本文選題：散體物料 + 離散元法�。� 參考：《湘潭大學(xué)》2015年碩士論文

【摘要】：散體物料是由大量離散的顆粒組成的一個(gè)復(fù)雜系統(tǒng),人們的日常生活中隨處可見,如糧食、藥片、食鹽、味精、沙子、石子等。散體物料的混合過程是應(yīng)用散體物料的一個(gè)重要操作單元,在工業(yè)生產(chǎn)操作中處于核心工段。研究散體物料混合,提高散體物料混合的效率以及物料混合后的均勻性等是研究者們一直關(guān)注的問題。以往,大多采用實(shí)驗(yàn)的方法進(jìn)行研究,而缺乏對(duì)物料顆粒微觀運(yùn)動(dòng)特性的了解,對(duì)物料的混合機(jī)理尚不十分清楚。隨著科學(xué)技術(shù)和計(jì)算機(jī)技術(shù)的發(fā)展,數(shù)值計(jì)算方法得到快速而廣泛的應(yīng)用,其中基于離散顆粒介質(zhì)動(dòng)力學(xué)的離散單元法(Discrete Element Method,DEM)在不斷的發(fā)展和完善,在模擬這類散體顆粒運(yùn)動(dòng)特性方面的問題有著顯著的優(yōu)勢(shì)。本文以沙子和石子為研究載體,通過實(shí)驗(yàn)研究和數(shù)值仿真的方法對(duì)沙子和石頭在對(duì)在回轉(zhuǎn)筒內(nèi)的混合情況進(jìn)行分析;研究了回轉(zhuǎn)速度、物料填充率、物料投放次序以及筒體結(jié)構(gòu)對(duì)物料混合均勻程度的影響,并研究了參數(shù)的優(yōu)化組合。具體內(nèi)容如下:(1)介紹了散體物料以及其研究現(xiàn)狀、散體物料混合過程研究的主要內(nèi)容及其研究方法;(2)通過對(duì)沙子與石子進(jìn)行密度測(cè)量實(shí)驗(yàn)、回彈實(shí)驗(yàn)以及直剪實(shí)驗(yàn)等,測(cè)定了密度、恢復(fù)系數(shù)、摩擦系數(shù)等參數(shù);然后對(duì)其進(jìn)行V型箱和L型箱實(shí)驗(yàn),觀察顆粒的流動(dòng)堆積過程;建立對(duì)應(yīng)的離散元仿真模型,通過對(duì)比實(shí)驗(yàn)和模擬仿真結(jié)果,校準(zhǔn)離散元模型中顆粒的接觸參數(shù);(3)設(shè)計(jì)了水平回轉(zhuǎn)筒物料混合實(shí)驗(yàn)臺(tái),采用重復(fù)停機(jī)取樣進(jìn)行實(shí)驗(yàn),設(shè)計(jì)了多個(gè)運(yùn)動(dòng)工況,研究回轉(zhuǎn)筒轉(zhuǎn)速、物料填充率、物料投放次序以及筒體結(jié)構(gòu)對(duì)物料混合的影響;(4)利用離散元模擬以及正交試驗(yàn)設(shè)計(jì),選取混合時(shí)間和混合后接觸顆粒數(shù)率兩個(gè)試驗(yàn)指標(biāo),研究分析了物料填充率、轉(zhuǎn)速、回轉(zhuǎn)筒的直徑和筒體結(jié)構(gòu)對(duì)物料混合的影響。
[Abstract]:Bulk material is a complex system composed of a large number of discrete particles, which is widely used in people's daily life, such as grain, tablets, salt, monosodium glutamate, sand, stone and so on. The mixing process of bulk materials is an important operation unit for the application of bulk materials, which is in the core stage of industrial production. To study the mixing of bulk materials and improve the efficiency of mixing and the uniformity of materials after mixing are the problems that researchers have been paying close attention to all the time. In the past, most of the experiments were carried out, but the microscopic motion characteristics of the particles were not well understood, and the mixing mechanism of the materials was not very clear. With the development of science and technology and computer technology, numerical methods have been applied rapidly and widely. Among them, discrete Element method based on discrete particle dynamics has been continuously developed and improved. There are significant advantages in simulating the motion characteristics of such granular particles. In this paper, the mixing of sand and stone in the rotary cylinder is analyzed by means of experimental research and numerical simulation, and the velocity of rotation and the filling rate of materials are studied. The effects of material delivery order and cylinder structure on the mixing uniformity of materials are studied, and the optimal combination of parameters is studied. The contents are as follows: (1) introducing the bulk materials and their research status, the main contents and research methods of the mixing process of the bulk materials, the density measurement experiment, the springback experiment and the direct shear experiment on sand and stone, etc. The density, recovery coefficient, friction coefficient and other parameters are measured, and then the V and L box experiments are carried out to observe the flow accumulation process of particles. The corresponding discrete element simulation model is established, and the simulation results are compared with those of the simulation results. Calibrating the contact parameters of particles in the discrete element model, a horizontal rotary cylinder material mixing test bench was designed. Repeated stop sampling was used to carry out the experiment, and several moving conditions were designed to study the rotating speed of the rotary cylinder and the filling rate of the material. Using discrete element simulation and orthogonal test design, two test indexes, mixing time and the number of contact particles after mixing, are selected to study and analyze the filling rate and rotational speed of materials. The influence of the diameter of the rotary cylinder and the structure of the cylinder on the material mixing.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ027.1

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本文編號(hào)：1902088