拖拉机最佳更新期计算问题之新探

A Study on the Optimum Replacement Period of Tractors

首先运用系统思想分析了拖拉机最佳更新期计算时的目标选择问题。在此基础上,分别给出了适用于不同情况的两种最佳更新期计算方法。 方法一适用于下列两种情况:(1)自用型拖拉机最佳更新期的计算;(2)代耕型或兼用型拖拉机,当拖拉机所有者和雇佣者都属于某一系统时,站在系统的整体角度,从系统的整体经济效益出发来计算拖拉机的最佳更新期。 方法二适用于代耕型或兼用型拖拉机,当站在拖拉机所有者的角度,从拖拉机所有者的经济利益出发来计算拖拉机最佳更新期的情况。

Target selection in calculating optimum replacement period of tractors is firstly considered according to the ownership and the use of tractors. Two calculation methods are then given respectively for different conditions. The first method is suitable for either of the following two conditions: 1) tractors are used by the owners themselves;2)tractors used for custom work with the owner and the hirer belonging to the same organization. The second method is suitable for tractors used for custom work and decision is made from the view point of optimizing the economical benefit of the tractor owners.