Calculation of Tractor’s Economical Life

Using multi-disciplinary unify of the systems engineering, the management study of using agricultural machinery and so on, this article carries on the discussion to the target selection question of computing the tractor economic life and its computation model. Respectively take the average unit work load expense slightly as the goal, the yearly average expense slightly for the goal, the yearly average net-income most greatly for the goal, the unit work load net-income most greatly carries on the elaboration for the goal to the tractor economic life estimation problem. The article produces under the different goal the community tractor economic life computation model and the single tractor economic life computation model. These new models have offered the new train of thought for studying the economic life further.