Ships and marine technology — Determination of the shaft power of ship propulsion systems by measuring the shaft distorsion — Part 2: Optical reflection method

This document specifies a procedure to determine the shaft power of engine ships, by measuring the shaft distortion using an optical reflection type device. It gives the principles of the measurement, the components of the device and the calculation method. It also describes the factors for determining the measuring accuracy, including the calibration procedure, and specifies the on-board documentation for the device.

Titre manque — Partie 2: Titre manque

General Information

Status
Published
Publication Date
04-Jun-2019
Current Stage
6060 - International Standard published
Start Date
05-Jun-2019
Completion Date
05-Jun-2019
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ISO 20083-2:2019 - Ships and marine technology -- Determination of the shaft power of ship propulsion systems by measuring the shaft distorsion
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INTERNATIONAL ISO
STANDARD 20083-2
First edition
2019-06
Ships and marine technology —
Determination of the shaft power of
ship propulsion systems by measuring
the shaft distorsion —
Part 2:
Optical reflection method
Reference number
ISO 20083-2:2019(E)
ISO 2019
---------------------- Page: 1 ----------------------
ISO 20083-2:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, 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 ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 20083-2:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principles of the measurement ............................................................................................................................................................. 2

5 Components of the device ........................................................................................................................................................................... 4

5.1 General ........................................................................................................................................................................................................... 4

5.2 Mounting rings ........................................................................................................................................................................................ 5

5.3 Torsion meter ........................................................................................................................................................................................... 5

5.4 Reflecting mirror ................................................................................................................................................................................... 5

5.5 Transmitter ................................................................................................................................................................................................ 6

5.6 Receiver and power supply system ....................................................................................................................................... 6

5.7 Revolution sensor ................................................................................................................................................................................. 6

6 Calculation of the shaft power ................................................................................................................................................................ 6

6.1 Shaft torque ............................................................................................................................................................................................... 6

6.2 Shaft power ................................................................................................................................................................................................ 7

7 Factors for determining the measuring accuracy .............................................................................................................. 7

7.1 General ........................................................................................................................................................................................................... 7

7.2 Shaft diameter ......................................................................................................................................................................................... 7

7.3 G-modulus ................................................................................................................................................................................................... 7

7.4 Distance between mounting rings ......................................................................................................................................... 7

7.5 Thickness of the mounting ring ................................................................................................................................................ 7

7.6 Vibration of the shaft ......................................................................................................................................................................... 7

7.7 Zero adjustment ..................................................................................................................................................................................... 8

7.7.1 Zero point ............................................................................................................................................................................... 8

7.7.2 Procedure for zero adjustment............................................................................................................................ 8

7.8 Calibration .................................................................................................................................................................................................. 8

7.8.1 General...................................................................................................................................................................................... 8

7.8.2 Calibration procedure ................................................................................................................................................. 8

8 On-board documentation for the device ..................................................................................................................................... 8

Annex A (informative) Sample form of calibration results ........................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................10

© ISO 2019 – All rights reserved iii
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ISO 20083-2:2019(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 normally 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 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 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 document 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 .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 of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,

Subcommittee SC 2, Marine environment protection.
A list of all parts in the ISO 20083 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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ISO 20083-2:2019(E)
Introduction

Selecting the optimum rating of a ship’s main engine is important for ship owners, because it greatly

affects the expenses of operations, maintenance and management as well as the ship’s construction cost.

Measuring the output of the ship’s main engine is important for confirming the ship efficiency, as well

as for assessing the possible deterioration of the propulsion equipment or the accumulation of fouling

on the hull over time. There are many methods of measuring an engine’s output: (1) measuring the

distortion of the shaft, (2) determining the fuel consumption, and (3) observing engine indicators such

as cylinder pressure gauges.

Among these methods, ISO 20083 addresses the shaft distortion measurement with a shaft power

meter, a method commonly used as the principal measurement of engine power output.

The purposes of shaft power measurement are:
— to provide a measurement of the ship’s main engine output,
— to provide information regarding the ship’s most efficient speed,
— to select optimum engine operational characteristics,
— to estimate maintenance and repair costs, and
— to monitor heavy propeller running.
© ISO 2019 – All rights reserved v
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INTERNATIONAL STANDARD ISO 20083-2:2019(E)
Ships and marine technology — Determination of the shaft
power of ship propulsion systems by measuring the shaft
distorsion —
Part 2:
Optical reflection method
1 Scope

This document specifies a procedure to determine the shaft power of engine ships, by measuring the

shaft distortion using an optical reflection type device. It gives the principles of the measurement, the

components of the device and the calculation method. It also describes the factors for determining the

measuring accuracy, including the calibration procedure, and specifies the on-board documentation for

the device.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/s
3.1
shaft

propeller shaft or intermediate shaft that transmits the engine power to the propeller, and on which the

shaft power meter is installed
3.2
shaft torque

turning moment transmitted to the shaft that is generated by the engine to rotate the propeller

Note 1 to entry: It is expressed in new
...

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