Citation

Wang H, Pham H. Int. J. Reliab. Qual. Safety Eng. 1996; 3(2): 119-135.

Affiliation

Department of Industrial Engineering, Rutgers University, Piscataway, New Jersey

Copyright

(Copyright © 1996, World Scientific Publishing)

DOI

10.1142/S0218539396000090

PMID

unavailable

Abstract

This paper proposes three age-dependent preventive maintenance models with imperfect repair and/or imperfect preventive maintenance (pm). In these models imperfect repair is treated in a way that after repair the lifetime of a unit will decrease to a fraction of its immediately previous one and its repair time will increase to a multiple of immediately previous one. In this paper, the expected maintenance cost rate and asymptotic average availability are derived with a consideration that the maintenance and repair times are not negligible. The optimum maintenance policies are then determined for the three imperfect maintenance models respectively. A class of related optimization problems is also discussed. Finally, a numerical example is presented to illustrate the results.