Bilevel control of degraded machining system with warm standbys, setup and vacation |
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Authors: | M Jain Rakhee Mahavir Singh |
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Institution: | Centre for Information and Decision Sciences, Dr. B.R. Ambedkar University, Khandari Campus, Agra 282002, India |
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Abstract: | In this paper, we study (N, L) switch-over policy for machine repair model with warm standbys and two repairmen. The repairman (R1) turns on for repair only when N-failed units are accumulated and starts repair after a set up time which is assumed to be exponentially distributed. As soon as the system becomes empty, the repairman (R1) leaves for a vacation and returns back when he finds the number of failed units in the system greater than or equal to a threshold value N. Second repairman (R2) turns on when there are L(>N) failed units in the system and goes for a vacation if there are less than L failed units. The life time and repair time of failed units are assumed to be exponentially distributed. The steady state queue size distribution is obtained by using recursive method. Expressions for the average number of failed units in the queue and the average waiting time are established. |
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Keywords: | Bilevel-policy Machine repair Warm standbys Queue size Vacation Startup time Recursive technique |
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