . . . . . .* . *a71 *. a71 .0. .*. .*. 0.00 a71 *. . . . . . Q.* . . .6.6.16.2PERFORMANCETESTING. . . . . . a71 . . . .Requirement. . . , . . . . . . . .rastprocedure . . . . . . . . . . .00 a71 *.* a71 *. . . . . . a71 0000= a71 *. . . . . . . *.* .s0DEVIATIONS, . . . . . . . . . . , .
17、 .Condition. . . . . . . . . . . . .Deviation proaedure . . . . . . . .7.7.17.1.1. 0 . . . . . . .0. . . . . . . a71 *.* . . . .0 .*.* a71 *.FIGURESFiqurea1234Interface. . . . . . . . . . . . . . . .Amperesformula . . . . . . . . . . . .Coil design. . . . . . . . . . . . . . .Equipment dimensions .
18、 . . . . . . . . .,0 . *.* a71 *O. . . . . . a71 *.* .*. . . . . . . . .0 a71 . .a71 *.*.* a71 *O* a71 *APPENDIXAppendixCoil Design Procedure and Criteria . . . . .*.* . . . . . . . .lVProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-1399(NAvY
19、)SECTION 070 - Part 126 February 19791. GENERAL, St.,E,INTERPACE AND APPLICABILITY1.1 Generzle P.litiiesand prGceduree establishedsection anheaic standard, i.e., DOD-STD-1399, aredocument.by DOD-STD-1399are mandatory. !l%imto be viewed as an integral single1.2 Scope. This section establiahee interfa
20、ce requirements for shipboard equipmentwhose performance mey be degraded when subjected to the ships d.c. magnetic field 0 ensurecompatibility between such equipment and the magnetic field environment.1.3 Interface. Basic characteristics and constraint categories concerned with thisinterface are sho
21、wn symbolically ! section 3, “Definitione.a,of DOD+TD-1399):on figure 1 (seeINTERFACE/ 1A4WIGNETICFIELD gi AFFECTEDEQUIPMENTENVIRONMENT10 I(d.c.)/ CHARACTERISTICSField strengthField distributiony-jBASIC CATEGORIESYFIGURS 1. Interfaoe.CONSTRAINTSCompatibilityLooationStructural shieldingThe particular
22、 interface characteristics and aonatraints pertinent to thim section aredescribed in 5.2 and 5.3.1.4 A Iicabi.lity. The criteria of thin section apply to equipment whose performancemay be deged when subjected to the magnetic fields defined herein. Such fieldswillnormally be experienced in uurface sh
23、ips and submarines which have a degaussing installation,and in all ships which are or may be subjected to magnetic treatmnt (see 3.2.2 and 5.3.3).2.Not3.3.1magneticREFERENCED DOCUMENTSapplicable.DEFINITIONSShL s d.c. ma netic fields.+ +A ships d.c. magnetic field is the quantity of1 nes of=ce exist
24、nq at a location in or on the ship at a given instant of time.3.1.1 Ma netic field stren th.+i=f,eMagnetic field strenqth is expressed in amperes parmeter (A/m) denqth in cg: system is the oersted (0s)which correspondsto one line of force per square centimeter (cmz)of area perpendicular to that line
25、 of force.One Oe is approximately equal to 80 A/m.3.2reducinqmagneticDegaussin. Oegaussing is the science dealinq with the methods and techniques ofa ships normal d.c. magnetic signature so that the possibilityof detection bymines and other magnetic influence detection devices I.sminimized.1Provided
26、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-I399(NAVY)SECTION 070 - Part 126 February 19793.2.1 De aussin- “coil system. A degaussing coil system is a system consistingofcontrol equipment an one or more coils of electrical cable installed at spec
27、ific locationson board ship for the purpose of reducing the ships d.c. magnetic siqnature, In operation,these coils are energized with d.c. so that the magnetic field produced is in oppositionto,and reduces, the magnetic field of the ship. Provision is made to vary the current throughthe coils in bo
28、th magnitude and polarity.3.2.2 Magnetic treatment. Degaus.singby magnetic treatment is a method of altering,reducing, or removing the permanent magnetic field of a ship. This is accomplishedbytemporarily rigging coils of electrical cable externally around the ship and about the ship,including the s
29、uperstructure where necessary, and energizing the coils with a sequence ofd.c. pulses of predetermined polarities and magnitudes. Dspermingm and “flashing”aretypes of treatment.(a) Deperming: The method of reducing the permanent magnetism of a ship byenergizing coils placed vertically around the shi
30、p.(b) Flashing: The method of altering the permanent magnetism of a ship byenergizing coils placed horizontally around the ship.3.3 E ui ment.+ Equipment, as referred to in this section, comprises those shipbcardcomponents, equ pmenta, and systems whose performance may be degraded when subjected to
31、amagnetic field environment as specified herein.4. REQUIREMENTS4.1 Requirements. The specific interface requirements and constraintsestablishedherein are mandatory and shall be adhered to by SYSCOMS, Project Managers, contractors,andall others engaged in any aspect of shipboard design to which these
32、 requirementsandconstraints apply including equipment design, production, and installation (seesection 4Requirements”of DOD-STD-1399).5. INTERPACE CHARACTERISTICS AND CONSTRAINTS5.1 General considerations. The shipboard magnetic field environment Is the summationof the magines of force existing in o
