Studies On The Problem About Simulating State Transalation Of Agricultural Machinery System And Replacement Strategy

The different main illogicalities exited in the different period of agriculture mechanization development. That the economic efficiency would be increased was nowadays a main illogicality in the development of agriculture mechanization. There were a lot of factors involved in the economic efficiency of agriculture mechanization, but replacement of agriculture machinery system was a key factor. Supply exceeded demand for agriculture machinery along with its industrialization developing in China; at the same time, there was a part of agriculture machinery needed to be replaced through over fifty-year-developing. So replacement strategy of agriculture machinery was necessary to be researched. The origin of this paper was a research task of Education Department, and its number was [2002]40 of Education Department.Agriculture machinery system was in harmony composed of agriculture power system and machine system. Agriculture machinery system was important for agriculture producing. It was matter and tool of agriculture and indicating a agriculture moderation. The paper expatiated on significance and pressure of agriculture machinery replacement. To make agriculture machinery replacement advancing actively was helpful for stronger producing ability, producing quality, reducing running expenses, and increasing the whole economic efficiency of agriculture machinery. After thorough investigation of the literatures available, some problems about this field still needed to be researched. The paper' s contents included law and state simulation of agriculture machinery system, observation, control, stability of agriculture machinery system, selecting objection of economic life of agriculture machinery system, average economic life about a certain type of agriculture machineries, evaluate economy benefit of agriculture machineries replacement, decision-making method of agriculture machineries replacement, design the aided decision-system for replacement strategy of agriculture machineries and so on.The following main achievements were obtained through researching:The paper pointed out theory of state transfer of agriculture machinery system, and simulated the state transfer of agriculture machinery system. The paper gave definition and prove of observation, control and stability of agriculture machinery system., and discussed the law of agriculture machinery system. The paper first applies RGA to forecast some indexes of agriculture machinery replacement, and some indexes of agriculture machinery replacement were forecasted more accurately. The paper researched on getting and dealing with economical indexes of agriculture machinery. The paper pointed out a basic method calculating economic life ofagriculture machinery. The paper gave out replacement strategy model, namely method of unit and group of agriculture machinery. The paper designed the aided decision-system for replacement strategy of agriculture machinery of Suiling Farm on the basis of the above theories, which is help to make decisions for replacement of agriculture machineries system as a whole. Applying the aided decision-system in Suiling Farm proved the above theories to be correct, and proved the software designed to be steady and correct.These achievements of the paper may develop and eliminate the imperfections in the theory of replacement and model of agriculture machinery, thereby to guide more effectively for decision making and practical production.Some research methods were adopted such as theory analysis combining with practice, and applied synthetically theory of agriculture mechanization, technology economy, optimizing theory and aid decision-system theory.