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Research on DEM-Simulation in Vibration Screening Process

Author: ZhangYong
Tutor: LiDongSheng
School: Northeastern University
Course: Mechanical and Electronic Engineering
Keywords: Screen DEM Simulation Experiment
CLC: TD921.3
Type: Master's thesis
Year: 2010
Downloads: 138
Quote: 0
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Abstract


Screening operation is an important production processes in the metallurgy, coal, chemical, pharmaceutical and many other industrial sectors, shoulder grading, dehydration, and other important tasks. At the present time, research on screening operation is developing healthy. This article is the screening process parameters on the impact of screening efficiency of problem. This article introduced "Discrete Element Method(shorted DEM)" used in screening process research, and established discrete element unit models for screening process research. This article achieved the motion simulation of screening process in EDEM, and analysis the state of motion of screen materials.Firstly, the screening efficiency is an important indicator of evaluate the screening results. There are many factors affect the screening efficiency, this article selects the material layer, amplitude, frequency of three screening process parameters to analyze the impact of the screening efficiency. Using basic principle of DEM and Hertz contact theory, this article introduced the judgment methods of material particles contact with each other and particles contact with boundary. Based on an example of vertical vibrating screen which consists of vibrating bench and standard screen, we made dynamic analysis of the vibrating screen and calculated its natural frequency to design the screening process parameters in the simulation of EDEM.Secondly, through the simulation of EDEM, we gained the screening efficiency and the motion state of the materials on the screen surface. Analyze the influence of motion state to the screening efficiency. Using the screening efficiency of simulation and its screening process parameters establish and train a BP network, and use the network optimal the screening process parameters.Finally, design a practical screening experiment, based on the results of the experiment, we calculate the screening efficiency. Through the comparison of experiment and simulation, we can verify the screening efficiency of simulation is correct, and verify the performance of BP network to meet the requirements, and then verify the optimized of the screening process parameters is also correct.

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CLC: > Industrial Technology > Mining Engineering > Beneficiation > Beneficiation processes and methods > Before the election, to prepare job > Screening
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