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《Journal of Shanghai Jiaotong University》 2007-05
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A Dynamic Opportunistic Preventive Maintenance Model for a Multi-unit Series System with Consideration of Imperfect Maintenance Effect

ZHOU Xiao-jun~1,SHEN Wei-bing~(1,2),XI Li-feng~1,LEE Jay~3(1.School of Mechanical Eng.,Shanghai Jiaotong Univ.,Shanghai 200240,China;2.Sewerage Management Office of Shanghai,Shanghai 200231,China;3.School of Eng.,Univ.of Cincinnati,Cincinnati OH 45221-0072,Ohio,USA)  
Based on the single-unit imperfect PM(preventive maintenance) model with consideration of combing the age reduction factor and the hazard rate increase factor,a reliability-centered dynamic opportunistic PM policy for a multiunit series system was developed.Whenever one of the units reaches its reliability threshold,an imperfect PM action has to be performed on the unit and the whole system must stop.At that time PM opportunities arose for the other units.The optimal combined preventive maintenance activities were determined by maximizing the short term cumulative OM(opportunistic maintenance) cost saving for the whole system.Numerical examples were illustrated to show how the proposed approach works.The simulation results show that this maintenance model satisfies the condition that system information is only available over a short term.It can provide a decision support for maintenance scheduling for multi-(unit) series systems.
【Fund】: 上海市登山计划项目(06DZ11202)
【CateGory Index】: TP18
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