本文選題：肥料物理特性　切入點(diǎn)：變量施肥機(jī)　出處：《石河子大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：我國(guó)作物施肥目前大多采用均一化施肥方式,肥料利用率偏低,氮、磷、鉀等微量元素使用量比例失調(diào),大量流失的化肥造成了資源的極大浪費(fèi)的同時(shí)還對(duì)環(huán)境造成了極大的污染。根據(jù)區(qū)域、土壤特征、土壤中各種養(yǎng)分的分布、作物特性和產(chǎn)量,按照農(nóng)藝中的要求采用精準(zhǔn)變量施肥機(jī)械進(jìn)按需求施肥,使農(nóng)戶(hù)獲得最大化的經(jīng)濟(jì)效益和環(huán)保效益,研究用于基肥、種肥的棉花變量施肥技術(shù)及裝備具有廣泛的應(yīng)用前景和重要的現(xiàn)實(shí)意義。本文在研究國(guó)內(nèi)外變量施肥技術(shù)現(xiàn)狀的基礎(chǔ)上,依據(jù)離散元法分析計(jì)算的要求,通過(guò)對(duì)肥料顆粒的物理力學(xué)性能的測(cè)試分析,獲得肥料顆粒的三維尺寸、粒密度,含水率、肥料顆粒的剛度系數(shù)、碰撞恢復(fù)系數(shù)等參數(shù),并給出了其影響因素間的關(guān)系。闡述離散元法求解的基本原理,利用開(kāi)發(fā)的基于離散元法的集成分析設(shè)計(jì)軟件,對(duì)外槽輪式排肥器的工作過(guò)程進(jìn)行仿真分析,通過(guò)對(duì)剛度系數(shù)、摩擦系數(shù)對(duì)排肥器工作過(guò)程和排肥能力的仿真,證明了離散元法分析肥料顆粒與農(nóng)業(yè)裝備相關(guān)機(jī)械部件接觸作用的可行性、所建立的散粒物料與相關(guān)機(jī)械部件的離散元法分析模型和開(kāi)發(fā)的集成分析設(shè)計(jì)軟件的可用性及離散元法分析計(jì)算參數(shù)選取的合理性,為復(fù)雜結(jié)構(gòu)和運(yùn)動(dòng)方式機(jī)械部件的離散元法仿真分析奠定了基礎(chǔ)。
[Abstract]:At present, most of the crop fertilization in China adopts the uniform fertilization method, the fertilizer utilization rate is low, and the use ratio of trace elements such as nitrogen, phosphorus, potassium and so on is out of balance. The mass loss of chemical fertilizers not only causes great waste of resources, but also causes great pollution to the environment. According to region, soil characteristics, distribution of nutrients in the soil, crop characteristics and yield, According to the requirements of agronomy, precision variable rate fertilization machinery is used to apply fertilizer according to demand, so as to maximize the economic and environmental benefits of farmers, so as to study the application of fertilizer to base fertilizer. The technology and equipment of variable-rate fertilization of cotton seed fertilizer have a wide application prospect and important practical significance. Based on the research of the present situation of variable-rate fertilization technology at home and abroad, the requirements of analysis and calculation based on discrete element method are presented in this paper. By testing and analyzing the physical and mechanical properties of fertilizer particles, the parameters such as three-dimensional size, particle density, moisture content, stiffness coefficient of fertilizer particles, collision recovery coefficient and so on are obtained. The basic principle of discrete element method (DEM) is expounded, and the working process of external grooves wheeled fertiliser is simulated and analyzed by using the integrated analysis and design software based on discrete element method (DEM), and the stiffness coefficient is analyzed. The simulation of friction coefficient on the working process and capacity of fertiliser proves that the discrete element method is feasible to analyze the contact effect between fertilizer particles and the mechanical components related to agricultural equipment. The analysis model of discrete element method and the availability of the integrated analysis and design software developed by the discrete element method and the reasonableness of the selection of the calculation parameters of the discrete element method are established. It lays a foundation for the simulation and analysis of complex structures and moving mechanical parts by discrete element method.
【學(xué)位授予單位】：石河子大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：S224.2

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本文編號(hào)：1600658