Evaluation of Economic Service Life for Agriculturl Machinery a by Using Fuzzy Data

Trial Calculations of the Series of Equal Payments Due at the End of Each Year for Wheel Tractors

Abstract

For the supporting of the renewal of agricultural machinery, the calculation method of the total cost of the series of equal payments due at the end of each year by using fuzzy data of annual operating time was analyzed. Furthermore, the series of equal payments due at the end of each year for wheel tractors, and the judgment of economic service life of them were discussed. As a result, it was clarified that the possibility of each the year incorporating economic service life and the degree of fuzziness of fuzzy data in such cases were evaluated by α-level set quantitatively. And it was pointed out that the series of equal payments due at the end of each year for wheel tractor for crop land field was less than the one for paddy rice field, and was severely affected by the annual operating time. Besides, it was clarified that the number of the year for the economic life increased as using more fuzziness data of annual operating time in trial calculations, and showed the possibility of the economic life prediction in real.