EN 61400-11:2013/A1:2018

Wind turbines - Part 11: Acoustic noise measurement techniques

The contents of the corrigendum of October 2019 have been included in this copy.

Windenergieanlagen - Teil 11: Schallmessverfahren

Eoliennes - Partie 11: Techniques de mesure du bruit acoustique

Le contenu du corrigendum d'octobre 2019 a été pris en considération dans cet exemplaire.

Sistemi za proizvodnjo energije na veter - 11. del: Tehnike merjenja hrupa - Dopolnilo A1 (IEC 61400-11:2012/A1:2018)

General Information

• Status: Published
• Publication Date: 16-Aug-2018
• Withdrawal Date: 19-Jul-2021
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: CLC/TC 88 - Wind turbines
• Drafting Committee: IEC/TC 88 - IEC_TC_88
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 17-Aug-2018
• Completion Date: 17-Aug-2018
• Ref Project: SIST EN 61400-11:2013/A1:2018 - Wind energy generation systems - Part 11: Acoustic noise measurement techniques (IEC 61400-11:2012/A1:2018)

Relations

• Amends: EN 61400-11:2013 - Wind turbines - Part 11: Acoustic noise measurement techniques
• Effective Date: 20-Dec-2016
• Corrected By: EN 61400-11:2013/A1:2018/AC:2019-11 - Wind turbines - Part 11: Acoustic noise measurement techniques
• Effective Date: 05-Nov-2019

Overview

EN 61400-11:2013/A1:2018 - adopted from IEC 61400-11:2012/A1:2018 - is the CLC European standard that specifies acoustic noise measurement techniques for wind turbines. This amendment (A1, approved 2018) incorporates clarifications and procedural changes including the corrigendum of October 2019. It updates instrumentation requirements, measurement procedures, tonality analysis, data-reduction methods and reporting requirements for wind turbine noise and sound power determination.

Key topics and technical requirements

• Measurement positions and tolerances
  • Measurement distance should be as close as possible to the specified radius R0; allowed tolerances must be justified and reported.
• Instrumentation
  • Requirements for equipment used to determine the equivalent continuous A‑weighted sound pressure level and A‑weighted 1/3‑octave band spectra are specified as “relevant to this document.”
• Combining measurement series
  • New subclause on combining multi‑day or differing‑condition measurement series: data may be pooled or analysed separately and combined. Overlapping results must use weighted means (see normative Annex H) with uncertainty as weight; decisions must be justified and evidence provided.
• Tonality assessment
  • Clarifications and a revised tonality‑analysis procedure (flowchart) define how to identify tones, classify spectral lines, calculate tone levels (including the 1.8 dB correction), determine audibility (ΔL), and report tone frequencies for tones of the same origin.
• Data reduction and uncertainty
  • Updated interpolation and equations for calculating noise levels at bin centres and associated uncertainties. Annex H gives a normative method for weighted averaging of apparent sound power spectra across series and a method for computing combined uncertainties.
• Small wind turbines (Annex F)
  • Guidance for tonal audibility and immission maps: use spherical spreading with a ground reflection correction of 1.5 dB and draw contours in 5 dB steps; immission maps may exclude local tonality penalties unless explicitly included and declared.

Applications and practical use

EN 61400-11:2013/A1:2018 is used for:

• Type testing and certification of wind turbine acoustic performance
• Acoustic site assessments and noise compliance studies
• Preparation of immission maps for small wind turbine installations
• Manufacturer noise declarations and product development (acoustic design)
• Regulatory enforcement and environmental impact assessments

Who should use this standard

• Acoustic consultants and testing laboratories performing wind turbine noise measurements
• Wind turbine manufacturers and R&D teams
• Certification bodies and conformity assessment organizations
• Environmental regulators, planners and project developers

Related standards

• IEC 61400-11 (base international document) - EN 61400-11 is the adopted European version. (Refer to IEC/TC 88 publications for associated wind energy standards.)

Keywords: EN 61400-11:2013/A1:2018, wind turbines, acoustic noise measurement, tonality, sound power, 1/3‑octave spectra, measurement series, data reduction, uncertainty, immission map.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2018
Sistemi za proizvodnjo energije na veter - 11. del: Tehnike merjenja hrupa -
Dopolnilo A1 (IEC 61400-11:2012/A1:2018)
Wind energy generation systems - Part 11: Acoustic noise measurement techniques
(IEC 61400-11:2012/A1:2018)
Ta slovenski standard je istoveten z: EN 61400-11:2013/A1:2018
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
27.180 Vetrne elektrarne Wind turbine energy systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 61400-11:2013/A1

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2018
ICS 27.180
English Version
Wind turbines - Part 11: Acoustic noise measurement techniques
(IEC 61400-11:2012/A1:2018)
Eoliennes - Partie 11: Techniques de mesure du bruit Windenergieanlagen - Teil 11: Schallmessverfahren
acoustique (IEC 61400-11:2012/A1:2018)
(IEC 61400-11:2012/A1:2018)
This amendment A1 modifies the European Standard EN 61400-11:2013; it was approved by CENELEC on 2018-07-20. CENELEC
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this amendment the
status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as
the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61400-11:2013/A1:2018 E

European foreword
The text of document 88/615/CDV, future edition 1 of IEC 61400-11:2012/A1, prepared by IEC/TC 88
"Wind energy generation systems" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 61400-11:2013/A1:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-04-20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-07-20
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61400-11:2012/A1:2018 was approved by CENELEC as a
European Standard without any modification.
IEC 61400-11 ®
Edition 3.0 2018-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
A MENDMENT 1
AM ENDEMENT 1
Wind turbines –
Part 11: Acoustic noise measurement techniques

Éoliennes –
Partie 11: Techniques de mesure du bruit acoustique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-5760-9

– 2 – IEC 61400-11:2012/AMD1:2018
© IEC 2018
FOREWORD
This amendment has been prepared IEC technical committee 88: Wind energy generation
systems.
The text of this amendment is based on the following documents:
CDV Report on voting
88/615/CDV 88/644A/RVC
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC website under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
INTRODUCTION to the Amendment
This amendment to IEC 61400-11:2012 addresses the situation where a measurement
consists of measurements series on different days or with substantially different conditions.
Furthermore, clarifications have been introduced on tonality analysis and reporting. Editorial
changes have been made.
6 Instrumentation
6.1.2 Equipment for the determination of the equivalent continuous A-weighted
sound pressure level
Add "relevant to this document" after "requirements".
6.1.3 Equipment for the determination of A-weighted 1/3-octave band spectra
Add, in the second sentence, "relevant to this document" after "requirements".

IEC 61400-11:2012/AMD1:2018 – 3 –
© IEC 2018
7 Acoustic measurements and measurement procedures
7.1 Acoustic measurement positions
Add, at the end of the second paragraph after 2 %, the following new text:
The measurement distance shall be as close as possible to R . The allowed tolerance should
only be used where it is essential to obtain valid data and, where this is done, clear evidence
shall be reported to justify the decision made.
7.2.2 Acoustic measurement requirements
Add "(see 7.2.8)" at the end of 6th bullet of the first paragraph.
Add the following new subclause after 7.2.7:
7.2.8 Combining measurement
...