1、BRITISH STANDARD BS5760-10.3: 1993 IEC1070:1991 Reliability of systems, equipment and components Part 10: Guide to reliability testing Section10.3 Compliance test procedures for steady-state availabilityBS5760-10.3:1993 This British Standard, having been prepared under the directionof the Quality, M
2、anagement and Statistics Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15April1993 BSI03-1999 The following BSI references relate to the work on this standard: Committee reference QMS/23 Draft for comment 90/97782 DC ISBN 0 580 21713 2 Com
3、mittees responsible for this British Standard The preparation of this British Standard was entrusted by the Quality, Management and Statistics Standards Policy Committee (QMS/-) to Technical Committee QMS/23, upon which the following bodies were represented: AEA Technology Association of Consulting
4、Engineers Association of Project Managers British Gas plc British Railways Board City University Civil Aviation Authority Consumers Association Cranfield Information Technology Institute Cranfield Institute of Technology Design Council EEA (the Association of Electronics, Telecommunications and Busi
5、ness Equipment Industries) Electricity Association Electronic Components Industry Federation Engineering Equipment and Materials Users Association GAMBICA (BEAMA Ltd.) Institute of Petroleum Institute of Quality Assurance Institution of Electrical Engineers Institution of Plant Engineers Mercury Com
6、munications Limited Ministry of Defence National Computing Centre Ltd. Railway Industry Association of Great Britain Royal Institution of Chartered Surveyors Safety and Reliability Society Society of British Aerospace Companies Limited Society of Environmental Engineers Society of Motor Manufacturer
7、s and Traders Limited University of Technology, Loughborough Amendments issued since publication Amd. No. Date CommentsBS5760-10.3:1993 BSI 03-1999 i Contents Page Committees responsible Inside front cover National foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Definitions 2 4 Symbo
8、ls 2 5 Conditions for availability performance testing 3 6 Data collection 5 7 Time distributions 6 8 Compliance testing planning 7 9 Compliance test plans 8 10 Test report 10 Annex A (normative) Table A.1 to Table A.4 13 Annex B (informative) Numerical examples 19 Annex C (informative) Bibliography
9、 20 Figure 1 A typical realization of the test process 6 Figure 2 Example of a sequential test plan (p = 1, D = 5, ! = “ = 0,1) 9 Table A.1 F distribution 13 Table A.2 Standardized normal distribution 14 Table A.3 Discrimination ratio (D) and rejection limit(U lim ) for test plan 3 14 Table A.4 Acce
10、ptance (Ac) and rejection (Re) limits for test plan 4 16 List of references Inside back coverBS5760-10.3:1993 ii BSI 03-1999 National foreword This Part of BS5760 has been prepared under the direction of the Quality, Management and Statistics Standards Policy Committee. It is identical with IEC1070:
11、1991 Compliance test procedures for steady-state availability published by the International Electrotechnical Commission (IEC). Ten Parts of this standard have been published and these may be summarized as follows: Part 0: Introductory guide to reliability. This Part provides guidance to directors o
12、f companies who need to know why reliability is important to them, to engineers not trained in quality and reliability to show how reliability should influence their technical decision making, and to middle management not specialized in engineering, to explain how measures to achieve reliability sho
13、uld be integrated with other aspects of project management to give optimum results. Part 1: Guide to reliability and maintainability programme management. ThisPart discusses the essential features of a comprehensive reliability and maintainability programme for the planning, organization, direction
14、and control of resources to produce systems, equipment and components that will be reliable and maintainable. It includes consideration of the specification and assessment of reliability and maintainability and of arrangements for the collection of reliability data. Part 2: Guide to the assessment o
15、f reliability. This Part recommends general procedures for the assessment of reliability of hardware systems and contains guidance for the reliability practitioner on the quantitative and statistical aspects of reliability, such as reliability modelling, the provision of data, and the concepts of re
16、dundancy and simulation. Part 3: Guide to reliability practices: examples. This Part contains authentic practical examples illustrating the principles established in Parts1 and2 of BS5760. Part 4: Guide to specification clauses relating to the achievement and development of reliability in new and ex
