ILNAS-EN 61649:2008. Weibull analysis. Analyse de Weibull. Weibull-Analyse
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1 Weibull analysis Analyse de Weibull Weibull-Analyse 11/2008
2 National Foreword This European Standard EN 61649:2008 was adopted as Luxembourgish Standard in November Every interested party, which is member of an organization based in Luxembourg, can participate for FREE in the development of Luxembourgish (ILNAS), European (CEN, CENELEC) and International (ISO, IEC) standards: - Participate in the design of standards - Foresee future developments - Participate in technical committee meetings index.html THIS PUBLICATION IS COPYRIGHT PROTECTED Nothing from this publication may be reproduced or utilized in any form or by any mean - electronic, mechanical, photocopying or any other data carries without prior permission!
3 EUROPEAN STANDARD EN NORME EUROPÉENNE EUROPÄISCHE NORM November 2008 ICS ; English version Weibull analysis (IEC 61649:2008) Analyse de Weibull (CEI 61649:2008) Weibull-Analyse (IEC 61649:2008) This European Standard was approved by CENELEC on CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard 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 Central Secretariat or to any CENELEC member. This European Standard 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 Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61649:2008 E
4 EN 61649: Foreword The text of document 56/1269/FDIS, future edition 2 of IEC 61649, prepared by IEC TC 56, Dependability, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN on The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) latest date by which the national standards conflicting with the EN have to be withdrawn (dow) Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61649:2008 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC IEC IEC IEC IEC IEC NOTE Harmonized as EN :2003 (not modified). NOTE Harmonized as EN :2004 (not modified). NOTE Harmonized as EN :2004 (not modified). NOTE Harmonized as EN :2005 (not modified). NOTE Harmonized as EN :2008 (not modified). NOTE Harmonized as EN 61703:2002 (not modified).
5 3 EN 61649:2008 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC International Electrotechnical Vocabulary (IEV) - Chapter 191: Dependability and quality of service - - IEC Dependability management - Part 3-5: Application guide - Reliability test conditions and statistical test principles IEC ) Electromechanical elementary relays - Part 2: Reliability ISO Statistical interpretation of data - Techniques of estimation and tests relating to means and variances ISO Statistics - Vocabulary and symbols - Part 1: General statistical terms and terms used in probability - - EN ) ) Undated reference. 2) Valid edition at date of issue.
6 INTERNATIONAL STANDARD NORME INTERNATIONALE Weibull analysis Analyse de Weibull IEC Edition IEC 61649:2008
7 IEC:2008 CONTENTS FOREWORD...5 INTRODUCTION Scope Normative references Terms, definitions, abbreviations and symbols Terms and definitions Abbreviations Symbols Application of the techniques The Weibull distribution The two-parameter Weibull distribution The three-parameter Weibull distribution Data considerations Data types Time to first failure Material characteristics and the Weibull distribution Sample size Censored and suspended data Graphical methods and goodness-of-fit Overview How to make the probability plot Ranking The Weibull probability plot Dealing with suspensions or censored data Probability plotting Checking the fit Hazard plotting Interpreting the Weibull probability plot The bathtub curve General β < 1 Implies early failures β = 1 Implies constant instantaneous failure rate β > 1 Implies wear-out Unknown Weibull modes may be "masked" Small samples Outliers Interpretation of non-linear plots Distributions other than the Weibull Data inconsistencies and multimode failures Computational methods and goodness-of-fit Introduction Assumptions and conditions Limitations and accuracy Input and output data...26
8 61649 IEC: Goodness-of-fit test MLE point estimates of the distribution parameters β and η Point estimate of the mean time to failure Point estimate of the fractile (10 %) of the time to failure Point estimate of the reliability at time t (t T) Software programs Confidence intervals Interval estimation of β Interval estimation of η MRR Beta-binomial bounds Fisher's Matrix bounds Lower confidence limit for B Lower confidence limit for R Comparison of median rank regression (MRR) and maximum likelihood (MLE) estimation methods Graphical display B life estimates sometimes known as B or L percentiles Small samples Shape parameter β Confidence intervals Single failure Mathematical rigor Presentation of results WeiBayes approach Description Method WeiBayes without failures WeiBayes with failures WeiBayes case study Sudden death method Other distributions...37 Annex A (informative) Examples and case studies...38 Annex B (informative) Example of computations...40 Annex C (informative) Median rank tables...42 Annex D (normative) Statistical Tables...47 Annex E (informative) Spreadsheet example...48 Annex F (informative) Example of Weibull probability paper...55 Annex G (informative) Mixtures of several failure modes...56 Annex H (informative) Three-parameter Weibull example...59 Annex I (informative) Constructing Weibull paper...61 Annex J (informative) Technical background and references...64 Bibliography...67 Figure 1 The PDF shapes of the Weibull family for = 1, Figure 2 Total test time (in minutes)...16 Figure 3 Typical bathtub curve for an item...19
9 IEC:2008 Figure 4 Weibull failure modes may be masked...21 Figure 5 Sample size: Figure 6 Sample size: Figure 7 An example showing lack of fit with a two-parameter Weibull distribution...23 Figure 8 The same data plotted with a three-parameter Weibull distribution shows a good fit with 3 months offset (location 2,99 months)...24 Figure 9 Example of estimating t 0 by eye...25 Figure 10 New compressor design WeiBayes versus old design...35 Figure A.1 Main oil pump low times...38 Figure A.2 Augmenter pump bearing failure...39 Figure A.3 Steep β values hide problems...39 Figure B.1 Plot of computations...41 Figure E.1 Weibull plot for graphical analysis...49 Figure E.2 Weibull plot of censored data...51 Figure E.3 Cumulative hazard plot for data of Table E Figure E.4 Cumulative hazard plots for Table E Figure H.1 Steel-fracture toughness Curved data...59 Figure H.2 t 0 improves the fit of Figure H.1 data...60 Table 1 Guidance for using this International Standard...11 Table 2 Ranked flare failure rivet data...15 Table 3 Adjusted ranks for suspended or censored data...16 Table 4 Subgroup size to estimate time to X % failures using the sudden death method...36 Table 5 Chain data: cycles to failure...36 Table B.1 Times to failure...40 Table B.2 Summary of results...41 Table D.1 Values of the gamma function...47 Table D.2 Fractiles of the normal distribution...47 Table E.1 Practical analysis example...48 Table E.2 Spreadsheet set-up for analysis of censored data...50 Table E.3 Example of Weibull analysis for suspended data...50 Table E.4 Example of Spreadsheet application for censored data...51 Table E.5 Example spreadsheet...52 Table E.6 A relay data provided by ISO/TC94 and Hazard analysis for failure mode Table I.1 Construction of ordinate (Y)...62 Table I.2 Construction of abscissa (t)...62 Table I.3 Content of data entered into a spreadsheet...62
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