نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار گروه مهندسی مکانیک ماشین های کشاورزی دانشگاه فردوسی مشهد
2 استادیار گروه مهندسی مکانیک ماشین های کشاورزی و مکانیزاسیون دانشگاه شهید چمران اهواز
کلیدواژهها
عنوان مقاله English
نویسندگان English
Replacement of tractors is a very difficult task. Farm managers often need to make such economic decisions about their machines. Repair and maintenance expenditures can have significant impacts on these economic decisions and forecasts. The purpose of this research was to identify a regression model that can determine economic life of two-wheel drive tractors. The study was conducted using empirical data on 60 two-wheel drive tractors from Astan Ghodse Razavi agro-industry during the years 1988 to 2005. A power model was selected as the best model for prediction of repair and maintenance costs. Based on the power model, the cumulative cost model (CCM) was used to predict the tractors economic life. 29025 hours was predicted as the economic life of the tractor by the CCM model, while according to cost minimization model (CMM) this parameter was equal to 27773 hours.
کلیدواژهها English
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