Advances and Applications in Statistics
Volume 65, Issue 2, Pages 227 - 246
(December 2020) http://dx.doi.org/10.17654/AS065020227 |
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DETERMINATION OF THE OPTIMAL PERIOD FOR CARRYING OUT PREVENTIVE MAINTENANCE TO MINIMIZE EXPECTED TOTAL COST
Fuad S. Alduais
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Abstract: The essential objective of this research is to decide the optimal period for conducting the preventive maintenance operations (PM) for machines so as to minimize the expected total cost relying on data concerning the cost of repair or replacement activities (Cs), and the cost of preventive maintenance (Cr). Moreover, the reliability function is calculated for the machines before and after the maintenance operations are conducted considering that the data has a Weibull distribution. Also, the application is carried out on the real data representing the operating time of the machines between faults for some machines of the National Company for Sponge and Plastic Industry. Thus, the present research concluded that the preventive maintenance works to minimize the total expected cost of maintenance operations, raise the reliability of the machine, improve and increase the mean period of time for machine operation between faults (MTBF) in the case that the shape parameter is increased. However, if the shape parameter is fixed, then the preventive maintenance process is either useless or with no avail. |
Keywords and phrases: preventive maintenance, reliability function, Weibull distribution, failure rate, machines.
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