7 Repairable Systems
Chapter Overview and Learning Objectives
- To understand the objective and definition of corrective maintenance and preventive maintenance.
- To learn a measure of repairable systems, such as the mean time between failure and mean time to repair.
- To understand the concept of availability and differentiate different availability measures, including inherence availability, achieved availability, and operational availability.
- To understand the fundamental concept of maintainability.
- To determine the optimal preventive maintenance schedule to minimize the total cost.
7.1 Corrective Maintenance
In previous chapters, we assumed that failed products were discarded and were not repaired to bring them back to their original condition. However, in real life, components are often repaired and returned to operation. In that case, the maintenance and availability of the components and systems are important concerns. We can explore several questions:
- How long does it take for the component to be repaired?
- What are the repair characteristics of the components (a repair probability distribution)?
- How often should we perform maintenance to maintain the desired reliability of the components or systems?
We could initially discuss maintenance. Maintenance can be categorized into corrective maintenance and preventive maintenance.
Corrective maintenance focuses on correcting the failures of the components. It is considered a reactive process because it is only conducted when ...
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