oSIST prEN ISO 9613-2:2024
(Main)Acoustics - Attenuation of sound during propagation outdoors - Part 2: Engineering method for the prediction of sound pressure levels outdoors (ISO 9613-2:2024)
Acoustics - Attenuation of sound during propagation outdoors - Part 2: Engineering method for the prediction of sound pressure levels outdoors (ISO 9613-2:2024)
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 d
Akustik - Dämpfung des Schalls bei der Ausbreitung - Teil 2: Verfahren der Genauigkeitsklasse 2 (Ingenieurverfahren) für die Vorhersage der Schalldruckpegel im Freien (ISO 9613-2:2024)
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 (ISO 9613-2:2024)
Akustika - Slabljenje zvoka pri širjenju na prostem - 2. del: Inženirska metoda za napovedovanje ravni zvočnega tlaka na prostem (ISO 9613-2:2024)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2024
Akustika - Slabljenje zvoka pri širjenju na prostem - 2. del: Inženirska metoda za
napovedovanje ravni zvočnega tlaka na prostem (ISO 9613-2:2024)
Acoustics - Attenuation of sound during propagation outdoors - Part 2: Engineering
method for the prediction of sound pressure levels outdoors (ISO 9613-2:2024)
Akustik - Dämpfung des Schalls bei der Ausbreitung - Teil 2: Verfahren der
Genauigkeitsklasse 2 (Ingenieurverfahren) für die Vorhersage der Schalldruckpegel im
Freien (ISO 9613-2:2024)
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 (ISO
9613-2:2024)
Ta slovenski standard je istoveten z: prEN ISO 9613-2
ICS:
17.140.01 Akustična merjenja in Acoustic measurements and
blaženje hrupa na splošno noise abatement in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
International
Standard
ISO 9613-2
Second edition
Acoustics — Attenuation of sound
2024-01
during propagation outdoors —
Part 2:
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
Reference number
ISO 9613-2:2024(en) © ISO 2024
ISO 9613-2:2024(en)
© ISO 2024
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Published in Switzerland
ii
ISO 9613-2:2024(en)
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 Calculation of the attenuation terms . 8
7.1 Geometric divergence, A .8
div
7.2 Atmospheric absorption, A .9
atm
7.3 Ground attenuation, 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 . 20
7.5.2 Single reflection at a flat surface – conditions and calculation . 20
7.5.3 Multi-reflection up to higher orders .21
7.5.4 Reflections at cylindrical surfaces . 22
8 Meteorological correction, C .23
met
9 Accuracy and limitations of the method .25
Annex A (informative) Additional types of attenuation, A .27
misc
Annex B (informative) Directivity correction, D, for chimney stacks .34
c
Annex C (informative) Meteorological correction due to the dependency of C from the angular
wind distribution .38
Annex D (informative) Calculation of sound pressure levels caused by wind turbines .42
Bibliography .45
iii
ISO 9613-2:2024(en)
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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This document was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This second edition cancels and replaces the first edition (ISO 9613-2:1996), which has been technically
revised.
The main changes are as follows:
— subdivision of extended sources improved (more detailed to decrease uncertainty with software
implementations);
— improved classification of the source-directivity;
— improved and more detail specified in the determination of the ground factor G (projection to horizontal
plane);
— integration of a correction for A to account for the decreasing ground effect for small values of distance/
gr
height – harmonizing the General method 7.3.1 and the Simplified method 7.3.2;
— modified definition of the mean height h for the application of the Simplified method 7.3.2;
m
— integration of the strategy to calculate screening as it was developed with ISO/TR 17534-3;
— modified specification of the barrier attenuation D and the correction for meteorological effects K to
z met
eliminate well known shortcomings with low barriers and large source-to-receiver distances;
— inclusion of clear specifications on how to combine vertical and lateral diffraction (from ISO/TR 17534-3);
— improved specification of the minimal extension (width or height) of a reflecting surface;
— multi-reflections up to higher orders (in accordance with ISO/TR 17534-3);
— reflections at vertical cylindrical surfaces;
iv
ISO 9613-2:2024(en)
— additional to the simple method for the attenuation of foliage without any parameter dependencies of the
old version ISO 9613-2:1996, A.2.2, a new and more detailed method including the influence of forestal
parameters (see A.2.3);
— the directivity correction D for chimney stacks (see Annex B);
c
— proposal for a meteorological correction derived from the local wind-climatology (see Annex C);
— calculation of sound pressure levels caused by wind turbines (see Annex D).
A list of all parts in the ISO 9613 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.
v
ISO 9613-2:2024(en)
Introduction
[1][2][3]
The ISO 1996 series of standards specifies methods for the description of noise outdoors in community
environments. Other standards specify methods for determining the sound power levels emitted by
[4]
various noise sources, such as machinery and specified equipment (ISO 3740 series ), or industrial plants
[5]
(ISO 8297 ). This document is intended to bridge the gap between these two types of standards, to enable
noise levels in the community to be predicted from sources of known sound emission. The method described
in this document is general in the sense that it may be applied to a wide variety of noise sources and covers
most of the major mechanisms of attenuation. There are, however, constraints on its use, which arise
principally from the description of environmental noise in the ISO 1996 series.
This version includes the modifications developed for reasons of quality assurance if the method is
[6] [7]
implemented in software as described in ISO 17534-1 and ISO/TR 17534-3 and some improvements to
make the applied strategy fit for broad
...
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