Optimal maintenance policy for a two-unit parallel system using proportional hazards model

In this paper, we present an optimal opportunistic maintenance policy for a two-unit parallel system, where economic dependency exists between the units. Both units are subject to deterioration and condition monitoring and the units operate independently. At each inspection epoch, condition information for both units is available. The failure rates of both units are described by the age and by the covariate values obtained at inspection times. …