1、BRITISH STANDARD BS5760-12: 1993 IEC863:1986 Reliability of systems, equipment and components Part 12: Guide to the presentation of reliability, maintainability and availability predictionsBS5760-12:1993 This British Standard, having been prepared under the directionof the Quality, Management and St
2、atistics Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15November1993 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference QMS/23 Special announcement in BSINews, December 1992 ISBN 0 580 22336
3、1 Committees 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 Consul
4、ting Engineers Association of Project Managers British Gas plc British Railways Board British Telecommunications plc City University Civil Aviation Authority Consumers Association Cranfield Institute of Technology Department of Trade and Industry (Standards Policy Unit) Design Council EEA (the Assoc
5、iation of Electronics, Telecommunications and Business Equipment Industries) Electricity Association Electronic Components Industry Federation Federation of Small Businesses GAMBICA (BEAMA Ltd.) Institute of Quality Assurance Institute of Risk Management Institution of Electrical Engineers Instituti
6、on of Mechanical Engineers Institution of Plant Engineers Mercury Communications 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 Lim
7、ited Society of Environmental Engineers Society of Motor Manufacturers and Traders Limited University of Technology, Loughborough Amendments issued since publication Amd. No. Date CommentsBS5760-12:1993 BSI 02-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scop
8、e 1 2 Object 1 3 Definition of terms 1 4 Contents of the presentation 1 5 Detail requirements of the presentation 1 Appendix A Prediction tasks 7 Figure 1 Procedural flow 6 Table I Required information 2 List of references Inside back coverBS5760-12:1993 ii BSI 02-1999 National foreword This Part of
9、 BS5760 has been prepared under the direction of the Quality, Management and Statistics Standards Policy Committee. It is identical with IEC863:1986 Presentation of reliability, maintainability and availability predictions published by the International Electrotechnical Commission (IEC). BS5760 prov
10、ides comprehensive guidance on many aspects of reliability management. Twelve 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 senior management and non-specialists on the importance of reliab
11、ility and explains how measures to achieve reliability should be integrated with other aspects of project management. Part 1: Guide to reliability and maintainability programme management. This Part discusses the essential features of a comprehensive reliability and maintainability programme to prod
12、uce reliable and maintainable products. Part 2: Guide to the assessment of reliability. This Part contains guidance on quantitative and statistical aspects of reliability, including reliability modelling, the provision of data, and the concepts of redundancy and simulation. Part 3: Guide to reliabil
13、ity 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 existing items. This Part provides detailed guidance
14、 on the specification of reliability. Part 5: Guide to failure modes, effects and criticality analysis (FMEA and FMECA). This Part 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
15、 in hardware and software items in order to achieve acceptable reliability in a product. It explains basic concepts, management and test procedures and describes techniques for analysis and correction of failures. Part 7: Guide to fault tree analysis. This Part gives guidance on the application of f
16、ault tree analysis which may be used to identify factors affecting the reliability, performance and 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 elemen
17、tary and more complex systems. The extension of the method to calculate availability is also outlined. 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 laborato
18、ry and in the field. Section 10.3: Compliance test procedures for steady-state availability. This Section provides guidance on techniques for availability performance testing, under defined conditions, of frequently maintained items. NOTEFurther Sections of Part10 based on other Parts of IEC605 and
19、related IEC standards are also planned. Part 12: Guide to the presentation of reliability, maintainability and availability predictions. This part gives guidance on the presentation of quantitative predictions of reliability, maintainability and availability. The items to be included when presenting
20、 prediction information are listed and explained with the object of facilitating comparisons between projects and reports.BS5760-12:1993 BSI 02-1999 iii Part 14: Guide to formal design review. This Part provides guidelines for planning and conducting design reviews. It includes details of the specif
21、ic contributions to be made by various specialists but much of the guidance given is widely applicable and is relevant to the general conduct of design reviews. Further Parts of BS5760 are envisaged in order to provide guidance on other techniques of reliability management. At present three further
22、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 1) . This Part will provide guidance on the assessment of reliability of systems containing software. Part 11: Guide to the collection of reliability, ma
23、intainability, availability and maintenance support data from the field. Part 13: Guide to preferred test conditions for equipment reliability testing. Guidance on specific aspects of maintainability is provided in the various Parts of BS6548 Maintainability of equipment. Additonal information. The
24、guidance provided in this Part of BS5760 is not limited to any specific parts failure model that may be used for prediction but is generally applicable. This standard is a guide and the use of the verbal form “shall” in the text does not indicate mandatory requirements. A British Standard does not p
25、urport 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 itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside fron
26、t cover, pages i to iv, pages1to 8, 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 indicated in the amendment table on theinside front cover. 1) Currently published as a Draft for Development, DD198:19
27、91. Cross-references International standard Corresponding British Standard IEC271 BS4778 Quality vocabulary Part 3 Availability, reliability and maintainability terms Section 3.2:1991 Glossary of international terms (Technically equivalent) IEC68 BS2011 Environmental testing (Most Parts are identica
