Maintenance is an integral part of business operations that spans the whole spectrum of activities from acquisition to retirement of production unit and its equipment. But, some inventories are required to operate the production system efficiently in the case of preventive maintenance. This reduction led some people to adopt the wrong notation that inventory should be totally eliminated. A numerical example is presented to illustrate the development of the model and sensitivity of the model is analyzed.Īfter the introduction of just-in-time production system in the literature of classical inventory, it has been widely accepted due to considerable reduction in material inventories. The optimal just-in-time buffer is determined to minimize the system running cost by considering the holding cost of perfect and imperfect quality items and shortage cost of perfect and imperfect quality items. The percentage of imperfect quality item is also random. The period of preventive maintenance depends on the nature and condition of the production unit which is random in nature. During the shutdown period just-in-time buffers for both the perfect and imperfect quality items are needed to continue the normal operation. Since preventive maintenance is an essential part of production structure, performing of regular preventive maintenance results in a shutdown of the production unit for a period of time to enhance the condition of the production unit at an acceptable level. This paper deals with a just-in-time manufacturing environment which produces perfect quality items with defective items (a percentage of whole products) irrespective of the nature of the preventive maintenance.
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