17、isting items. This Part provides more detailed guidance on the specification of reliability. Part 5: Guide to failure modes, effects and criticality analysis (FMEA) and (FMECA). This Part describes failure modes and effects analysis (FMEA) and failure modes, effects and criticality analysis (FMECA),
18、 and gives guidance on the application of these techniques. Part 6: Guide to programmes for reliability growth. This Part describes procedures to expose and remove weaknesses in hardware and software items in order to achieve acceptable reliability in a product. It explains basic concepts, managemen
19、t and test procedures and describes techniques for analysis and correction of failures. Part 7: Guide to fault tree analysis. This Part describes fault tree analysis and gives guidance on the application of this technique which may be used to identify factors affecting the reliability, performance a
20、nd safety characteristics of a system. Part 9: Guide to the block diagram technique. This Part describes the use of the block diagram technique for modelling and evaluating the reliability of both elementary and more complex systems. The extension of the method to calculate availability is also outl
21、ined. Part 10: Guide to reliability testing: Section 10.1 General requirements. This Section provides guidance on general principles, procedures and considerations for reliability testing in the laboratory and in the field.BS5760-10.3:1993 BSI 03-1999 iii Section 10.3 Compliance test procedures for
22、steady-state availability. This Section provides guidance on techniques for availability performance testing, under defined conditions, of frequently maintained items. NOTEFurther Sections of Part10 are planned based on other Parts of IEC605 and related IEC standards. Further Parts of BS5760 are env
23、isaged in order to provide guidance on other techniques of reliability management. At present two further Parts are in the process of being drafted, and these are as follows: Part 8: Guide to the assessment of reliability of systems containing software. This Part will provide guidance on the assessm
24、ent of reliability of systems containing software. (This is currently published as DD198:1991). Part 11: Guide to the collection of reliability, maintainability, availability and maintenance support data from the field. Guidance on specific aspects of maintainability is provided in the various Parts
25、 of BS6548 Maintainability of equipment. The Technical Committee has reviewed the provisions of ISO362, IEC605-2, IEC605-3 and IEC605-6, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. Cross-references Internationa
26、l standard Corresponding British Standard IEC50(191):1990 BS4778 Quality vocabulary Part 3 Availability, reliability and maintainability terms Section 3.2:1991 Glossary of international terms (Identical) IEC68-2 BS2011 Environmental testing Part 2.1 Tests Part 2.2 Guidance BS5760 Reliability of syst
27、ems, equipment and components IEC300:1984 Part 1:1985 Guide to reliability and maintainability programme management (Technically equivalent) IEC 605-1:1978 Part 10 Reliability testing Section10.1:1993 General requirements (Identical) BS6548 Maintainability of equipment IEC706-1:1982 Part 1:1984 Guid
28、e to specifying and contracting for maintainability (Identical) IEC706-3:1987 Part 3:1992 Guide to maintainability verification and to the collection, analysis and presentation of maintainability data (Identical) IEC721-1:1990 BS7527 Classification of environmental conditions Part 1:1991 Environment
29、al parameters and their severities (Identical)BS5760-10.3:1993 iv BSI 03-1999 It is envisaged that the revised version of IEC362 will be published as BS5760-11. IEC605-2, IEC605-3 and IEC605-6 are under consideration for publication as further sections of BS5760-10. This standard is a guide and the
30、use of the verbal form “shall” in the text does not indicate mandatory requirements. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of its
31、elf confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi toiv, pages1to20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indica
32、ted in the amendment table on the inside front cover.BS5760-10.3:1993 BSI 03-1999 1 Introduction Requirements on dependability may be expressed either in terms of measures of the individual characteristics reliability performance, maintainability performance and maintenance support performance, or b
33、y measures of availability performance. Availability performance measures include, but are not limited to, instantaneous, mean, asymptotic, asymptotic mean and steady-state versions of availability, and mean accumulated down time, as defined in IEC50(191). The preference for and application of these
