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Reliability analysis
A variety of reliability problems have been pursued with statistics colleagues and external collaborators. A book on the analysis of reliability data was published by Chapman and Hall (1991a). An EPSRC-funded research project (SMST) completed in 2002 concerned the modelling and analysis of degradation data. Royal Aerospace Establishment (1982-1993). Collaboration with the RAE (later DRA) led to the development of probabilistic models aimed at determining in-service inspection requirements for airworthiness. Related work included (i) the sensitivity of these requirements to variations in the underlying crack propagation process and the reliability of NDI procedures, (ii) a comparison of the simulation methodology with the customary MOD procedure for determining inspection intervals, and (iii) the construction of safe S-N curves (Fatigue Fract. Engng. Mater. Struct., 1992). The determination of in-service inspection intervals and the construction of safe S-N curves were both incorporated into MOD Def Stan 00-970 regarding design and airworthiness requirements for service aircraft. Rolls-Royce (1989-92). This work was mainly concerned with the design and analysis of non-destructive testing (NDT) methods aimed at gas turbine discs. This work led to new results on parsimonious models for NDT reliability data based on post-inspection flaw size distribution and safe cyclic life (Int. Statist. Review, 1995), presented at the ISI, 1993.
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