ISO INTERNATIONAL STANDARD 10816-21 Firstedition 2015-05-01 Mechanical vibration Evaluation of machine vibration by measurements on non-rotating parts Part 21: Horizontal axis wind turbines with gearbox Vibrationsmecaniques-Evaluationdes vibrationsdes machines par mesuragessurles parties nontournantes Partie21:Turbineséoliennes aaxehorizontalavecmultiplicateur Reference number IS010816-21:2015(E) LSO Intermational Organization for Standardization @IS02015 IS010816-21:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8. CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intematinaibr PrganizationfoStandardization networking permited without license from IHS NotforResale, 2015/7/2402:55:03 IS010816-21:2015(E) Contents Page Foreword ..iv Introduction.. .. 1 Scope. 2 Normativereferences 3 Terms and definitions ..2 4 Basic principles. .2 4.1 Measurement and characteristic quantities .2 4.2 Averagingmethods and evaluation quantitiesforwind turbinevibration .3 4.3 Evaluation period. .3 5 Instructions on measurement and interpretation .4 5.1 General .4 5.2 Nacelle and tower 4 5.3 Rotor bearing .5 5.4 Gearbox. .5 5.5 Generator .6 5.6 Requirements for themeasurement equipment .6 5.7 Mountingand connectionofthevibrationtransducers .7 5.8 Operating conditions during measurements 7 6 Evaluation criteria .8 6.1 General .8 6.2 Evaluation zones .8 6.3 Change in vibration magnitude .9 7 Evaluation zone boundaries .9 8 Setting of operational limits .9 8.1 General .9 8.2 ALERT limits. .10 8.3 ALARMlimits .10 8.4 TRIPlimits ..10 9 Information on vibration monitoring .10 9.1 Monitoring broad-band vibration .10 9.2 Condition monitoring. ..10 AnnexA(informative)Evaluationzoneboundaries .12 Annex B (informative) Schematic diagrams of two typical wind turbine designs with gearbox. ...13. Bibliography .15 iii ithout license from IHS