34、 measures vary from one industry sector to another and from one product to another, inter alia depending on product application and end user needs. A requirement expressed by one kind of measure may often be possible to convert to another. Forexamplearequirement for mean accumulated down time under
35、steady-state, conditions may be translated into a requirement for steady-state availability. Validation of a specified requirement is often done by means of compliance testing under simulated or actual field conditions. 1 Scope This International Standard specifies techniques for availability perfor
36、mance testing of frequently maintained items when the availability performance measure used is either steady-state availability or steady-state unavailability. It is applicable to compliance testing of the steady-state availability of items attaining only two states, up-state and down-state, under t
37、he following conditions: 1) One single repaired item. 2) All up times have the same exponential distribution. NOTEThis usually implies the need for operation to reach the constant failure intensity period before the compliance test is begun. 3) Preventive maintenance time is not included in down tim
38、e although it is recognized as having possible impact on availability performance. 4) All contributors to down time need to be explicitly stated in the requirement or test specification. 5) Very reliable items may require an extremely long test time to determine compliance. NOTEWith a highly reliabl
39、e item, few or even zero failures may occur within a designated period of time. In such a case, there will be little or (possibly) zero quantitative information on the availability performance since there may be no repair actions. Parties (supplier and customer) applying this standard should agree o
40、n the decision to be made in such an eventuality. In general it is recommended that before the parties invoke this standard in a contract they calculate, or simulate, the results to be obtained from the compliance test. In this way both parties will be knowledgeable regarding the risks they are faci
41、ng. 6) The compliance test procedures use the complementary measure steady-state unavailability. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the ed
42、itions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents Indicated below. Members of IEC and ISO maintain
43、registers of currently valid International Standards. IEC50(191):1990, International Electrotechnical Vocabulary (IEV), chapter191: Dependability and quality of service. IEC68-2, Environmental testingPart2: Tests. IEC300:1984, Reliability and maintainability management. IEC362:1971, Guide for the co
44、llection of reliability, availability, and maintainability data from field performance of electronic items. IEC605-1:1978, Equipment reliability testingPart1: General requirements. IEC605-2, Equipment reliability testingPart2: Guidance for the design of test cycles. (In preparation.). IEC605-3, Equi
45、pment reliability testingPart3: Preferred test conditions. IEC605-6:1986, Equipment reliability testingPart6: Tests for the validity of a constant failure rate assumption. BS5760-10.3:1993 2 BSI 03-1999 IEC706-1:1982, Guide on maintainability of equipmentPart1: Sections 1, 2 and 3. Introduction, req
46、uirements and maintainability programme. IEC706-3:1987, Guide on maintainability of equipmentPart3: Sections 6 and 7: Verification and collection, analysis and presentation of data. IEC721-1:1991, Classification of environmental conditionsPart1: Environmental parameters and their severities. 3 Defin
47、itions For the purposes of this International Standard the terms and definitions of IEC50(191) apply. 4 Symbols The following symbols are used in this International Standard. NOTESymbols that are used only locally are explained as they appear and are not included in this symbol list. ! the nominal p
48、roducers risk (type I risk) “ the nominal consumers risk (type II risk) Ac(r) the acceptance limit in a sequential test Re(r) the rejection limit in a sequential test D the discrimination ratio, D = U 1 /U o U o the specified acceptable value of steady-state unavailability, U o =1A o U 1 the unaccep
49、table value of steady-state unavailability, U 1 =1A 1 U lim the rejection limit in a compliance test u 1! the1! fractile of the standardized normal distribution A o the specified acceptable value of steady-state availability A 1 the unacceptable value of steady-state availability F 1 ! (5 1 , 5 2 ) the 1! fractile of the F-distribution with degrees of freedom 5 1and 5 2 . Table A.1 of Annex A contains fractiles of the F-distribution m d the mean down time m u the mean up time n the sample size, i.e. the number of failures, for a fixed time test r
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