28、l) NOTEIEC271 is superseded by IEC50(191):1990 with which BS4778-3.2 is identical.iv blankBS5760-12:1993 BSI 02-1999 1 1 Scope This standard defines the items that should be considered for the presentation of information regarding predictions of quantitative characteristics of reliability, maintaina
29、bility and availability of systems and equipment, including hardware, software and human elements. 2 Object The object of this standard is to provide the writer of a prediction report with a complete listing of all items to be considered in making a proper and full presentation of prediction informa
30、tion. This recommended way of presentation is intended to facilitate comparisons between projects or reports. The purpose of a presentation of information on a prediction is to provide the reader of the report with sufficient information for the evaluation of the prediction results and on the princi
31、ples and means by which these were obtained. NOTEA prediction of reliability, maintainability and availability characteristics can generally be seen as a multistage procedure. As an example, Appendix A is intended to clarify the principles of presentation of predictions. The procedure itself is not
32、to be considered as a standard. 3 Definition of terms The terms used in this standard are in accordance with the definitions in IEC Publication271: List of Basic Terms, Definitions and Related Mathematics for Reliability. 4 Contents of the presentation The presentation of information regarding a pre
33、diction of reliability, maintainability and availability characteristics shall be given in a report containing the items as stated in Table I. The depth of presentation (i.e. which and how many details to be given) is dependent on the purpose of the prediction. For a specific prediction not all proc
34、edure steps and conditions in Sub-clauses5.2 to5.10 are necessarily applicable. For example, a pure reliability prediction of a simple apparatus or software unit may proceed without any relation to maintenance. 5 Detail requirements of the presentation The following sub-clauses enlarge upon the spec
35、ific requirements listed in Table I. 5.1 Summary The object of the prediction, main use conditions, maintenance support policy and the result shall be summarized. Any fundamental, simplifying assumptions shall be stated. 5.2 Purpose of prediction The aim of a prediction may vary, such as to provide
36、a basis for specification work, design analysis or planning of maintenance. It may also be to call attention to weak points in the system and in the maintenance organization and to suggest possible improvements. The intention is to govern the choice of reliability measures, methods of analysis, data
37、 sources, type and depth of presentation of results, etc. Therefore, the purpose of the prediction and the relationship between the prediction and any other part of the reliability, maintainability and availability programme shall be clearly stated. 5.3 Object of prediction Information needed to ide
38、ntify completely the object of the prediction shall be stated. This should, if applicable, include: a) system/equipment/software program/module/component type and specification, including development status; b) maintenance support policy; c) level of maintenance (in case of maintainability predictio
39、n). Where prediction includes assumption of human performance and skill these shall be properly described and quantified to permit proper measurement in system or equipment performance evaluation. Relevant documented information, such as descriptions and diagrams, shall be included or at least refer
40、enced. 5.4 Characteristics The system or equipment reliability, maintainability and availability characteristics which constitute the final objective of the prediction, shall be stated. Each characteristic shall be defined in one of the following ways: a) by reference to IEC Publication271; b) expli
41、citly in the prediction report; c) by reference to relevant system or equipment documents, such as specifications of reliability, maintainability and availability requirements. 5.5 Requirements and conditions Where possible all predictions should be based on predetermined requirements and conditions
42、.BS5760-12:1993 2 BSI 02-1999 Table I Required information Information Sub-clause Predicted characteristics Reliability Maintainability Availability Maintained items with redundancy Other items Summary 5.1 R R R R Purpose of prediction 5.2 R R R R Object of prediction 5.3 R R R R Characteristics 5.4
43、 R R R R Requirements and conditions 5.5 System/equipment functions 5.5.1 R R C/R R Failure definitions 5.5.2 R R C/R R Quality/reliability programme 5.5.3 R R N/A R Environmental conditions 5.5.4 R R C/R R Operational conditions 5.5.5 R R N/A R Definition of maintenance actions 5.5.6 R N/A R R Prev
44、entive maintenance conditions 5.5.7 R R R R Corrective maintenance conditions 5.5.8 R N/A R R Maintenance support conditions 5.5.9 R N/A C/R R Analysis 5.6 Reliability structure analysis 5.6.1 R R C/R R Stress analysis 5.6.2 R R N/A R Maintainability analysis 5.6.3 R N/A R R Maintenance support anal
45、ysis 5.6.4 R N/A C/R R Models 5.7 Reliability 5.7.1 Structure model 5.7.1.1 R R C/R N/A Model adaptation 5.7.1.2 R R N/A N/A Mathematical model 5.7.1.3 R R N/A N/A Maintainability 5.7.2 Structure model 5.7.2.1 C/R N/A R N/A Model adaptation 5.7.2.2 N/A N/A R N/A Mathematical model 5.7.2.3 N/A N/A R
46、N/A Availability 5.7.3 Structure model 5.7.3.1 N/A N/A N/A R Model adaptation 5.7.3.2 N/A N/A N/A R Mathematical model 5.7.3.3 N/A N/A N/A R Data sources 5.8 Reliability data 5.8.1 R R C/R R Maintainability data 5.8.2 R N/A R R Maintenance support data 5.8.3 R N/A C/R R Calculation principles 5.9 R
47、R R R Prediction results 5.10 R R R R R = Required C/R = Conditionally required N/A = Not applicableBS5760-12:1993 BSI 02-1999 3 5.5.1 System/equipment functions A system or equipment may be intended to function in many modes or to carry out sequences of functions. Any such function or sequence of f
48、unctions, covered by the prediction, shall be stated. Any function or equipment excluded from the prediction shall be identified and the reason given. 5.5.2 Failure definitions The reliability and availability characteristics are generally dependent on the failure definitions used. The applicable de
49、finitions of failures of the system or equipment shall therefore be stated. Failure definitions shall also be stated for all items for which quantitative data are used in the prediction models. 5.5.3 Quality/reliability programme The quality and maturity of the system or equipment shall be stated, for instance, in terms of: a) system or equipment burn-in; b) reference to quality/reliability programme of system or equipment and components; c) component screening. Any assumption regarding reliability or maintainability growth shall be state
