ISO INTERNATIONAL STANDARD 21940-14 First edition 2012-07-01 Mechanical vibration --- Rotor balancing Part 14: Procedures for assessing balance errors Vibrations mecaniques -- Equilibrage des rotors -- Partie 14: Modes operatoires d'evaluation des erreurs d'equilibrage Reference number ISO21940-14:2012(E) @ ISO 2012 Copyrighit In ISO21940-14:2012(E) COPYRIGHT PROTECTEDDOCUMENT ISO 2012 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 microflm, without permission in writing from either IsO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ational Organizafion for Standardizafion @iso 2012-All rights reserved Cy IHS und without licerse from IHS Not for Resale ISO 21940-14:2012(E) Contents Page Foreword .iv Introduction vi 1 Scope. 2 Normative references. 3 Terms and definitions. 4 Balance error sources. 4.1 General. 4.2 Systematic errors. 2 4.3 Randomly variable errors 2 4.4 Scalar errors. 3 5 Errorassessment 3 5.1 General. 3 5.2 Errors caused by balancing equipment and instrumentation 3 5.3 Balance errors caused by component radial and axial runout. 3 5.4 Assessment of balancing operation errors.. 4 5.5 Experimentalassessmentofrandomlyvariableerrors 5 5.6 Experimental assessment of systematic errors 6 6 Combined errorevaluation 6 7 Acceptance criteria. Annex A (informative) Error examples, their identification and evaluation 8 imi Copyrighit Inter omIHS