IEC_61400-11-2018.pdf

IEC 61400-11 Edition 3.1 2018-06 CONSOLIDATED VERSION Wind turbines Part 11:Acoustic noise measurement techniques IEC 61400-11:2012-11+AMD1:2018-06 CSV(en)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2018 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb infoiec.ch CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards,Technical Specifications,Technical Reports and other documents.Available for PC,Mac OS,Android Tablets and iPad.IEC publications search-webstore.iec.ch/advsearchform The advanced search enables to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available online and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing 21 000 terms and definitions in English and French,with equivalent terms in 16 additional languages.Also known as the International Electrotechnical Vocabulary(IEV)online.IEC Glossary-std.iec.ch/glossary 67 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002.Some entries have been collected from earlier publications of IEC TC 37,77,86 and CISPR.IEC Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Customer Service Centre:salesiec.ch.IEC 61400-11 Edition 3.1 2018-06 CONSOLIDATED VERSION Wind turbines Part 11:Acoustic noise measurement techniques INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 27.180 ISBN 978-2-8322-5826-2 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinside IEC 61400-11 Edition 3.1 2018-06 REDLINE VERSION Wind turbines Part 11:Acoustic noise measurement techniques IEC 61400-11:2012-11+AMD1:2018-06 CSV(en)colourinside 2 IEC 61400-11:2012+AMD1:2018 CSV IEC 2018 CONTENTS FOREWORD.5 INTRODUCTION.7 INTRODUCTION to the Amendment.7 1 Scope.8 2 Normative references.8 3 Terms and definitions.9 4 Symbols and units.12 5 Outline of method.13 6 Instrumentation.14 6.1 Acoustic instruments.14 6.1.1 General.14 6.1.2 Equipment for the determination of the equivalent continuous A-weighted sound pressure level.14 6.1.3 Equipment for the determination of A-weighted 1/3-octave band spectra.14 6.1.4 Equipment for the determination of narrow band spectra.14 6.1.5 Microphone with measurement board and windscreen.14 6.1.6 Acoustical calibrator.16 6.1.7 Data recording/playback systems.16 6.2 Non-acoustic Instruments.16 6.2.1 General.16 6.2.2 Anemometers.16 6.2.3 Electric power transducer.17 6.2.4 Other instrumentation.17 6.3 Traceable calibration.17 7 Acoustic measurements and measurement procedures.17 7.1 Acoustic measurement positions.17 7.2 Acoustic measurements.20 7.2.1 General.20 7.2.2 Acoustic measurement requirements.20 7.2.3 A-weighted sound pressure level.21 7.2.4 A-weighted 1/3-octave band measurements.21 7.2.5 A-weighted narrow band measurements.21 7.2.6 Optional acoustic measurements at positions 2,3 and 4.21 7.2.7 Other optional measurements.22 7.2.8 Combining measurement series.22 8 Non-acoustic measurements.22 8.1 General.22 8.2 Wind speed measurements.22 8.2.1 Determination of the wind speed during wind turbine operation.23 8.2.2 Wind speed measurements during background noise measurements.24 8.3 Downwind direction.24 8.4 Other atmospheric conditions.25 8.5 Rotor speed and pitch angle measurement.25 9 Data reduction procedures.25 IEC 61400-11:2012+AMD1:2018 CSV 3 IEC 2018 9.1 General methodology for sound power level