ISO INTERNATIONAL STANDARD 19973-1 Second edition 2015-08-01 Pneumatic fluid power Assessment of component reliability by testing Part 1: General procedures Transmissions pneumatiques - Evaluation par essais de la fiabilite des composants - Partie 1: Procedures genérales Reference number ISO 19973-1:2015(E) SO International Organization for Standardization @ IS0 2015 nstitute of S vided by IHS under I ted without license from IHS IS0 19973-1:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,PublishedinSwitzerland 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. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax+412274909 47 [email protected] www.iso.org Intenationai br PrganizationforStandardization I by IHS unde etworking permitted without license from IHS IS0 19973-1:2015(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions. ..1 4 Symbols and units of measurement ..3 5 Concept of reliability ..3 6 Strategies for conducting testing. ..4 6.1 Assumptions ..4 6.2 Test stand and measurement of parameters .4 6.3 Test planning ..4 7 Statistical analysis .4 8 Test conditions ..4 9 Sample size and selection criteria. .5 10 End oftest .6 10.1 Minimum number of failures required ..6 10.2 Termination time of a test unit. ..6 10.3 Termination life . 6 10.4 Suspended test unit .6 10.5 Censoredtest ..6 11 Evaluation of reliability characteristics from the test data .6 12 Test report ..8 13 Identification statement (reference to thispart ofIs0 19973) ..9 Annex A (normative) Determination of the termination life ..10 Annex B (informative) Determination of threshold values for leakage rates. ..14 Annex C (informative) Calculation procedures for censored data without suspensions. ..21 Annex D (informative) Calculation procedures for censored data with suspensions ..24 Annex E (informative) Verification of minimum life at a specified reliability and one-sided confidence level .28 Annex F (informative) Dealing with outliers in test data ..33 Annex G (informative) Examples of test results .39 Bibliography .44 iii dardization 5956617 thout license from IHS