ISO 15016:2002

INTERNATIONAL ISO
STANDARD 15016
First edition
2002-06-15
Ships and marine technology — Guidelines
for the assessment of speed and power
performance by analysis of speed trial data
Navires et technologie maritime — Lignes directrices pour l'évaluation des
performances de vitesse et de puissance par analyse des données
d'essais de vitesse
Reference number
©
ISO 2002
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©  ISO 2002
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ii © ISO 2002 – All rights reserved

Contents Page
Foreword.iv
Introduction.v
1 Scope .1
2 Terms and definitions .1
3 Symbols and abbreviations.1
3.1 Symbols.1
3.2 Abbreviations.5
4 Trial conditions .5
4.1 Wind .5
4.2 Sea state .5
4.3 Water depth .6
4.4 Current.6
5 Speed and power measurement .6
5.1 Runs.6
5.2 Steering.6
5.3 Measured and observed data .6
6 Analysis procedure .8
6.1 Flow of trial analysis .8
6.2 Evaluation of acquired trial data .12
6.3 Correction of ship performance for resistance increase .16
6.4 Correction of ship performance for current .18
6.5 Correction of ship performance for air resistance.20
6.6 Correction of ship performance due to shallow water effects.21
6.7 Final ship performance .21
7 Example of method of analysis.21
Annex A (normative) Resistance increase due to wind.28
Annex B (normative) Resistance increase due to waves .31
Annex C (normative) Effect of steering .38
Annex D (normative) Effect of water temperature and salt content .40
Annex E (normative) Effect of vessel condition .42
Annex F (normative) Effect of shallow water .43
Bibliography.45

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 3.
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 International Standard 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 9,
General requirements.
Annexes A to F form a normative part of this International Standard.
iv © ISO 2002 – All rights reserved

Introduction
This International Standard concerns the method of analysing the results obtained from speed trials.
The primary purpose of speed trials is to determine ship performance in terms of speed, power and propeller
revolutions under prescribed ship conditions, and thereby verify the satisfactory attainment of the contractually
stipulated ship speed. Ship speed is that realized under the contractually 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.
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 customer with respect to
the final results.
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 A to F.
INTERNATIONAL STANDARD ISO 15016:2002(E)

Ships and marine technology — Guidelines for the assessment of
speed and power performance by analysis of speed trial data
1 Scope
This International Standard specifies the procedure to be applied in analysing the results of speed trials for ships,
with reference to the effects which may have an influence upon the speed-power-revolutions relationship.
The applicability of this International Standard is limited to commercial ships of the displacement type.
The instrumentation to be used in the speed trials is not specifically indicated, nor is the method of conducting the
trials. Calibrated instruments and their methods of use commonly adopted for such trials should be acceptable.
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 “kn” (knot) 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 knot are stated jointly at appropriate places.
2 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
2.1
propeller pitch
design pitch for controllable pitch propellers
2.2
brake power
power delivered by the output coupling of the propulsion machinery before passing through any speed-reducing
and transmission devices and with all continuously operating engine auxiliaries in use
2.3
shaft power
net power supplied by the propulsion machinery to the propulsion shafting after passing through all speed-reducing
and other transmission devices and after power for all attached auxiliaries has been taken off
3 Symbols and abbreviations
3.1 Symbols
A : area of midship section under water
M
A: rudder area
R
A : area of maximum transverse section exposed to wind (area of portion of ship above waterline
XV
projected normally to the longitudinal direction of ship)
B : breadth, moulded, of ship
b: rudder span
R
C : wind resistance coefficient
AA
C : wind resistance coefficient in head wind
AA0
C: block coefficient
B
C : frictional resistance coefficient
F
C : total resistance coefficient
T
D: propeller diameter
f: frequency
F: Froude number
n
g : acceleration due to gravity
h: water depth
H : total wave height
H : significant wave height of seas
1/ 3
H : significant wave height of swell
S1/ 3
J : propeller advance ratio
k: wave number
K ψ : directional coefficient of wind resistance
( )
WR
K: torque coefficient
Q
K : torque coefficient of propeller converted from behind to open water condition
QO
K: thrust coefficient
T
L : length of ship between perpendiculars
pp
m : mass in general
n : propeller frequency of revolutions
P: propeller pitch
P: brake power
B
P: delivered power
D
P : shaft power (= 2 pnQ)
S
Q: shaft torque
2 © ISO 2002 – All rights reserved

R: resistance in general
R : resistance increase due to wind
AA
R : resistance increase due to displacement
ADIS
R : resistance increase due to temperature and salt content
AS
R: frictional resistance
F
R: total resistance
T
R : resistance increase due to waves
AW
R : resistance increase due to drifting
ββ
R : resistance increase due to steering
δδ
Sf : spectral density function of unidirectional waves
( )
S : real slip ratio
R
S : wetted surface area
W
t : thrust deduction fraction
T : period or temperature in general
T : average period from zeroth and first moment
T : average period from zeroth and second moment
T : mean wave period of seas
m
t : resistance deduction fraction due to steering
R
T : mean wave period of swell
Sm
T: water temperature
W
V : effective inflow velocity to rudder
eff
V: current velocity
F
V : ship's speed over the ground
G
V : ship's speed through the water
S
V : relative wind velocity
WR
V : true wind velocity
WT
w : Taylor wake fraction in general
β: drift angle
δ: rudder angle
R
∆: displacement force
∆R : total resistance increase
∆ r : response increase due to regular waves (=∆rr+∆ )
∆ r : resistance increase due to radiation in regular waves
∆r : resistance increase due to diffraction in regular waves
ζ: wave amp
...