© ISO 2013

Ships and marine technology — Guidelines for the assessment of speed and power performance by analysis of speed trial dataNavires et technologie maritime — Lignes directrices pour l’évaluation des performances de vitesse et de puissance par analyse des données d’essais de vitesse

Reference numberISO/DIS 15016:2013(E)

DRAFT INTERNATIONAL STANDARDISO/DIS 15016

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.

IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.

RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.

ISO/TC 8/SC 6 Secretariat: JISC

Voting begins on: Voting terminates on:2014-01-06 2014-04-06

[Revision of first edition (ISO 15016:2002)]

ICS: 47.020.01

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ISO/DIS 15016:2013(E)

ii © ISO 2013 – All rights reserved

Copyright notice

This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying, recording or otherwise, without prior written permission being secured.

Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s member body in the country of the requester.

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Reproduction may be subject to royalty payments or a licensing agreement.

Violators may be prosecuted.

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ISO/DIS 15016

© ISO 2013 — All rights reserved iii

Contents Page

Foreword .............................................................................................................................................................. v

Introduction ........................................................................................................................................................ vi

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

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

3 Terms and definitions ........................................................................................................................... 2

4 Responsibilities ..................................................................................................................................... 4 4.1 Ship builders’ responsibilities ............................................................................................................. 4 4.2 The trial team ......................................................................................................................................... 4

5 Trial preparations .................................................................................................................................. 5 5.1 Step 1: Installation & Calibration ......................................................................................................... 5 5.2 Step 2: S/P trial agenda and pre-trial meeting .................................................................................... 6

6 Ship condition ........................................................................................................................................ 6 6.1 Displacement ......................................................................................................................................... 6 6.2 Trim ......................................................................................................................................................... 7 6.3 Hull & propeller ...................................................................................................................................... 7

7 Trial boundary conditions..................................................................................................................... 7 7.1 Location .................................................................................................................................................. 7 7.2 Wind ........................................................................................................................................................ 7 7.3 Sea state ................................................................................................................................................. 8 7.4 Water depth ............................................................................................................................................ 8 7.5 Current .................................................................................................................................................... 9

8 Trial procedures ..................................................................................................................................... 9 8.1 Parameters that shall be logged .......................................................................................................... 9 8.2 Primary parameters ............................................................................................................................... 9 8.3 Secondary parameters ........................................................................................................................ 10 8.4 General information ............................................................................................................................. 10 8.5 Tank test information .......................................................................................................................... 10 8.6 Scope and conduct of the measurements ........................................................................................ 11 8.6.1 Ship track and speed over ground .................................................................................................... 11 8.6.2 Torque ................................................................................................................................................... 11 8.6.3 Wind ...................................................................................................................................................... 11 8.6.4 Water depth .......................................................................................................................................... 11 8.6.5 Waves .................................................................................................................................................... 11 8.6.6 Density and temperature ..................................................................................................................... 12 8.6.7 Current .................................................................................................................................................. 12

9 Trial executions ................................................................................................................................... 12 9.1 Initiation ................................................................................................................................................ 12 9.2 Trial trajectory ...................................................................................................................................... 12 9.3 Run duration& timing .......................................................................................................................... 13 9.4 Trial direction ....................................................................................................................................... 13 9.5 Steering................................................................................................................................................. 13 9.6 Approach .............................................................................................................................................. 13 9.7 Number of speed runs ......................................................................................................................... 13 9.7.1 Iterative method ................................................................................................................................... 13 9.7.2 Mean of means method ....................................................................................................................... 14

10 Data acquisition ................................................................................................................................... 14 10.1 General data ......................................................................................................................................... 14 10.2 Data on each run .................................................................................................................................. 15

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ISO/DIS 15016

iv © ISO 2013 — All rights reserved

10.3 Acquisition system ..............................................................................................................................15 10.3.1 Minimum data .......................................................................................................................................15 10.3.2 System requirements ..........................................................................................................................16 10.3.3 Location ................................................................................................................................................16 10.4 Manual data collection ........................................................................................................................16

11 Analysis procedure .............................................................................................................................19 11.1 General remarks...................................................................................................................................19 11.2 Description of the analysis procedure ..............................................................................................19 11.2.1 Resistance data derived from the acquired data ..............................................................................20 11.2.2 Evaluation of the acquired data .........................................................................................................20 11.2.3 Evaluation based on Direct Power Method .......................................................................................21 11.2.4 Correction of the ship speed due to the effect of current ...............................................................23 11.2.5 Correction of the ship speed due to the effects of shallow water. .................................................24 11.2.6 Correction of the ship performance due to the effects of displacement. ......................................24 11.2.7 Prediction of power curve from trial condition to full load/stipulated condition ..........................24

12 Processing of the result ......................................................................................................................24

13 Reporting ..............................................................................................................................................25

Annex A (normative) General ship and trial data .........................................................................................27

Annex B (normative) Beaufort scale for wind speed ...................................................................................28

Annex C (informative) Format S/P trial log sheet .........................................................................................30

Annex D (normative) Resistance increase due to wind ...............................................................................31 D.1 Evaluation of wind data .......................................................................................................................31 D.1.1 Averaging process for the true wind velocity and direction ...........................................................31 D.1.2 Correction for the height of anemometer ..........................................................................................33 D.2 Wind resistance coefficients ..............................................................................................................34 D.2.1 Wind tunnel test ...................................................................................................................................34 D.2.2 Data set on the wind resistance coefficient ......................................................................................34 D.2.3 Regression formula by Fujiwara et al. ...............................................................................................37

