نویسندگان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Farm tractors are an unavoidable part of agricultural activity and it is desired that when failures accoured, the tractors get prepared at a minimum time and back to the farms. With an effective maintenance program, the costs of maintenance and machine downtime reduce at an acceptable value. In the current study, the life and maintenance distribution functions of a mechanized system including two MF???, two MF??? and two NewHolland ??? tractors were assessed. The maintainability of tractors and system reliability were analyzed in the next steps. Finally, a suitable maintenance system was proposed based on the queuing theory. Indeed, in the current study by combination of life and maintenance distribution functions and queuing theory, the capacity of a suitable maintenance system was estimated such that tractors with minimum downtime work continuously. The results showed Poisson function suitable for life and Exponential function suitable for maintenance. The two NewHolland ??? tractors consume around ??? hour more time for emergency maintenances compared to two MF??? tractors in around ???? hour life duration. The reliability of the system was ??% during ?? working hours with three available tractors. The suitable maintenance capacity was proposed around ?.? maintenance per working shift.
کلیدواژهها [English]
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