Scheduling Maintenance Operations which cause Age-Dependant Failure Rate Changes,
Abstract
We consider optimization of schedules for maintenance or repairs, in order to minimize long term average operating cost or to maximize availability. The novelty here is that the failure rate after a maintenance operation is a function of the system's previously expended lifetime. This generalizes earlier work by others on the simpler case where the future rate depends only on the number of previous repairs, but not on the times when they took place. The underlying lifetime distributions are assumed to have the Weibull form and two classes of maintenance strategies are considered. The first case optimizes a set of successive maintenance intervals where a replacement by a new system is made. In the second case, the period of periodic maintenance is optimized numerically. The main contribution in that case is the formulation of the new failure rate model, and the efficient organization of the optimization calculations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1982
- Accession Number
- ADA117267
Entities
People
- B. Ebrahimian
- J. Chan
- Leslie M. Shaw