ISO 21984:2018
(Main)Ships and marine technology — Guidelines for measurement, evaluation and reporting of vibration with regard to habitability on specific ships
Ships and marine technology — Guidelines for measurement, evaluation and reporting of vibration with regard to habitability on specific ships
ISO 21984:2018 gives guidelines for the measurement, evaluation and reporting of vibration with regard to habitability for all persons on board ships satisfying one or both of the following conditions: a) 2-stroke cycle, long-stroke, low-speed diesel engine directly coupled to the fixed-pitch propulsion propeller is installed. b) length of deck house (L) is limited as compared with its height (H) (i.e. deck house of around 1,0 and above in slenderness ratio of H to L). An example of length of deck house (L) and its height (H) for slenderness ratio is shown in Annex A. Overall frequency-weighted r.m.s. vibration values in the frequency range 1 Hz to 80 Hz are given as guidance values for different spaces on ships. ISO 21984:2018 is applicable to specific ships with intended voyages of 24 h or more. ISO 21984:2018 specifies requirements for the instrumentation and the procedure of measurement in normally occupied spaces. It also contains analysis specifications and guidelines for the evaluation of ship vibration with respect to habitability. This document is not applicable to machinery spaces, other than engine control rooms, where persons do not stay for prolonged periods of time. ISO 20283‑5 is generally applicable to all ships. Requirements for measurement, evaluation and reporting of vibration with regard to habitability for all persons on board passenger and merchant ships, including specific ships to which this document may also be applicable can be found in ISO 20283‑5. This document is neither complementary nor additional but supplementary to ISO 20283‑5. The shipbuilder can select either this document or ISO 20283‑5 to apply to any specific ship upon due consideration to individual design conditions of the ship and, if any, experience in building sister or similar ships, and that particular selection is intended to be agreed on by the shipowner. The evaluation of low-frequency ship motion which can result in motion sickness is covered by ISO 2631‑1. For the evaluation of the global structural vibration of a ship, however, see ISO 20283‑2.
Navires et technologie maritime — Lignes directrices pour le mesurage, l'évaluation et l'établissement de rapports des vibrations affectant l'habitabilité à bord des navires spéciaux
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 21984
First edition
2018-02
Ships and marine technology —
Guidelines for measurement,
evaluation and reporting of vibration
with regard to habitability on
specific ships
Navires et technologie maritime — Lignes directrices pour le
mesurage, l'évaluation et l'établissement de rapports des vibrations
affectant l'habitabilité à bord des navires spéciaux
Reference number
ISO 21984:2018(E)
©
ISO 2018
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ISO 21984:2018(E)
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© ISO 2018, Published in Switzerland
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ii © ISO 2018 – All rights reserved
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ISO 21984:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Instrumentation . 2
4.1 General requirements . 2
4.2 Functional test . 3
5 Measurement locations and directions . 3
5.1 Measurement locations . 3
5.2 Measurement directions . 3
6 Measurement conditions . 3
7 Measurement procedure . 4
8 Evaluation . 4
8.1 Guidance values of acceptable vibration . 4
8.2 Beating . 5
9 Test report . 5
Annex A (informative) Example of length of a deck house (L) and its height (H) for
slenderness ratio . 6
Annex B (informative) Frequency weighting, W . 7
m
Annex C (informative) Example of report for evaluation of habitability on board ships in
accordance with this document . 9
Bibliography .10
© ISO 2018 – All rights reserved iii
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ISO 21984:2018(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 on 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 the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
iv © ISO 2018 – All rights reserved
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ISO 21984:2018(E)
Introduction
Shipboard vibration that interferes with duties or reduces comfort is objectionable and often results in
adverse comments from crew and passengers. To quantify this vibration, this document gives guidelines
for the measurement, evaluation and reporting of habitability for all persons on board specific ships
including crew.
Vibration data acquired in accordance with this document are also useful for
— comparison with ship specifications,
— comparison with other ships, and
— further development and improvement of vibration regulations.
© ISO 2018 – All rights reserved v
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INTERNATIONAL STANDARD ISO 21984:2018(E)
Ships and marine technology — Guidelines for
measurement, evaluation and reporting of vibration with
regard to habitability on specific ships
1 Scope
This document gives guidelines for the measurement, evaluation and reporting of vibration with regard
to habitability for all persons on board ships satisfying one or both of the following conditions:
a) 2-stroke cycle, long-stroke, low-speed diesel engine directly coupled to the fixed-pitch propulsion
propeller is installed.
b) length of deck house (L) is limited as compared with its height (H) (i.e. deck house of around 1,0
and above in slenderness ratio of H to L). An example of length of deck house (L) and its height (H)
for slenderness ratio is shown in Annex A.
Overall frequency-weighted r.m.s. vibration values in the frequency range 1 Hz to 80 Hz are given as
guidance values for different spaces on ships.
This document is applicable to specific ships with intended voyages of 24 h or more.
This document specifies requirements for the instrumentation and the procedure of measurement in
normally occupied spaces. It also contains analysis specifications and guidelines for the evaluation of
ship vibration with respect to habitability.
This document is not applicable to machinery spaces, other than engine control rooms, where persons
do not stay for prolonged periods of time.
ISO 20283-5 is generally applicable to all ships. Requirements for measurement, evaluation and
reporting of vibration with regard to habitability for all persons on board passenger and merchant ships,
including specific ships to which this document may also be applicable can be found in ISO 20283-5. This
document is neither complementary nor additional but supplementary to ISO 20283-5. The shipbuilder
can select either this document or ISO 20283-5 to apply to any specific ship upon due consideration to
individual design conditions of the ship and, if any, experience in building sister or similar ships, and
that particular selection is intended to be agreed on by the shipowner.
The evaluation of low-frequency ship motion which can result in motion sickness is covered by
ISO 2631-1. For the evaluation of the global structural vibration of a ship, however, see ISO 20283-2.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2041, Mechanical vibration, shock and condition monitoring — Vocabulary
ISO 2631-1, Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration —
Part 1: General requirements
ISO 2631-2, Mechanical vibration and shock — Evaluation of human exposure to whole-body vibration —
Part 2: Vibration in buildings (1 Hz to 80 Hz)
ISO 8041, Human response to vibration — Measuring instrumentation
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ISO 21984:2018(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2041 and the following 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 https:// www .electropedia .org/
3.1
accommodation space
space intended for recreational and administration use, namely cabins including day and sleeping
rooms, hospitals, mess rooms, recreation rooms
Note 1 to entry: Examples of recreation rooms are lounges, smoke rooms, cinemas, gymnasiums, libraries, hobby
rooms and game rooms.
3.2
office
space or room for carrying out a ship’s business
EXAMPLE Deck office, ship office, meeting rooms.
3.3
work space
space allocated predominantly for manual work, namely workshops, laundries, galleys and laboratories,
but not machinery space (3.4)
3.4
machinery space
space which contains steam or internal-combustion machinery, pumps, air compressors, boilers, oil fuel
units, major electrical machinery, oil filling stations, thrusters, refrigerating, stabilizing, steering gear,
ventilation and air conditioning machinery, etc., and tr
...
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