ISO 9613-2:2024
(Main)Acoustics — Attenuation of sound during propagation outdoors — Part 2: Engineering method for the prediction of sound pressure levels outdoors
Acoustics — Attenuation of sound during propagation outdoors — Part 2: Engineering method for the prediction of sound pressure levels outdoors
This document specifies an engineering method for calculating the attenuation of sound during propagation outdoors in order to predict the levels of environmental noise at a distance from a variety of sources. The method predicts the equivalent continuous A-weighted sound pressure level (as described in ISO 1996-series) under meteorological conditions favourable to propagation from sources of known sound emission. These conditions are for downwind propagation or, equivalently, propagation under a well-developed moderate ground‑based temperature inversion, such as commonly occurs in clear, calm nights. Inversion conditions over extended water surfaces are not covered and may result in higher sound pressure levels than predicted from this document (see e.g. References [11] and [12]). The method also predicts a long-term average A‑weighted sound pressure level as specified in ISO 1996-1 and ISO 1996-2. The long-term average A‑weighted sound pressure level encompasses levels for a wide variety of meteorological conditions. Guidance has been provided to derive a meteorological correction based on the angular wind distribution relevant for the reference or long-term time interval as specified in ISO 1996-1:2016, 3.2.1 and 3.2.2. Examples for reference time intervals are day, night, or the hour of the night with the largest value of the sound pressure level. Long-term time intervals over which the sound of a series of reference time intervals is averaged or assessed representing a significant fraction of a year (e.g. 3 months, 6 months or 1 year). The method specified in this document consists specifically of octave band algorithms (with nominal mid-band frequencies from 63 Hz to 8 kHz) for calculating the attenuation of sound which originates from a point sound source, or an assembly of point sources. The source (or sources) may be moving or stationary. Specific terms are provided in the algorithms for the following physical effects: — geometrical divergence; — atmospheric absorption; — ground effect; — reflection from surfaces; — screening by obstacles. Additional information concerning propagation through foliage, industrial sites and housing is given in Annex A. The directivity of chimney-stacks to support the sound predictions for industrial sites has been included with Annex B. An example how the far-distance meteorological correction C0 can be determined from the local wind-climatology is given in Annex C. Experiences of the last decades how to predict the sound pressure levels caused by wind turbines is summarized in Annex D. The method is applicable in practice to a great variety of noise sources and environments. It is applicable, directly, or indirectly, to most situations concerning road or rail traffic, industrial noise sources, construction activities, and many other ground-based noise sources. It does not apply to sound from aircraft in flight, or to blast waves from mining, military, or similar operations. To apply the method of this document, several parameters need to be known with respect to the geometry of the source and of the environment, the ground surface characteristics, and the source strength in terms of octave band sound power levels for directions relevant to the propagation. If only A‑weighted sound power levels of the sources are known, the attenuation terms for 500 Hz may be used to estimate the resulting attenuation. The accuracy of the method and the limitations to its use in practice are described in Clause 9.
Acoustique — Atténuation du son lors de sa propagation à l'air libre — Partie 2: Méthode d'ingénierie pour la prédiction des niveaux de pression acoustique en extérieur
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FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 9613-2
ISO/TC 43/SC 1
Acoustics — Attenuation of sound
Secretariat: DIN
during propagation outdoors —
Voting begins on:
2023-10-16
Part 2:
Voting terminates on:
Engineering method for the prediction
2023-12-11
of sound pressure levels outdoors
Acoustique — Atténuation du son lors de sa propagation à l'air
libre —
Partie 2: Méthode d'ingénierie pour la prédiction des niveaux de
pression acoustique en extérieur
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 SUPPOR TING
DOCUMENTATION.
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Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 9613-2:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 1 ----------------------
ISO/FDIS 9613-2:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 9613-2
ISO/TC 43/SC 1
Acoustics — Attenuation of sound
Secretariat: DIN
during propagation outdoors —
Voting begins on:
Part 2:
Voting terminates on:
Engineering method for the prediction
of sound pressure levels outdoors
Acoustique — Atténuation du son lors de sa propagation à l'air
libre —
Partie 2: Méthode d'ingénierie pour la prédiction des niveaux de
pression acoustique en extérieur
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ISO/FDIS 9613-2:2023(E)
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LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
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DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
© ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023
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ISO/FDIS 9613-2:2023(E)
Contents Page
Foreword .iv
Introduction . vi
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, symbols and units . 2
3.1 Terms and definitions . 2
3.2 Symbols and units . 3
4 Source description .4
5 Meteorological conditions .6
6 Basic formulae . 7
7 Calculatio
...
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ISO TC 43/SC 1
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at 18 pt
Date: 2023-09-12xx
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Acoustics — Attenuation of sound during propagation outdoors — Part 2:
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Engineering method for the prediction of sound pressure levels outdoors
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Acoustique — Atténuation du son lors de sa propagation à l'air libre — Partie 2: Méthode
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d'ingénierie pour la prédiction des niveaux de pression acoustique en extérieur
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ISO/FDIS 9613-2:2023(E)
© ISO 2023
Commented [eXtyles1]: The reference is to a withdrawn
standard which has been replaced
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part
ISO 20344, Personal protective equipment — Test methods
of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or
for footwear
mechanical, including photocopying, or posting on the internet or an intranet, without prior written
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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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ISO copyright office
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Phone: +41 22 749 01 11
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Published in Switzerland
ii © ISO 2023 – All rights reserved
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ISO/FDIS 9613-2:2023(E)
Contents
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Source description . 4
5 Meteorological conditions . 6
6 Basic formulae . 6
7 Calculation of the attenuation terms . 8
7.1 Geometric divergence (A ) . 8
div
7.2 Atmospheric absorption . 9
7.3 Ground effect (A ) . 9
gr
7.3.1 General method of calculation . 9
7.3.2 Simplified method of calculation for A-weighted sound pressure levels . 12
7.4 Screening (A ) . 13
bar
7.4.1 General method of calculation . 13
7.4.2 Alternative method to calculate the path length difference z with one edge or with
more parallel edges . 17
7.4.3 Lateral diffraction around vertical edges . 19
7.4.4 Combining vertical and lateral diffractions and limitations . 20
7.5 Reflections . 20
7.5.1 General .
...
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