• RELIABILITY MEASURES OF A COLD STANDBY SYSTEM WITH PRIORITY FOR OPERATION AND PREVENTIVE MAINTENANCE

Abstract

In this paper reliability measures of a two-unit cold standby system are obtained considering the concepts of preventive maintenance and priority. The unit fails completely either directly from normal mode or via partial failure. There is a single server who visits the system immediately as and when needed. The preventive maintenance of the unit is done after a maximum operation time (MOT) at its partial failure stage. Priority is given for operation to new unit over the partially failed unit. Also, preventive maintenance (PM) of the unit is preferred over the repair. All random variables are statistically independent. The time to failure and maximum operation time are exponentially distributed whereas the distributions of PM and repair times are considered as arbitrary with different probability density functions. The system model has been analyzed using semi-Markov process and regenerative point technique. The behavior of MTSF, availability and profit incurred to the system model is observed for particular values of various parameters and costs.