基于静态和动态休止角的钛白粉离散元仿真参数标定  

Discrete element parameters calibration of titanium dioxide based on static and dynamic repose angles

作　　者：吴震 王利强 徐立敏 高伟俊 WU Zhen;WANG Liqiang;XU Limin;GAO Wejun(School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University,Wuxi 214122,China;Jiangsu Innovative Packaging Technology Co.,Ltd.,Yangzhou 225600,China)

机构地区：[1]江南大学机械工程学院,江苏无锡214122 [2]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122 [3]江苏创新包装科技有限公司,江苏扬州225600

出　　处：《中国粉体技术》2023年第4期108-119,共12页China Powder Science and Technology

基　　金：中央高校基本科研业务费专项资金项目,编号:JUSRP21115;江苏省食品先进制造装备技术重点实验室自主资助基金项目,编号:FMZ201902。

摘　　要：粉体物料在进行离散元模拟前需要通过参数标定过程来获得精确的离散元仿真参数,现有的参数标定多以静态休止角作为单一的响应值,并不能充分体现粉体的真实性能。为了提高钛白粉离散元仿真参数的精度,选取钛白粉的静态休止角和动态休止角作为宏观响应指标,使用自制的测定装置测得钛白粉的静态和动态休止角的平均值;根据颗粒的尺寸相似原则和减小刚度原理对钛白粉颗粒的粒径和切变模量进行简化,并建立离散元仿真模型;通过单因素试验排除部分对休止角影响较小的离散元仿真参数;应用Box-Behnken试验分别建立静态和动态休止角的二阶回归方程,以实际测定的休止角为目标值对2个回归方程进行寻优求解,获得最优的离散元仿真参数组合;对离散元仿真参数进行实验验证,实现对钛白粉离散元仿真参数标定。结果表明:当钛白粉-钛白粉静摩擦系数为0.51,滚动摩擦系数为0.29,钛白粉-不锈钢静摩擦系数为0.62,滚动摩擦系数为0.17时,钛白粉的离散元仿真参数值组合最优;仿真得到的静态和动态休止角分别为40.4°、66.2°,与实际测定值的相对误差分别为1.22%、1.07%。Before the discrete element simulation of powder materials,it is necessary to obtain accurate discrete element simula-tion parameters through the parameter calibration process.The existing parameter calibration mostly takes the static angle of repose as a single response value,which can not fully reflect the real performance of powder.In order to improve the precision of discrete element simulation parameters of titanium dioxide,static angle of repose and dynamic angle of titanium dioxide were selected as macro-response indexes.Mean values of static and dynamic repose angles of titanium dioxide were measured by self-made measuring devices.Particle size and cutting modulus of titanium dioxide were simplified according to the principle of particle size similarity and stiffness reduction,and the discrete element simulation model was established.The discrete element simulation parameters which have litle effect on the angle of repose were excluded by single factor test.Box-Behnken test was used to establish the second order regression equations of static and dynamic angle of repose,and the optimal discrete element simulation parameter combination was obtained by taking the actual measured angle of repose as the target value.The discrete element simulation parameters were verified by experiments,and the calibration of titanium dioxide simulation parameters was realized.The results show that when the static friction coefficient of titanium dioxide-titanium dioxide is 0.51,rolling friction coefficient is 0.29,static friction coefficient of titanium dioxide-stainless steel is 0.62,and rolling friction coefficient is 0.17,the discrete element simulation parameter combination of titanium dioxide is the best.The static and dynamic repose angles obtained by simulation are 40.4 and 66.2°respectively,and the relative errors with measured values are 1.22%and 1.07%,respectively.

关 键 词：钛白粉 颗粒简化 静态休止角 动态休止角 离散单元法 参数标定 

分 类 号：TB44[一般工业技术]