Mm. Hosseini et al., A hybrid maintenance model with imperfect inspection for a system with deterioration and Poisson failure, J OPER RES, 50(12), 1999, pp. 1229-1243
A new maintenance model for a system with both deterioration and Poisson fa
ilures is proposed. In this model, at any time-instant Gs and when the syst
em is operating, one of the following decisions may be taken: (1) stop the
system to perform a scheduled minimal maintenance; (2) stop the system to p
erform an inspection; and (3) no action and allow the system to go on with
its operation. Following an inspection, based on the deterioration conditio
n of the system, one of the following decisions may be taken: (a) if the sy
stem is in a 'good' condition, no maintenance action is taken and a number
of periodic minimal maintenance activities are scheduled, starting T1 later
; (b) if the system is in an 'intermediate' condition, a minimal maintenanc
e is performed and an inspection is scheduled for T2 later (T2 < T1); and (
c) if the system is in a 'bad' condition, a major maintenance is performed
and a number of periodic minimal maintenances are scheduled starting T1 lat
er. In addition, a deterioration failure is restored by a major repair and
a Poisson failure is restored by a minimal repair. Generalised stochastic P
etri nets are used to represent and analyse the model, which represents a '
composite' maintenance strategy. Based on maximisation of the throughput of
the system the benefit of this model compared to (1) an equivalent periodi
c inspection model and (2) an equivalent planned scheduled maintenance mode
l, is demonstrated. This study presents a new hybrid model with a general f
ramework for incorporating various types of maintenance policies. Also by i
ncorporation of a number of features, this model will be more applicable to
real world technical systems (complex systems), although it can be applied
to individual components that are part of a complex system.