IEC 61123-ed.2.0

Podrobné informace

Označení: IEC 61123-ed.2.0

Datum vydání: 22.11.2019

Stran: 98

Země: Mezinárodní technická norma

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Anotace

IEC 61123:2019 is intended to define a procedure to verify if a reliability of an item/system complies with the stated requirements. The requirement is assumed to be specified as the percentage of success (success ratio) or the percentage of failures (failure ratio). This document can be used where a number of items are tested (number of trials performed) and classified as passed or failed. It can also be used where one or a number of items are tested repeatedly. The procedures are based on the assumption that the probability of success or failure is the same from trial to trial (statistically independent events). Plans for fixed trial/failure terminated tests as well as truncated sequential probability ratio tests (SPRTs) are included. This document contains extensive tables with ready-to-use SPRT plans and their characteristics for equal and non-equal risks for supplier and customer. In the case of the reliability compliance tests for constant failure rate/intensity, IEC 61124 applies. This second edition cancels and replaces the first edition published in 1991. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: The sequential probability ratio test (SPRT) [1, 2][1] has been significantly developed in recent years [3, 4, 5]. This edition contains shorter and accurate tests, a wide range of test plans, and significant additional characteristic data, as follows: the tests are significantly truncated (the maximum trial numbers are low) without substantially increasing the expected number of trials to decision (ENT); the true producer’s and consumer’s risks (?, ß) are given and very close to the nominal (?, ß); the range of the test parameters is wide (failure ratio, risks and discrimination ratio); the test plans include various risk ratios (not restricted to equal risks only); the values of ENT are accurate and given in the relevant region (for practical use); guidelines for extension of the test sets (interpolation and extrapolation) are included. In Annex C, the use of the cumulative binomial distribution function of Excel that simplifies the procedure of designing has been added (Clause C.3). Keywords: verify if a reliability of an item/system complies with the stated requirements IEC 61123:2019 vise a definir une procedure pour verifier si la fiabilite dune entite/dun systeme satisfait aux exigences specifiees. Lexigence est admise comme etant specifiee sous forme de pourcentage de succes (proportion de succes) ou de pourcentage de defaillances (proportion de defaillances). Le present document peut etre utilise lorsquun certain nombre dentites sont soumises a lessai (nombre depreuves realisees) et classees comme ayant satisfait ou echoue a lessai. Il peut egalement etre utilise lorsquune ou plusieurs entites sont soumises a lessai de facon repetee. Les procedures sont fondees sur lhypothese que la probabilite de succes ou de defaillance est identique dune epreuve a lautre (evenements statistiquement independants). Le present document inclut des plans dessais a nombre fixe depreuves et de defaillances, ainsi que des essais de rapport de probabilite progressifs (SPRT). Il contient des tableaux complets decrivant des plans de SPRT prets a lemploi et leurs caracteristiques associees, les risques pour le fournisseur et le client etant egaux ou non. Dans le cas dessais de conformite de fiabilite relatifs a un taux/une intensite constant(e) de defaillance, lIEC 61124 sapplique. Cette deuxieme edition annule et remplace la premiere edition parue en 1991. Cette edition constitue une revision technique. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: les essais sont considerablement tronques (le nombre maximal depreuves est faible) sans pour autant augmenter substantiellement le nombre prevu depreuves pour decision (ENT – expected number of trials); les risques vrais du fournisseur et du client (?, ß) sont connus et tres proches des valeurs nominales (?, ß); la plage des parametres dessai est etendue (proportion de defaillance, risques et rapport de discrimination); les plans dessai integrent differents rapports de risque (qui ne se limitent pas uniquement a des risques egaux); les valeurs de lENT sont precises et donnees dans la region pertinente (a des fins dutilisation pratique); des lignes directrices sont fournies en vue detendre les series dessais (interpolation et extrapolation); en Annexe C, lutilisation de la fonction de distribution binomiale cumulative dExcel pour simplifier la procedure de calcul a ete ajoutee (Article C.3). Mots cles: verifier si la fiabilite dune entite/dun systeme satisfait aux exigences specifiees