Optimizing preventive maintenance for mechanical components using genetic algorithms

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Optimizing preventive maintenance for mechanical
components using genetic algorithms

• ??????? ??
• ??Yuo-Tern Tsai, Kuo-Shong Wang, and Hwei-Yuan
  Teng
• ??Reliability Engineering and System Safety,
  Vol. 74,
• pp.89-97, 2001
• ??????

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Outline

• Introduction
• Effect of 1P-maintenance to reliability
• Maintenance benefit analysis
• Genetic algorithms
• Case study
• Conclusion

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1. Introduction (1/3)

• ????????(corrective maintenance)?????(preventive
  maintenance)?
• ??????????(minimal repair-1C)?????(corrective
  replacement-2C)???
• ???????????(preventive maintenance-1P)?????(preve
  ntive replacement-2P)???

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1. Introduction (2/3)
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1. Introduction (3/3)

• ????,???????????????????,???????????????????,???
  ?????,??,?????????????????????????

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2. Effect of 1P-maintenance to reliability-2.1.
Dynamic reliability (1/2)

• Ao initial reliability A1 degraded factor
• Ao?A1????????????

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2.1. Dynamic reliability (2/2)

• mj-1 the improvement factor of 1P at the
  (j-1)-th PM stage
• t the effective age of component
• tp the maintenance interval

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2.2. Improvement factor assessment

• pij the probability of 1P activities taken
• dij the improvement level

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3. Maintenance benefit analysis (1/4)

• Crj the CM cost at the j-th stage
• C0 the mean cost of per CM action of the system
• Cp the PM cost
• Cpi 1P and 2P cost on subscript p1 and p2

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3. Maintenance benefit analysis (2/4)

• Tj1 the extended life of the system on the j-th
  stage
• Bm the unit-cost life of system
• Cs0 the acquired cost of the system
• Crn the CM cost occurred in the last life stage
  (from tj to Tj1)

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3. Maintenance benefit analysis (3/4)

• Bd the discarded life of system

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3. Maintenance benefit analysis (4/4)
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4. Genetic algorithms
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5. Case study-5.1. Problem formulation (1/3)

• ???????????????????????????????

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5.1. Problem formulation (2/3)

• Rs(t) the system reliability
• RC(t) the reliability of the surplus part of the
  system except the PM component

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5.1. Problem formulation (3/3)
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5.2. Result analysis (1/4)
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5.2. Result analysis (2/4)
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5.2. Result analysis (3/4)
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5.2. Result analysis (4/4)
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6. Conclusion

• ???????????1P?2P??????,??????????
• ???????(Dynamic reliability)???????????????????,??
  ????????
• ?????????(improvement factor)??,???1P??????2P?

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