基于DEM的高频振网筛多参数优化

利用离散单元法（Discrete element method，DEM）对球形颗粒群以及非球形颗粒群的筛分过程进行了仿真并开展了实验研究，结果表明球形和非球形颗粒的仿真与实验中筛分效率的变化是一致的，但非球形颗粒的仿真结果与实验结果更接近。正交设计多组模拟试验，分析了各振动参数（振动频率、振幅以及筛面倾角）对颗粒分布曲线、筛分效率以及物料平均运输速度的影响规律。对正交试验表中的数据进行多元非线性拟合，得到筛分效率与振动参数间的关系式；并在此关系式的基础上，对振动参数进行优化设计，得到了最优振动参数且在仿真中得到了验证。研究内容不但为高频振网筛振动参数的设计提供了理论依据，而且为研究高频振动系统的筛分机理提供了实验和仿真数据支持。 

Multi-parameter optimization of high-frequency vibrating screen based on DEM

The screening efficiency and average transport speed of materials are important indicators for measuring the performance of screening machinery. In recent years, few breakthroughs have been made in traditional screening machinery. As high-efficiency vibration machinery, high-frequency vibrating screens have become widely used in recent years, but the operational methods of high-frequency vibrating mesh screens are relatively unique: the screen box is fixed and the screen is vibrated at a high frequency. Despite its wide use, there are relatively few studies about the materials movement law and screening characteristics of high-frequency vibrating screen. In this study, a discrete element method (DEM) was used in a simulation of the screening process of the spherical and nonspherical particle groups, and an experimental study was also conducted. The results show that changes in the screening efficiency in the simulation of spherical and nonspherical particles are consistent with those observed experimentally, but the simulation results for the nonspherical particles were closer to those obtained in the experiments. Orthogonal designs and multiple sets of simulation tests were conducted to analyze the influence of each vibration parameter (vibration frequency, amplitude and mesh inclination) on the particle distribution curve, screening efficiency, and average transport speed of the materials. Multivariate nonlinear fitting was performed on the data using the orthogonal test table, and the relationship between the screening efficiency and the vibration parameters was obtained. Based on this relationship, the optimal vibration parameters were obtained and verified in the simulation. The results obtained in this research provide a theoretical basis for the design of the vibration parameters of the high-frequency vibrating screen, and the experimental and simulation data provide support for the investigation of the screening mechanism of the high-frequency vibration system.