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Title: Sparse data inference for point process failure models incorporating multiple maintenance effects
Author: Kearney, James Rhys
ISNI:       0000 0004 2709 0640
Awarding Body: University of Salford
Current Institution: University of Salford
Date of Award: 2011
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The primary scenario within repairable system reliability estimation investigated is that of a single failure mode the likelihood of which occurring is supposed to be affected by maintenance activities of varying effect and degree. Since the structural composition of the systems considered are unknown, the models developed are simplifications premised either on a mechanistic conception of a maintenance action (the Proportional Renewal Model) or by empirically representing the effect of the maintenance action by the transference of a subset of system components from being in an unmaintained state to a maintained state with the reverse process determined by some decay process (Maintenance Decay Model). Maintenance actions are classified either as 'corrective' (CM) if undertaken in response to failure or as 'preventive' (PM) if elective. The datasets analysed in this work - collected in the petrochemical industry over a number of years - are typically sparse and contain observations of a number PM types. The interactions of different maintenance types on a single failure mode (one type of CM) are investigated and related to the problem of maintenance scheduling optimisation. Given the complexity of the models and the sparse nature of reliability data, statistical methods to assess the level of confidence in the model parameter required to incorporate diverse maintenance effects are compared with particular focus given to Bayesian methods of statistical inference which have the advantage of being able to incorporate the use of prior knowledge in the estimation procedure.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available