Optimal just-in-time buffer inventory for regular preventive maintenance

Article Abstract:

Most manufacturing organizations, if not all, are trying to implement some of the ideas adopted by the just-in-time (JIT) philosophy, a philosophy that promises a continuous improvement in total productivity. Preventive maintenance, an essential element of the just-in-time structure, induced the idea of this paper. Performing regular preventive maintenance results in a shutdown of the production unit for a period of time to enhance the condition of the production unit to an acceptable level. During such interruption, a just-in-time buffer is needed so that normal operations will not be interrupted. The optimum just-in-time buffer level is determined by trading off the holding cost per unit per unit of time and the shortage cost per unit of time such that their sum is minimum. Keywords: Preventive; Maintenance; Buffer; Inventory; Just-in-time

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Optimal control of preventive maintenance schedule and safety stocks in an unreliable manufacturing environment

Article Abstract:

This paper revisits the economic manufacturing quantity (EMQ) model by Cheung and Hausman (Nav. Res. Logist. 44 (1997) 257) from the theoretical point of view, and develops a new stochastic model under somewhat different restrictive assumptions. The optimal policies, the order quantity and safety stock, are derived, respectively, so as to minimize the expected cost per unit time in the steady-state. Keywords: Economic manufacturing; Machine breakdown; Preventive maintenance; Safety stocks; Stochastic model

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Optimal continuous review policies for spare part provisioning with random lead times

Article Abstract:

The impact of stochastic lead times on the optimal policies was established based on an analysis of two types of continuous review cyclic models with random lead times and an expedited order. Numerical examples revealed that the uncertainty of the regular lead time greatly affects the optimal inventory policy. The insensitivity of inventory model under a complex delivery schedule with an expedited order to the optimal policy was also established.

Inventory Control, Models, Production management

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