Inspection Intervals for Condition-Maintained Items Which Fail in an Obvious Manner
- 1 April 1979
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Reliability
- Vol. R-28 (1) , 85-89
- https://doi.org/10.1109/tr.1979.5220494
Abstract
Replacement theory suggests items with non-increasing hazard rate should be left to fail. This ignores the possible value of inspections to obtain warnig of pending failure when restorative maintenance can be performed more cheaply than failure repair. Equations are developed for inspection schedules for items with known base distribution of self-announcing failures. In optimization, two simplifying assumptions are made: 1) Equal conditional probability of failure in any interval between inspections, given survival to start of interval (equal interval-risk) gives a near-optimal schedule. 2) The fraction of failures prevented by inspection is a function only of the interval-risk under failure-only maintenance. Results tend to justify traditional schedules and urge better supervision of maintenance.Keywords
This publication has 3 references indexed in Scilit:
- Impact of the Frequency of Technician Visits On Facility Failure RateIEEE Transactions on Reliability, 1977
- A survey of maintenance models: The control and surveillance of deteriorating systemsNaval Research Logistics Quarterly, 1976
- A Nearly Optimal Inspection PolicyJournal of the Operational Research Society, 1972