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ISO/FDIS 26101-2

(Main)

Acoustics — Test methods for the qualification of the acoustic environment — Part 2: Determination of the environmental correction

Acoustics — Test methods for the qualification of the acoustic environment — Part 2: Determination of the environmental correction

This document specifies methods for qualifying an environment that approximates to an acoustic free field near one or more reflecting planes. The goal of the qualification is to determine the environmental correction K2, which is used to correct for reflected sound when determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in such an environment. In addition, the environmental correction K2 is used as an input parameter for the determination of the local environmental correction K3 which is used to determine the emission sound pressure level in an environment that approximates to an acoustic free field near one or more reflecting planes. In practice, the K2 value determined will be a function of both the reflected sound from the test environment and the shape and size of the measurement surface used for the K2 determination. For the purposes of this standard and the standards that refer to it, the differences between K2 values determined with different measurement surfaces are assumed to be included in the stated measurement uncertainty for the test method.

Acoustique — Méthodes d’essai pour la qualification de l'environnement acoustique — Partie 2: Détermination de la correction d’environnement

General Information

Status
Not Published
ICS
17.140.01 - Acoustic measurements and noise abatement in general
Technical Committee
ISO/TC 43/SC 1 - Noise
Drafting Committee
ISO/TC 43/SC 1 - Noise
Current Stage
5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
Start Date
06-Mar-2024
Completion Date
06-Mar-2024
Ref Project

Relations

Consolidates
ISO 16129:2018 - Surface chemical analysis — X-ray photoelectron spectroscopy — Procedures for assessing the day-to-day performance of an X-ray photoelectron spectrometer
Effective Date
06-Jun-2022

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ISO/FDIS 26101-2 - Acoustics — Test methods for the qualification of the acoustic environment — Part 2: Determination of the environmental correction Released:21. 02. 2024ISO/FDIS 26101-2 - Acoustics — Test methods for the qualification of the acoustic environment — Part 2: Determination of the environmental correction Released:21. 02. 2024
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REDLINE ISO/FDIS 26101-2 - Acoustics — Test methods for the qualification of the acoustic environment — Part 2: Determination of the environmental correction Released:21. 02. 2024REDLINE ISO/FDIS 26101-2 - Acoustics — Test methods for the qualification of the acoustic environment — Part 2: Determination of the environmental correction Released:21. 02. 2024
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Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/FDIS 26101-2
ISO/TC 43/SC 1
Acoustics — Test methods for
Secretariat: DIN
the qualification of the acoustic
Voting begins on:
environment —
2024-03-06
Part 2:
Voting terminates on:
2024-05-01
Determination of the environmental
correction
Acoustique — Méthodes d’essai pour la qualification de
l'environnement acoustique —
Partie 2: Détermination de la correction d’environnement
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.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING 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.
Reference number
ISO/FDIS 26101-2:2024(en) © ISO 2024

---------------------- Page: 1 ----------------------
FINAL DRAFT
ISO/FDIS 26101-2:2024(en)
International
Standard
ISO/FDIS 26101-2
ISO/TC 43/SC 1
Acoustics — Test methods for
Secretariat: DIN
the qualification of the acoustic
Voting begins on:
environment —
Part 2:
Voting terminates on:
Determination of the environmental
correction
Acoustique — Méthodes d’essai pour la qualification de
l'environnement acoustique —
Partie 2: Détermination de la correction d’environnement
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
COPYRIGHT PROTECTED DOCUMENT
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 26101-2:2024(en) © ISO 2024

© ISO 2024 – All rights reserved
ii

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ISO/FDIS 26101-2:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Qualification procedures for the acoustic environment . 3
4.1 General .3
4.2 Absolute comparison test .3
4.3 Methods based on room absorption . .3
4.4 Inverse-square-law qualification of parallelepiped and cylindrical measurement
surfaces .
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ISO/TC 43/SC 1
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Secretariat: DIN
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Acoustics – — Test methods for the qualification of the acoustic
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environment – —
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Part 2:
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Determination of the environmental correction
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Partie 2: Détermination de la correction d’environnement
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ISO/FDIS 26101-2:2024(en)
Formatted: Font: Bold
Formatted: HeaderCentered, Left
Formatted: Left: 1.5 cm, Right: 1.5 cm, Header
© ISO 2024
distance from edge: 1.27 cm, Footer distance from
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
Commented [eXtyles1]: The reference "ISO 2024" is to a
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
withdrawn standard
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Formatted: Default Paragraph Font
at the address below or ISO’s member body in the country of the requester.
Formatted: Default Paragraph Font
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Formatted: French (France)
Formatted: French (France)
Fax: +41 22 749 09 47
EmailE-mail: copyright@iso.org
Formatted: French (France)
Website: www.iso.orgwww.iso.org
Formatted: zzCopyright address, Adjust space between
Latin and Asian text, Adjust space between Asian text
Published in Switzerland
and numbers
Formatted: FooterPageRomanNumber, Left
© ISO 2024 – All rights reserved

ii

---------------------- Page: 2 ----------------------
ISO/FDIS 26101-2:2024(en)
Formatted: Font: 11 pt, Bold
Formatted: Font: Bold
Formatted: HeaderCentered, Left
Contents
Foreword . vi
Introduction . viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Qualification procedures for the acoustic environment . 3
4.1 General . 3
4.2 Absolute comparison test . 3
4.3 Methods based on room absorption . 3
4.4 Inverse-square-law qualification of parallelepiped and cylindrical measurement surfaces . 3
4.5 Approximate method based on an estimation of the equivalent absorption area. 4
5 Absolute comparison test .
...

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