33、r about the ship. l%is field is not uniform andwill vary both in location and time. If this field is of sufficient magnitude in any giveninstance, it may have a degrading influence on the performance of equipment installedin oron the ship. Detailed knowledge of the exact installation location, as we
34、ll as a forecastof future changes, would be involved if a determination of equipment suitabilitywere to bemade on other than general environmental expectations. Equipment should be so designedandbuilt that it will not be adversely affected even in the “worst case” situationwhich cannormally be expec
35、ted. This situation will exist when the ship undergoee magnetictreatmentor operates with degaussing coils energized and is of a magnitude of 1600 A/m.5.2 Interface characteristics. The interfaoe characteristicsof the ships d.c.magnetic feld environment are described in 5.2.1 and 5.2.2 and may be exp
36、ected to be presentwhere the equipment interfaces with the shipboard d.c. magnetic field environment.Its M; bf%?v=;ources such as%(a) Electricalpower cablee.(b) Generators.(c) mtorB.(d) Welding circuits.(e) Electrical power switchb-cardsand control equipment.Locationof equipment in the Proximity of
37、those sources shall be judiciouslyaonaidered.5.3.2.3 Structuraldiacontinuities. Bulkheads or other steel structuralmembers(includingewlmnt) mzY act aa a return path for the magnetic flux lines, resulting in alocalizedconcentrationof the magnetic field. If there is a discontinuity (gape,openings,etc.
38、) in this return path, Lncreased field values maY be experienced in the vicinity ofthe discontinuity.When equipmnt is to be installed in the near vicinity of such a dis-continuity,the possible degrading effect of the enhanued magnetic field environment shallbe taken into account.or o&;”%!rc;i=t;=?;c
39、t tomFetic treaWnt atperiodic intervals. ThisCertain surface ships and submarineswhich do not havetreatment is accomplishedat docknidet and does not necessarily require equipment to bein an operating etatus during such treatment. The eseential requirement is that the equip-ment operate aatimfactoril
40、ywithin equipmenk apecifiaation requirementsin the preBence ofa residual field of 400 A/m after exposure to the magnetic treatment. In oertaincircumstances,therefore, it may not be practical or cost-effective to design specializedequipment to operate in the maximum expected field. In such caees, the
41、 need to deviatefrom the requirementof 5.3.1 shall be fully justified (see 7.L).6. PERFORMANCE TESTING6.1 Requirement. When it is considered neaensary to determinw if an equipment (see3.3) will meet the criteria of this section, performance tests shall be conducted. Suchshipboard equipment shall be
42、teBted by exposing it to both an ambient steady state magneticfield having a maximum magnitude of 1600 A/n and a magnetic field having a maximum rate ofchange of 1600 A/m par second. The minimum exposure to the steady state field shall be 5minutes. No particular orientation of the direction of the m
43、agnetic field may be assumed.Equipment ehall be tested in operating condition and the equipment performanceevaluated inthe preeence of the test field. Requirements for testing individualequipments shall bespecified in the individualequipment specification.6.2 Test procedure. A square or circular coi
44、l of electrical conductors large enoughto encircle equipment shall be provided (see appendix). In lieu of e sinqle coil,lielmholtzcoils may be used to satisfy the coil requirements. (Note: The criteria containedin the appendix are not applicable to the Helmholtz coils.) The coil shall contain enough
45、ampere-turneto develop a magnetic field of 1600 A/m at the center of the coil when thecoil iB energized by a source of power. The coil shall be calibrated for a 1600 A/m field3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-1399(NAVY)SECTION
46、070 - Part 126 February 1979in air, that is, without the equipment in the field. The source ofof providing a variable (singlePolarity) d.c. The equipment underpower shall be capabletest shall be positioned(a)(b)(c)(d)at the center of the coil and the test performed as followsIncrease the current in
47、the coil such that the equirment is sub+ected to amagnetic field that increamea frotnO to 1600 A/ at a relativelyconstantrate. The mximum applied field shall be no lese than 1600 A/m and thefield shall be increased at a rate between 1600 and 16,000 A/m per second.Maintain the field at 1600 A/m for 5
48、 minutes, or longer if necessary,toobtain sufficient operational data from the equipment to verify correctoperation. Decreaee the magnetic field from 1600 to O A/m at a rate between1600 and 16,000 A/m per second.Reverse the connections of the coil .othe power source, and repeat the testprocedure sta
49、ted in (a).Rotate the coil 90 degrees such that the plane of the coil iB perpendicularto the plane of the coil aa.described in (a), and repeat the test prccedureaa etated in (a) and (b). If more convenient, the equipment rather than thecoil may be rotated.Ftate the coil 90 degrees such that the plane of the coil is perpendicularto the Plane of the coil as described in both (a) and (c
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