Smeitink, E.

distribution opportunity replacement block component control limit k 2 distribution function policy renewal approximation maintenance theorem model probability process dekker recurrence time density control limit smeitink lifetime failure control limit t figure weibull equation opportunity-based table value result recurrence theorem 3 block replacement n t r problem i n e control limit policy time t method solution preventively proof system 0.928 integration renewal function condition solution t ~ recurrence time distribution probability density function error strategy gamma expression state ~ b ~ decision support system paper analysis reliability maintenance opportunities notice research component lifetime integral optimality equation order curve interval algorithm optimality number point simulation yield c f m phase-type appendix