Optimal inspection and replacement policies for multi-state deteriorating systems

Article Abstract:

A phase-type method for deriving optimal inspection and replacement policies for semi-Markovian deteriorating systems is introduced. Acyclic phase-type distributions, which are the distribution of time until absorption in a finite state Markov process with an upper triangular infinitesimal generating matrix, approximate the general sojourn time distributions of a semi-Markovian maintenance model. The optimal state-dependent and state-age-dependent inspection and replacement policies are derived using algorithms. Procedures for implementing the optimal policies to semi-Markovian deteriorating systems were also formulated.

Purchasing, Markov processes, Replacement of industrial equipment

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Optimal decision making in a maintenance service operation

Article Abstract:

Purchasing of an industrial equipment requires consideration of the different services offered by maintenance providers. Some providers offer warrantees for the estimated total useful life of an equipment. Others do not provide warrantees and charge a specific fee every time the equipment is repaired. For an industry that relies on the particular equipment for revenue, the purchasers should also consider the service time guaranteed by the maintenance provider. The latter reimburses the customer for costs incurred from failing to repair the equipment within the agreed time.

MISCELLANEOUS REPAIR SERVICES, Repair Services NEC, Other Personal and Household Goods Repair and Maintenance, Warranty, Services, Repair services industry, Repair services

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A generalized group maintenance policy

Article Abstract:

A two-phase maintenance policy for a group of independent identical repairable units which includes minimal repair, overhaul, replacements and downtime costs is proposed. The first phase is the time-interval and the second phase is the time interval. Failures of individual units are classified into two, namely, Type I or minor failures which are solved by minimal repairs and Type II or catastrophic failures which are either replaced or left idle. A group maintenance is performed either upon the expiration of a time interval or upon the kth idle, whichever comes first.

Repairing

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