自走式玉米收獲機(jī)總體結(jié)構(gòu)布局優(yōu)化設(shè)計(jì)與虛擬驗(yàn)證方法研究
[Abstract]:Corn is an important food crop in China, but the mechanization level of maize production is still low, especially the harvest link is lower. At present our country corn harvester manufacturer although many, but the mature model is not many. Therefore, how to develop a series of multi-function corn harvester which is suitable for our country's national conditions has become a key technical problem of agricultural machinery enterprises, universities and scientific research institutes in our country. In this paper, the self-propelled corn harvester is taken as the research object, and the optimization of its overall structure layout and its virtual verification are systematically studied in order to provide a reference for improving the design level and product quality of the corn harvester. The main contents of this paper are as follows: (1) on the basis of consulting a large number of literatures and in-depth investigation, the development trends, key technologies and research methods of corn harvester at home and abroad are analyzed. And deeply understand the layout problems and the development of virtual design technology at home and abroad, finally determine the research content and technical route of this paper. (2) according to the domestic and foreign market self-propelled corn harvester models, and combined with the relevant design books, literature, Based on the standard data, the structure of the self-propelled corn harvester is analyzed, the types of key components and systems, the characteristics and the influencing factors of operation performance are summarized, and the dynamic calculation method and power transfer route of the whole machine are given. At the same time, the layout type and main structural design parameters of the self-walking corn harvester are analyzed, which provides the design basis for the overall design of the self-walking corn harvester. (3) according to the structural characteristics and research requirements of the self-walking corn harvester, The longitudinal dynamic model and the manipulating stability dynamic model of the self-propelled corn harvester were constructed. At the same time, the position of the centroid of the self-walking corn harvester was analyzed, and the calculation method of the property and stability was used to analyze the performance of the whole machine. It also provides the theoretical basis for the optimization of the overall structure layout of the self-propelled corn harvester. (4) based on the analysis of the layout type of the self-propelled corn harvester, the geometric mechanism of the key components and the performance of the whole machine, In this paper, the principle and method of establishing a mathematical optimization model for the structural 3D layout design of a self-propelled corn harvester are studied, and the objective function of the structural layout of the whole machine is established by using the multi-objective method. Genetic algorithm is used to solve the structural layout optimization problem of self-propelled corn harvester. (5) based on VC Prop / E and virtual reality software EON, the overall structure layout design and virtual verification system of self-walking corn harvester are built. This paper studies the method of interactive operation of parts in virtual environment, so as to realize the parameterized design of the system, the optimization of the overall structure layout and the adjustment of the scheme in the virtual reality environment, and so on. It provides a rapid, intelligent and parameterized design platform for the overall design of the self-propelled corn harvester, thus shortens the product development time, saves the cost and improves the product quality.
【學(xué)位授予單位】:中國(guó)農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:S225.51
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