1、BRITISH STANDARD BS5760-10.2: 1995 IEC605-2: 1994 Reliability of systems, equipment and components Part10: Guide to reliability testing Section10.2 Design of test cyclesBS5760-10.2:1995 This British Standard, having been prepared under the directionof the Management Systems Sector Board (S/-), waspu
2、blished under the authorityof the Standards Boardand comes into effect on 15February1995 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference QMS/23 Draft for comment84/26500DC ISBN 0 580 23866 0 Committees responsible for this British Standard The prepar
3、ation of this British Standard was entrusted to Technical Committee QMS/23, Reliability and maintainability systems, upon which the following bodies were represented: AEA Technology Association of Consulting Engineers Association of Project Managers British Gas plc British Railways Board British Tel
4、ecommunications plc City University Civil Aviation Authority Consumers Association Cranfield University Design Council Electricity Association Federation of the Electronics Industry GAMBICA (BEAMA Ltd.) Institute of Quality Assurance Institute of Risk Management Institution of Electrical Engineers I
5、nstitution of Mechanical Engineers Institution of Plant Engineers London Underground Ltd. Mercury Communications Limited Ministry of Defence National Computing Centre Ltd. Railtrack Railway Industry Association Royal Institution of Chartered Surveyors Royal Statistical Society Safety and Reliability
6、 Society Society of Environmental Engineers Society of Motor Manufacturers and Traders Limited University of Bradford University of Technology, Loughborough West Midlands Enterprise Board Amendments issued since publication Amd. No. Date CommentsBS 5760-10.2:1995 BSI 03-1999 i Contents Page Committe
7、es responsible Inside front cover National foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Relations between test conditions and conditions of use 2 5 Description of the conditions of use 2 6 Procedure for the design of test cycles 3 7 Summary of documentation of a re
8、liability test cycle 7 Annex A (informative) Worked example 10 Figure 1 Evaluation of severities 5 Figure 2 Simple test cycle 9 Figure A.1 Final test cycle 16 Table 1 Climatic parameters 3 Table 2 Mechanical parameters 3 Table 3 Interrelationships between parameters or severities 4 Table 4 Examples
9、of relative durations 6 Table A.1 Untitled 10 Table A.2 Untitled 10 Table A.3 Master table 13 Table A.4 Untitled 14 Table A.5 Untitled 14 Table A.6 Untitled 15 List of references Inside back coverBS5760-10.2:1995 ii BSI 03-1999 National foreword This Part of BS5760 has been prepared by Technical Com
10、mittee QMS/23. It is identical with IEC605-2:1994 Equipment reliability testing Part2: Design of test cycles, published by the International Electrotechnical Commission (IEC). This Part provides a general procedure for design of test cycles, where no applicable test cycles can be found in BS5760-13.
11、1. It applies to the design of operating and environmental test cycles referred to in BS5760-10.1. The resulting test cycle should be included in the detailed reliability test specification. Tests that include cycles designed according to this standard are not intended to replace ordinary tests such
12、 as qualification tests, functional performance tests and environmental tests. BS5760 provides comprehensive guidance on many aspects of reliability management. Fourteen Parts of this standard have been published and these may be summarized as follows: Part 0: Introductory guide to reliability. This
13、 Part provides guidance to senior management and non-specialists on the importance of reliability 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
14、 the essential features of a comprehensive reliability and maintainability programme to produce 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 and p
15、rovision of data, and the concepts of redundancy 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
16、development of reliability in new and existing items. This Part provides detailed guidance 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 progr
17、ammes for reliability growth. This Part describes procedures to expose and remove weakness 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 failur
18、es. Part 7: Guide to fault tree analysis. This Part gives guidance on the application of fault 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
19、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 outlined. Part 10: Guide to reliability testing. Section 10.1: General requirements. This Section provides guidance o
20、n general principles, procedures and considerations for reliability testing in the laboratory and in the field. Section 10.3: Compliance test procedures for steady-state availability. This Section provides guidance on techniques for testing the availability performance of frequently maintained items
21、 under defined conditions. Section 10.5: Compliance test plans for success ratio. This Section gives procedures for preparing and applying compliance test plans for success ratio or failure ratio. Plans are provided for three main types of test.BS 5760-10.2:1995 BSI 03-1999 iii NOTEFurther Sections
22、of Part10 based on other Parts of IEC605 and related IEC standards are also planned. Part 11: Collection of reliability, availability, maintainability and maintenance support data from the field. This Part provides guidelines for the collection of data relating to reliability, availability and maint
23、enance support performance of items operating in the field. It deals in general terms with the practical aspects of data collection and presentation and briefly explores the related topics of data analysis and presentation of results. Part 12: Guide to the presentation of reliability, maintainabilit
24、y 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 prediction information are listed and explained with the object facilitating comparisons between project
25、s and reports. Part 13: Guide to reliability test conditions for consumer equipment. Section 13.1: Conditions providing a low degree of simulation for indoor portable equipment. Section 13.2: Conditions providing a high degree of simulation for equipment for stationary use in weatherprotected locati
26、ons. Section 13.3: Conditions providing a low degree of simulation for equipment for stationary use in partially weatherprotected locations. Section 13.4: Conditions providing a low degree of simulation for equipment for portable and non-stationary use. Part 14: Guide to formal design review. This P
