It is essential to believe that the design of an item establishes its potential reliability and maintainability. It is a fact of life that the transition from drawings to hardware always results in achieved levels lower than the original design objectives. It is therefore necessary to design to specified levels of reliability and maintainability higher than the field requirements and to follow up with assurance activities aimed at minimising the failures which arise during manufacture and use. Figure 1.1 illustrates the concept of a reliability level fixed by the ‘drawings’ and a lower field level due to the many failure possibilities arising from manufacture and subsequent use. The author makes no apology for repetition since this is fundamental to Reliability Engineering. This chapter will outline the activities and techniques which can be used both in design, to develop equipment which can meet the R and M objectives and also in manufacture and use, to minimise failures.
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- Design and Assurance for Reliability and Maintainability
BSc, C.Eng, FIEE, FIQA David J Smith
- Macmillan Education UK
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