Abstract

An approach to determining an acceptable equipment replacement policy is proposed for the case where the operating cost, as a function of age of equipment and purchase date, is fully known. The complete model representing optimum behaviour over an infinite horizon is presented. Because of the computational difficulties involved in the analysis of this model, a sub-optimisation method is suggested, which replaces the infinite stage problem by a single stage problem, modifying the operating cost function to include a “technological opportunity cost”. A comparison of the consequences of this sub-optimisation in relation to the infinite stage model is presented for the purpose of ascertaining when the approximation suggested is valid.

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