1、BSI Standards Publication BS ISO 8728:2014 Ships and marine technology Marine gyro-compassesBS ISO 8728:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8728:2014. It supersedes BS EN ISO 8728:1999 which is withdrawn. The UK participation in its preparati
2、on was entrusted to Technical Committee EPL/80, Maritime navigation and radiocommunication equipment and systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract
3、. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN 978 0 580 79391 2 ICS 47.020.70 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the au
4、thority of the Standards Policy and Strategy Committee on 31 July 2014. Amendments issued since publication Date Text affectedBS ISO 8728:2014 ISO 2014 Ships and marine technology Marine gyro-compasses Navires et technologie maritime Compas gyroscopiques usage marin INTERNATIONAL STANDARD ISO 8728 T
5、hird edition 2014-08-01 Reference number ISO 8728:2014(E)BS ISO 8728:2014ISO 8728:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any me
6、ans, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Genev
7、a 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 8728:2014ISO 8728:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Construction 2 5 Performan
8、ce requirements . 4 5.1 Accuracy in latitudes up to 60 . 4 5.2 Interface 5 6 Type tests . 5 6.1 General . 5 6.2 Settling time test 5 6.3 Settle point error test 5 6.4 Settle point heading repeatability test . 5 6.5 Settling time on a Scorsby table . 6 6.6 Scorsby test 6 6.7 Intercardinal motion test
9、 . 7 6.8 Repeater accuracy test . 7 6.9 Speed correction test . 7 6.10 General requirement test . 8 6.11 Interface test 10 7 Marking .10 8 Information .10 Annex A (normative) Advice to ship surveyors for installation of gyro-compasses and repeater compasses on board ships .11 Annex B (informative) E
10、quivalent requirements in ISO 8728 and IMO Resolution .12 Bibliography .14BS ISO 8728:2014ISO 8728:2014(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is no
11、rmally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in
12、 the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular
13、the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this do
14、cument may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.
15、org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WT
16、O principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee SC 6, Navigation and ship operations. This third edition cancels and replaces the secon
17、d edition (ISO 8728:1997), which has been technically revised.iv ISO 2014 All rights reservedBS ISO 8728:2014INTERNATIONAL ST ANDARD ISO 8728:2014(E) Ships and marine technology Marine gyro-compasses 1 Scope This International Standard specifies the construction, performance, and type testing for gy
18、ro-compasses required by Regulation 12 of Chapter V of SOLAS 1974 (as amended). NOTE All requirements that are extracted from the recommendations of IMO Resolutions Resolution A.424(XI) on performance standards for gyro-compasses are printed in italics. 2 Normative references The following documents
19、, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 25862, Ships and marine te
20、chnology Marine magnetic compasses, binnacles and azimuth reading devices IEC 60945, Maritime navigation and radiocommunication equipment and systems General requirements Methods of testing and required test results IEC 61162-1, Marine navigation and radiocommunication equipment and systems Digital
21、interfaces - Part 1: Single talker and multiple listeners IEC 61162-2, Maritime navigation and radiocommunication equipment and systems Digital interfaces Part 2: Single talker and multiple listeners, high-speed transmission IEC 61924-2, Maritime navigation and radiocommunication equipment and syste
22、ms Integrated Navigation Systems (INS) Part 2: Modular structure for INS Operational and performance requirements, methods of testing and required test results IMO Resolution MSC.252(83), Performance standards for alert communications with an Integrated Navigation System IMO Resolution MSC.302(87),
23、Performance standards for bridge alert management 3 T erms a nd definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 gyro-compass complete equipment including all essential elements of the complete design, including both the gyro- compass as heading sensor a
24、nd the associated heading transmission system 3.2 true heading horizontal angle between the vertical plane passing through the true meridian and the vertical plane passing through the ships fore-and-aft datum line; it is measured from true north (000) clockwise through 360 Note 1 to entry: When the
25、gyro-compass equipment is not installed on board ship, this “true heading” is regarded as the true heading of the lubber line. Where a gyro-compass has the facility of introducing a correction by moving the lubber line, the correction is set for the local latitude. ISO 2014 All rights reserved 1BS I
26、SO 8728:2014ISO 8728:2014(E) 3.3 settled stable situation when any three readings taken at intervals of 30 min are within a band of 0,7, with the compass level and stationary Note 1 to entry: The settling time is the elapsed time between the time of switch-on at the initial heading error and the thi
27、rd recording of the settle. 3.4 settle point heading mean value of ten readings taken at 20 min intervals after the compass has settled as defined in 3.3 3.5 settle point error difference between the settle point heading as defined in 3.4 and the true heading 3.6 error difference between the observe
28、d value and the settle point heading as defined in 3.4 3.7 bearing repeater compass device that reproduces the master compass card at a remote location 3.8 compass card graduated dial of the compass which indicates the measured direction of the meridian 3.9 latitude error error to which some gyro-co
29、mpasses are subject, the magnitude and sign of which depend upon the local latitude Note 1 to entry: Means are provided for correcting this error. 3.10 speed error error to which gyro-compasses are subject, the magnitude and sign of which depend upon the speed, course, and latitude of the ship Note