Annex E (normative) Resistance increase due to waves ............................................................................39 E.1 Theoretical method with practical correction ...................................................................................41 E.2 Empirical correction method with frequency response function for ships which heave and

pitch during the speed runs (STAWAVE-2) .......................................................................................46 E.3 Simplified correction method for ships that do not heave and pitch during the speed runs

(STAWAVE-1) .......................................................................................................................................48

Annex F (normative) Effect of water temperature and salt content ...........................................................50

Annex G (normative) Effect of current ...........................................................................................................52 G.1 Iterative method ...................................................................................................................................52 G.2 Mean of means method .......................................................................................................................54

Annex H (normative) Effect of shallow water ...............................................................................................56

Annex I (normative) Effect of displacement ..................................................................................................57

Annex J (normative) Conversion from trial condition to other stipulated load conditions .....................58

Annex K (informative) Derivation of load variation coefficients .................................................................60

Annex L (informative) Option analysis of direct power method .................................................................66 L.1 Propulsive efficiency correction ........................................................................................................66 L.2 Application of load variation test results ..........................................................................................71

Nomenclature ....................................................................................................................................................73

Abbreviations ....................................................................................................................................................77

Bibliography ......................................................................................................................................................78

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ISO/DIS 15016

© ISO 2013 — All rights reserved v

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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 15016 was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC 6, Navigation and ship operations.

This second edition cancels and replaces the first edition (ISO15016:2002), of which has been technically revised.

Annexes A, B, D, E, F, G, H, I and J form a normative part of this International Standard, while Annexes C, K and L are informative.

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ISO/DIS 15016

vi © ISO 2013 — All rights reserved

Introduction

This International Standard concerns the method of analysing the results obtained from speed trials.

The primary purpose of speed and power trials is to determine ship performance in terms of speed, power and propeller frequency of revolutions under prescribed ship conditions, and thereby verify the satisfactory attainment of the contractually and/or EEDI regulatory stipulated ship speed. Ship speed is that realized under the contractually and/or EEDI regulatory stipulated conditions which usually are no wind, no waves, no current, deep water, smooth hull and propeller surfaces.

Such stipulated conditions cannot normally all be expected to be met during the actual trials. In practice, certain corrections for the environmental conditions have to be considered, as for water depth, wind, waves and current.[2],[3],[4],[5],[8],[9]

The purpose of this International Standard is to define basic requirements for the performance of speed trials, and to provide procedures for evaluation and correction of speed trials covering all influences which may be relevant for the individual trial runs based on sound scientific grounds, thus giving confidence to the Owner with respect to the final results.

This International Standard is to help to reach the desired target precision of within 2% in shaft power and 0,1knots in speed.

The procedure specified in this International Standard has been derived largely on the basis of published data on speed trials and on ship performance, the more important among them being listed in normative annexes.

This international standard is to develop with the collaborative efforts made by ISO and ITTC to harmonize their standards on speed and power trial.

Substitution of terms clause

This international standard is generally applied to the ships which applied survey and certification on EEDI by IMO Resolution MEPC.214(63). In case of other ships which not applied above IMO resolutions, the term or phrase of this standard is deemed to be replaced as necessary. (e.g. “agreement between the Shipbuilder, the Owner and the Verifier” shall be read as “agreement between the Shipbuilder and the Owner” etc.)

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DRAFT INTERNATIONAL STANDARD ISO/DIS 15016

© ISO 2013 — All rights reserved 1

Ships and marine technology — Guidelines for the assessment of speed and power performance by analysis of speed trial data

1 Scope

The primary purpose of speed and power trials is to determine ship performance in terms of speed, power and propeller frequency of revolutions under prescribed ship conditions, and thereby verifying the satisfactory attainment of the contractually stipulated Ship Speed and to provide the Ship Speed for the verification of EEDI as required by (IMO).

This International Standard defines and specifies the following procedures to be applied in the preparation, execution, reporting and analysis of speed trials for ships, with reference to the effects which may have an influence upon the speed, power and revolutions relationship;

the responsibility of each party involved,

the trial preparations,

the ship’s condition,

the limiting weather and sea conditions,

the trial procedure,

the execution of the trial,

the measurements required,

the data acquisition and recording,

the procedures for the evaluation and correction,

the processing of the results.

The contracted ship speed and the speed for EEDI shall be determined for stipulated conditions which are defined at specific draughts (contract draught and/or EEDI draught). For EEDI, the environmental conditions are no wind, no waves, no current, deep water.

Normally, such stipulated conditions are not experienced during the actual trials. In practice, certain corrections for the environmental conditions, as for water depth, wind, waves, current and deviating ship draught have to be considered. For this purpose, not only the Shaft Power and Ship Speed are measured, but also relevant ship data and environmental conditions during the speed and power trials.

The applicability of this International Standard is limited to commercial ships of the displacement type.

In this International Standard, it was decided that the unit to express the amount of an angle should be “rad” (radian) and that the unit of speed should be “m/s” (metres per second). Nevertheless, “°” (degree) as a unit for an angle and “knots” as a unit for speed may be used. However, the units for the angles and speeds which appear in calculation formulas are to be “rad” and “m/s” without exception. Moreover, for the convenience of the users of this standard, numerical values using the units of degree and knots are stated jointly at appropriate places.

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