Appropriate Reliability Metric for Military and Commercial Applications

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Appropriate Reliability Metric for Military and
Commercial Applications

• Name Elike Dougna
• Level Junior
• Number of Semesters Participated 1
• Date of Submission May 7 2004
• Advisor Dr Geoffrey Okogbaa
• Department Industrial Engineering

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Project

• Commercial product reliability driven by
  liability, coast goals, competitions etc..
• Military system reliability the system must be
  highly reliable, available and maintainable.
• Mean Time Between Critical Failures (MTBCF) is
  used as the mission reliability metric.
• Mean Time Between Failure (MTBF) is used as the
  logistics reliability metric.
• Look at the differences in the resulting system
  reliability and see if the numbers are acceptable
• If the system or product does not include
  redundancy, these metrics are equal.

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Definitions

• MTBCF Measure of a systems ability to complete
  a mission, its use in the case where components
  are replaced and not repaired. Its improved by
  redundancy.
• MTBF Measure of a systems ability to operate
  without logistics support, its use in application
  that permit repairs and its degraded by
  redundancy.
• Reliability Ability of a system to perform a
  specified task, for a specified time, in a
  specified environment.
• Failure Lack of ability of a component,
  equipment, sub system, or system to perform its
  intended function. There is four categories
  Catastrophic, Critical, Marginal, Minor

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Differences in MTBCF and MTBF