振动特性对颗粒混合均匀性影响的EDEM模拟

摘要

By applying EDEM software in an airtight container under different shape of particles in the vibration state of mixing uniformity,the numerical simulation and analysis of the vibration amplitude and frequency influence on powder mixed uniformity standard deviation were done,and the orthogonal test design experiment and variance method was used to analyze the results.It is found that the standard deviation as the vibration time for all showed a decreasing change rule,after the 6 s standard deviation present decrease with the increase of vibration frequency of the change rule,after the 4 s standard deviation increases with the increase of vibration amplitude and present the change taw of vibration frequency calculated by orthogonal had the greatest influence on particle mixing uniformity,followed by the amplitude.The comprehensive measure is obtained that 90 Hz,2 mm,which can improve the maximum fission hybrid degre.Through dynamic analysis of the particle movement speed,verified the accuracy of the results of orthogona.%应用工程离散单元法(Engineering Discrete Element Method,EDEM)对密闭容器内不同外形颗粒在振动状态下的混合均匀度进行数值模拟,分析振动频率和振幅对粉体混合均匀度标准偏差的影响,并通过正交实验法和方差法对结果进行分析.结果发现:标准偏差随振动时间均表现出递减的变化规律,在6s之后标准偏差随振动频率的增加呈现减小的变化规律,在4s之后标准偏差随振幅的增加呈现增大的变化规律,通过正交计算得到振动频率对颗粒混合均匀性影响最大,其次是振幅,综合衡量采用90 Hz、2 mm能获得最佳混合度,通过动态分析颗粒的运动速度验证了正交结果的准确性.