基于离散元法的颗粒压实特性研究  

Study on Compaction Characteristics of Particle Based on Discrete Element Method

作　　者：陈超云[1] 文慧卿 梁艳争[1] CHEN Chao-yun;WEN Hui-qing;LIANG Yan-zheng(Shanghai Institute of Measurement and Testing Technology,Shanghai 201203,China)

机构地区：[1]上海市计量测试技术研究院,上海201203

出　　处：《计量学报》2023年第6期917-922,共6页Acta Metrologica Sinica

摘　　要：颗粒压实致密化过程中,对颗粒物理特性和动态响应的关系,缺乏数学模型对力学行为进行表征。基于离散元法(DEM)建立了振动、旋转2个模型,对颗粒压实致密机制进行描述。为便于观察分析颗粒运动过程以及填充效果的变化,将颗粒的实际尺寸进行放大,设计骰子在圆柱形容器内的振动和变速旋转实验,探究颗粒压实的动力学特性。研究结果表明:在振幅为15 mm,振动频率为1~5 Hz激励下,颗粒会长时间停留在半有序排列状态,只有随时间推移,缓慢降低振幅至10 mm,振动频率至3 Hz时,才能达到完全有序排列状态。变速旋转的加速度大于0.5g时,无需加以干预,颗粒就能达到有序排列状态。In order to solve the particle pressure of the particle pressure,the relationship between the physical characteristics and dynamic response of the particles and the lack of mathematical models are characterized by mechanical behavior.For the relationship between the physical properties and dynamic response of particles during compaction and densification,there is a lack of mathematical models to characterize the mechanical behavior.Based on the discrete element method(DEM),two models of vibration and rotation are established to describe the density mechanism of particle pressure.In order to facilitate the analysis of the changes in the process of particles and the filling effect,the actual size of the particles is magnified,and the vibration and transmission rotation experiments of the dice in the cylindrical describer are designed to explore the dynamic characteristics of the compact particles.The research results show that:with the amplitude of 15 mm and the frequency of vibration is 1~5 Hz,the particles will stay in the semi orderly arrangement state for a long time.Only when the amplitude is reduced to 10mm at a slow time,and the frequency to 3 Hz,the complete orderly arrangement state can be achieved.When the acceleration of the transmission rotation is greater than 0.5 g,the particles can reach an orderly arrangement state without intervention.

关 键 词：计量学 压实密度 颗粒致密化 离散元法 仿真 振动 变速旋转 

分 类 号：TB933[一般工业技术—计量学]