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| Preventive Maintenance for Machine Operating in Dynamic Environmental State |
| HU Jiawen,JIANG Zuhua,HAN Lijie
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| (School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Abstract： This paper dealt with a single machine system operating at timevarying environmental state. Assuming that the failure time distribution of the system can be represented by the accelerated life model (ALM) at different environmental states, the evolution model of the hazard rate was built when environmental state changes. The time interval operated at different environmental states was converted to the equivalent working time at the baseline state, the imperfect maintenance model was proposed at the dynamic environmental state with the recursion decline factor and failure rate ascending factor. Considering the fact that the future environmental state was unknown, and taking the availability of current PM interval as an objective and a given reliability threshold as a constraint, the optimal PM intervals were calculated dynamically along with variable environmental state. The results of a numerical example indicate that the PM strategy is valid for a single machine at timevarying environmental state at a finite interval.
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Received: 26 May 2015
Published: 28 May 2016
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