DETERMINATION OF A MATHEMATICAL MODEL FOR ESTIMATING TRACTOR REPAIR AND MAINTENANCE COSTS

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AJABSHIRCHI OSKUI Y.; RANJBAR I.; ABBASPOUR M.H.; VALIZADEH M.; ROUHANI A.A.

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Journal: JOURNAL OF AGRICULTURAL KNOWLEDGE Year:2006 | Volume:16 | Issue:3 Page(s): 257-267

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Title

DETERMINATION OF A MATHEMATICAL MODEL FOR ESTIMATING TRACTOR REPAIR AND MAINTENANCE COSTS

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Keywords

ACCUMULATED SERVICE HOURSQ3

MATHEMATICAL MODELQ3

REPAIR AND MAINTENANCE COSTSQ4

Abstract

Since variations in REPAIR AND MAINTENANCE COSTS are excessively dependent on current conditions, so a standard relationship cannot be suggested for these variables, for example in the case of depreciation costs. But estimation of these costs at acceptable level can be made by fitting a MATHEMATICAL MODEL based on previous data. For fitting relationships between accumulated hours of service and accumulated costs of repair and maintenance, 42 two-wheel drive tractors in four models: Massey Ferguson 285, John Deere 3140, John Deere 4450, and Fait, working actively at Kesht & Sanat Astan Ghodse Razavi farms, were chosen. Carrying out regression analysis and considering the significance of regression coefficients, exponential model for the first part of useful life and quadratic model for remaining life period is suggested for Massey Fergusen 285 and John Deere 3140 tractors. Power based and exponential models were recommended for John Deere 4450 and Fiat tractors, respectively. Finally, for all two wheel tractors the power and quadratic model were considered as the most desirable for the first period of life and remaining life period, respectively. Comparisons of fitted curves among tractor models indicated that REPAIR AND MAINTENANCE COSTS as a percent of purchase price for four tractor models were in the ascending order of John Deer 4450, John Deer 3140, Massey Ferguson 285, and Fiat, respectively. This result may be related to the design quality and manufacturing procedures which can affect on reliability of tractors.

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APA: Copy

AJABSHIRCHI OSKUI, Y., RANJBAR, I., ABBASPOUR, M.H., VALIZADEH, M., & ROUHANI, A.A.. (2006). DETERMINATION OF A MATHEMATICAL MODEL FOR ESTIMATING TRACTOR REPAIR AND MAINTENANCE COSTS. JOURNAL OF AGRICULTURAL KNOWLEDGE, 16(3), 257-267. SID. https://sid.ir/paper/28808/en

Vancouver: Copy

AJABSHIRCHI OSKUI Y., RANJBAR I., ABBASPOUR M.H., VALIZADEH M., ROUHANI A.A.. DETERMINATION OF A MATHEMATICAL MODEL FOR ESTIMATING TRACTOR REPAIR AND MAINTENANCE COSTS. JOURNAL OF AGRICULTURAL KNOWLEDGE[Internet]. 2006;16(3):257-267. Available from: https://sid.ir/paper/28808/en

IEEE: Copy

Y. AJABSHIRCHI OSKUI, I. RANJBAR, M.H. ABBASPOUR, M. VALIZADEH, and A.A. ROUHANI, “DETERMINATION OF A MATHEMATICAL MODEL FOR ESTIMATING TRACTOR REPAIR AND MAINTENANCE COSTS,” JOURNAL OF AGRICULTURAL KNOWLEDGE, vol. 16, no. 3, pp. 257–267, 2006, [Online]. Available: https://sid.ir/paper/28808/en

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