An Economic Replacement Model

Abstract

The corresponding characteristic quantities for the economic lifetime-method are Numerical exaniple: Let be C = GYOO, B = 626 and a + b Figure 1 shows the per cent gain 2If u is sufficiently large this gain exceeds 25%! For the same average repair cost development and replacement cost as in this exaniple the application of optimum repair limit8 for each repair instead of using the economic lifetime leads to cost savings coming t o 6% [ 2 , 3 ] . &,-c Fig. 1. Cornparision of effectivity of repair limit replacement policy and economic lifetime method K e f e r e n c e s 1 BEICHELT, I?., Effektive Planuiiy prophylaktischer MaDnahmen in der Iustandhaltung, Berlin, VEB Verlag Technik 1979. 2 BEICHXLT, P.; FISCHER, K., General failure model applied to preventive maintenance policies, IEEE Trans. on Reliability R-

A unifying treatment of replacement policies with minimal repair

“…Sincep as given by (30) does not depend on time, formula (14) can be applied for computing the corresponding maintenance cost rate KIo(c). But an important peculiarity of the repair cost limit model has to be taken into account: The mean repair cost c, for removing a type 1 failure depends now on c and, hence, on p:…”

Optimum preventive maintenance and repair limit policies maximizing the expected earning rate

“…We also give an upper limit of an optimum préventive maintenance time /*. An alternative technique of préventive maintenance of the system is the repair limit policies of a failed unit discussed by Hastings et ai [5,7,8], and Nakagawa and Osaki [11]. A failed unit is replaced if the repair is not completed within a repair limit time t 0 .…”

A Repair-Time Limit Replacement Model with Imperfect Repair

“…This paper concerns a repair-time limit replacement model. The repair-limit replacement problems are considered by Drinkwater and Hastings (1967). Hastings (1968Hastings ( , 1969Hastings ( , 1970, Lambe (1974) and White (1989) formulate the repair limit replacement problems by applying the dynamic programming.…”