基于EDEM方法的稳定土搅拌器搅拌过程模拟

发布时间：2018-01-19 18:27

本文关键词： 搅拌器稳定土搅拌机理 EDEM　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：搅拌器对稳定土的拌合是影响稳定土产品质量的重要环节,分析稳定土的搅拌过程既有利于稳定土搅拌理论的研究,也方便评价搅拌器搅拌性能的优劣。基于稳定土具有散体介质的性质,本文采用EDEM离散元分析软件来模拟稳定土的搅拌过程,具体包:利用经验公式来确定各设计参数之间的关系,以搅拌器表面积最小为目标函数优化得到了搅拌器的最佳叶片半径、长宽比、搅拌轴中心距,建立了生产率为800 t/h的连续式搅拌器三维模型,并且利用Ansys对搅拌装置进行了静力学分析和模态分析以保证所设计产品的可靠性;基于相似理论的方法设计了适合用EDEM软件来分析的模型。根据稳定土的物理性质和级配组成设置了详细的材料参数与质量分数,在模拟初期采用Hertz-Minlin接触模型,后期采用Hertz-Minlin with JKR接触模型,分别模拟了间歇式和连续式搅拌器的搅拌过程,得到了混合颗粒的速度、质量分布特征,提出了多种估计最佳搅拌时间的方法。通过对连续式搅拌器搅拌过程的模拟,提出了用质量分数来评价混合料均匀性的方法,并且对稳定土产品的均匀性进行了验证。
[Abstract]:Mixing of stabilized soil by mixer is an important link that affects the quality of stabilized soil. The analysis of mixing process of stabilized soil is beneficial to the study of mixing theory of stabilized soil. It is also convenient to evaluate the agitator's agitation performance. Based on the properties of the stabilized soil with granular medium, the EDEM discrete element analysis software is used to simulate the mixing process of the stabilized soil. Specific package: the empirical formula is used to determine the relationship between the design parameters, and the optimum blade radius, aspect ratio and center distance of the agitator are obtained by using the minimum surface area of the stirrer as the objective function. The 3D model of the continuous stirrer with productivity of 800t / h is established, and the statics analysis and modal analysis of the mixer are carried out by Ansys to ensure the reliability of the designed product. Based on the method of similarity theory, a model suitable for analysis by EDEM software is designed. According to the physical properties and gradation composition of stabilized soil, detailed material parameters and mass fraction are set up. Hertz-Minlin contact model was used at the beginning of the simulation and Hertz-Minlin with JKR contact model was used in the later stage. The mixing process of batch agitator and continuous agitator was simulated, and the velocity and mass distribution characteristics of mixed particles were obtained. By simulating the mixing process of continuous agitator, the method of evaluating mixture uniformity by mass fraction is put forward. And the homogeneity of the stabilized soil product is verified.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U415.5

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