Journal of Shanghai Jiaotong University ›› 2016, Vol. 50 ›› Issue (05): 736-741.

Previous Articles     Next Articles

Preventive Maintenance for Machine Operating in Dynamic Environmental State

HU Jiawen,JIANG Zuhua,HAN Lijie   

  1. (School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2015-05-26 Online:2016-05-28 Published:2016-05-28

Abstract: Abstract: This paper dealt with a single machine system operating at timevarying 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 timevarying environmental state at a finite interval.

Key words: Key words: preventive maintenance (PM), environmental state, accelerated life model (ALM), imperfect maintenance, availability

CLC Number: