ABSTRACT
Chiang & Yuan (2001) and Wang & Zhang (2006) also propose similar maintenance models, aiming the optimization of the global cost, but consider that both the preventive and correctivemaintenances are not perfect. Yet, under the same optimizing objective, other authors propose models to multi-component systems. For example, Bris et al., (2003) present a plan of periodic maintenance for series and parallel systems, where the failures are only detected at inspections. Zequeira & Bérenguer (2005) develop an analogous maintenance policy for a parallel system with two components. Barros et al., (2006) add to the previous model, the possibility of the failures to be detected at the instant of its occurrence. In all of these works, the repairing times are neglected.