30、1 to entry: Means are provided for correcting this error. 3.11 lubber line index line situated on the body of a compass against which the compass heading is read 3.12 master compass main compass unit which supplies the heading information to the repeaters and other navigational aids 3.13 scorsby tab
31、le test machine which independently oscillates a platform about three axes; it is used to simulate the motion of a ship 4 Construction Gyro-compass units shall conform to the following requirements.2 ISO 2014 All rights reservedBS ISO 8728:2014ISO 8728:2014(E) 4.1 The equipment shall be capable of c
32、ontinuous operation under conditions of vibration, humidity, change of temperature and variations of the power supply as specified in 6.10.1 to 6.10.5. 4.2 For those ships which are required to carry bearing repeater compasses, the construction of these shall be as follows. a) The bearing repeater c
33、ompass shall be designed to be fitted with an azimuth reading device. b) A gimbal mechanism shall be provided to enable the bearing repeater compass card to be held horizontally against the ships motion. c) Any bearing repeater compass intended for use on an open deck shall be waterproof. 4.3 The co
34、mpass card shall be graduated at equal intervals of 1 or fraction thereof. The graduation error shall be less than 0,2. A numerical indication shall be provided at least at every 10, starting from 000 clockwise through 360. 4.4 Fully adequate illumination shall be provided to enable the reading of a
35、ll compass cards at all times. Facilities for dimming shall be provided. 4.5 Both master compass and repeater compasses shall be provided with a lubber line to indicate the ships heading. 4.5.1 The base or some other fixed extremity of the compass shall be marked or identified in such a way as to fa
36、cilitate the installation of the compass in a ship, so that the lubber line lies in a vertical fore-and-aft plane of the ship. Where a gyro-compass has the facility of introducing a correction by moving the lubber line, the correction during installation shall be set to zero. If such marks or identi
37、fications are not in the same vertical planes as the uncorrected lubber line, then the horizontal angular relationship between them shall be clearly indicated. 4.6 Means shall be provided for correcting the errors induced by speed and latitude. Graphical or tabular means of correction can be used. 4
38、.7 Steps shall be taken to eliminate as far as is practical, the causes of and to suppress electromagnetic interference between the gyro-compass and other equipment on board. 4.8 Mechanical noise from all units shall be so limited as to ensure the hearing of sounds on which the safety of the ship ma
39、y depend. 4.9 The equipment shall be so constructed that it is readily accessible for maintenance purposes. 4.10 An automatic alert 1)shall be provided to indicate malfunctions of the system or a power failure in the gyro-compass. The alert shall conform to the presentation and handling requirements
40、 of Bridge Alert Management IMO Res. MSC.302(87). A suitable interface shall be provided for alert communications with an Integrated Navigation System IMO Res. MSC.252(83) and IEC 61924-2. The following sentences shall be provided for the alert communications interface: Sentences transmitted by the
41、gyro-compass: ALR, HBT: See IEC 61162-1; 1) The term “alarm” was replaced by “alert” in accordance with IMO Resolution MSC.252(83) and IMO Resolution MSC.302(87). ISO 2014 All rights reserved 3BS ISO 8728:2014ISO 8728:2014(E) ALC, ALF, ARC: See IEC 61924-2. Sentences received by the gyro-compass: AC
42、K, HBT: See IEC 61162-1; ACN: See IEC 61924-2. 4.11 Means shall be incorporated for the protection of the equipment from excessive currents and voltages, transients and accidental reversal of power supply polarity. 4.12 If provision is made for operating the equipment from more than one source of el
43、ectrical energy, arrangements for rapidly changing from one source of supply to the other shall be incorporated. 4.13 The gyro-compass shall be designed to enable heading information to be provided to other navigational aids. 5 Performance requirements 5.1 Accuracy in latitudes up to 60 5.1.1 Settli
44、ng time When switched on in accordance with the manufacturers instructions, the compass shall settle within 6 h. 5.1.2 Settle point error 5.1.2.1 The settle point error as defined in 3.5 at any heading shall not exceed 0,75 secant latitude, and the RMS value of the differences between individual hea
45、ding indications and the mean value shall be less than 0,25 secant latitude. 5.1.2.2 The repeatability of settle point error from one run-up to another shall be within 0,25 secant latitude. 5.1.3 Settling time under operational conditions When switched on in accordance with the manufacturers instruc
46、tions, the compass shall settle within 6 h when rolling and pitching with simple harmonic motion of any period between 6 s and 15 s, a maximum angle of 5, and a maximum horizontal acceleration of 0,22 m/s 2 . 5.1.4 Settle point error under general conditions The repeatability of the settle point err
47、or of the master compass shall be within 1 secant latitude under the general conditions and including variations in magnetic fields likely to be experienced in the ship in which it is installed. 5.1.5 Residual error in correction The residual steady-state error, after correction for speed and course
48、 influences at a speed of 20 kn, shall not exceed 0,25 secant latitude. 5.1.6 Effect of alteration of speed The error due to a rapid alteration of speed of 20 kn shall not exceed 2.4 ISO 2014 All rights reservedBS ISO 8728:2014ISO 8728:2014(E) 5.1.7 Effect of alteration of course The error due to a
49、rapid alteration of course of 180 at a speed of 20 kn shall not exceed 3. 5.1.8 Accuracy on a Scorsby table The transient and steady-state errors due to rolling, pitching, and yawing, with simple harmonic motions of any period between 6 s and 15 s, maximum angles of 20, 10, and 5 respectively, and a maximum horizontal acceleration not exceeding 1 m/s 2 , shall not exceed 1 secant latitude. 5.1.9 Synchronization between the master compass and repeaters Once the repeate