27、art provides guidelines for planning and conducting design reviews. Much of the guidance given is widely applicable and is relevant to the general conduct of design reviews but it also includes details of the specific contributions to be made by various specialists. Further Parts of BS5706 are envis
28、aged in order to provide guidance on other techniques of reliability management. A further Part is in the process of being drafted, and this is as follows. Part8 1) : Guide to the assessment of reliability of systems containing software. This Part will provide guidance on the assessment of reliabili
29、ty of systems containing software. 1) Currently published as a Draft for Development, DD198:1991.BS5760-10.2:1995 iv BSI 03-1999 Guidance on specific aspects of maintainability is provided in the various Parts of BS6548 Maintainability of equipment. A British Standard does not purport to include all
30、 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. Cross-references International standard Corresponding British Standard IEC50(191):1990 BS47
31、78 Quality vocabulary Section3.2:1991 Glossary of international terms (Identical) IEC68 BS2011 Environmental testing (most Parts identical) IEC605-1:1978 BS5760 Reliability of systems, equipment and components Section10.1:1993 General requirements (Identical) IEC721-1:1990 BS7527 Classification of e
32、nvironmental conditions Part1:1991 Environmental parameters and their severities (Identical) IEC721-2 BS7527 Classification of environmental conditions Part2: Environmental conditions appearing in nature (all Parts identical) IEC721-3 BS EN60721-3 Classification of environmental conditions Part3: Cl
33、assification of groups of enviromental parameters and their severities (all Parts identical) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages1to16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may ha
34、ve had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS5760-10.2:1995 BSI 03-1999 1 Introduction A test cycle is a sequence of different operating and environmental test conditions which are based upon actual conditions of use, as defined, for exampl
35、e, by the relevant product specification. The equipment undergoing reliability testing is normally subjected to repeated test cycles. The number of cycles will depend on the accumulated relevant test time, as required by the selected compliance test plan of IEC605-7, or as suitable for determination
36、 testing according to IEC605-4. The step-by-step procedure described here is intended for any specific equipment to be tested, when it is considered necessary to simulate closely the real conditions of use of the equipment. It applies fully to laboratory testing, but may be applied to field testing,
37、 in so far as conditions can be controlled, with respect to operating conditions only (including load, supply, etc.). 1 Scope This part of IEC605 provides a general procedure for design of test cycles, where no applicable preferred test cycles can be found in IEC605-3. It applies to the design of op
38、erating and environmental test cycles referred to in 8.1 and 8.2 of IEC605-1. The resulting test cycle should be included in the detailed reliability test specification. Tests which include cycles designed according to this standard are not intended to replace ordinary tests such as qualification te
39、sts, functional performance tests and environmental tests. Pre-exposure tests may in some cases be necessary before commencing the test cycles designed by the methods of this standard. The basis of the decision as to whether to include pre-exposure tests is outside the scope of this standard. 2 Norm
40、ative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC605. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based o
41、n this part of IEC605 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC50(191):1990, International Electrotechnical Vocabulary (IEV)
42、Chapter191: Dependability and quality of service. IEC68, Environmental testing. IEC605-1:1978, Equipment reliability testing Part1: General requirements. Amendment No.1(1982) IEC721-1:1990, Classification of environmental conditions Part1: Environmental parameters and their severities. IEC721-2, Cla
43、ssification of environmental conditions Part2: Environmental conditions appearing in nature. IEC721-3, Classification of environmental conditions Part3: Classification of groups of environmental parameters and their severities. 3 Definitions For the purpose of this part of IEC605, the terms and defi
44、nitions of IEC50(191) apply, in addition to the following terms and definitions given below: 3.1 phase state of usage and exposure to environment 3.2 environmental conditions physical and chemical conditions external to the equipment to which it is subjected at a certain time, comprising a combinati
45、on of environmental parameters with stated severities NOTEThis is in line with IEC721-1, clause3. 3.3 operating conditions equipment functional conditions comprising a combination of operating parameters with stated severities 3.4 parameter (operating or environmental) chemical or physical quantity
46、or combination of quantities defining the type of operational or environmental stress NOTEExamples of operating parameters are load and power supply (see5.1). Examples of environmental parameters are ambient temperature and vibration (see5.2). 3.5 severity (of operating or environmental parameter) o
47、ne or more quantities describing the operating or environmental parameter NOTE 1This is in line with IEC721-1, clause3. NOTE 2The severity defines the stress level. Examples of severities are: power load35W, voltage drop 10% and frequency deviation of power supply+ 2%, ambient temperature+70C, sinus
48、oidal vibration50m/s 2at20Hz to500Hz.BS5760-10.2:1995 2 BSI 03-1999 3.6 severity class interval of severity between two stated limits within the relevant severity range (see Figure 1) NOTEAn example of a severity class is ambient temperature+15C to+35C. 3.7 test severity severity of operating or env
49、ironmental parameter applied to the item(s) during testing 3.8 representative severity test severity judged to give a failure rate approximating to the average for a severity class 4 Relations between test conditions and conditions of use Generally, a good correlation between test and use reliability is desired. It is thus necessary that the test conditions are properly correlated to those to which the equipment is subjected in real use. These conditions may, however, be very complex and not
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