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Cost Optimizing System to Evaluate Reliability (COSTER)

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Technical rept. Jan 75-Dec 76

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Specific attention is currently being addressed to the overall cost of the reliability specification as early as the development stage in an equipments life cycle. In order to assess the impact of changes in an equipments reliability specification, it must be possible to predict and monitor the effects of such changes on an equipments reliability testing and field support costs. This research report elaborates the respective cost and reliability improvements resulting from six major reliability program efforts prior to an equipments field deployment. The six efforts are 1 the design review 2 the reliability prediction program 3 the failure mode, effects, and criticality analysis FMECA 4 the parts program, in which MIL-STD and high reliability parts are selectively used in place of commercially available parts 5 the reliability testing programs and 6 the Burnin test. One hundred sixty exhaustive policies are analyzed with respect to their cost and resultant reliability. Each policy is a specific combination of the reliability program tasks imposed. The total policy cost is the sum of the reliability program cost and the expected field support cost after the equipment is deployed. The Field Support costs are assumed inversely related to the reliability level, as measured by the Mean Time Between Failure MTBF, achieved prior to deployment. The model is computerized and sorts the total policy cost in ascending order. The optimal policy and the resultant MTBF corresponding to the minimum total cost are the outputs of the model. Author

Subject Categories:

  • Economics and Cost Analysis
  • Manufacturing and Industrial Engineering and Control of Production Systems

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