基于EDEM的生猪粥料离散元模型参数标定  

Calibration of Discrete Element Model Parameters of Pig Porridge Based on EDEM

作　　者：邬备 钱怀源 黄天赐 李卓[1] 刘大为[1,2] 谢方平 WU Bei;QIAN Huaiyuan;HUANG Tianci;LI Zhuo;LIU Dawei;XIE Fangping(College of Mechanical and Electrical Engineering,Hunan Agricultural University,Changsha 410128,China;Hunan Provincial Key Laboratory of Intelligent Agricultural Machinery Equipment,Changsha 410128,China)

机构地区：[1]湖南农业大学机电工程学院,湖南长沙410128 [2]智能农机装备湖南省重点实验室,湖南长沙410128

出　　处：《江西农业大学学报》2023年第3期726-736,共11页Acta Agriculturae Universitatis Jiangxiensis

基　　金：湖南省自然科学基金项目(2021JJ30333)。

摘　　要：[目的]建立粥状饲料的离散元模型有助于开发和优化粥料处理设备,获取生猪粥料的离散元仿真模型参数。[方法]通过配制水料比为1.5∶1~2.0∶1的粥状饲料,测定不同水料比粥料的休止角,建立水料比与休止角的回归方程。以水料比1.8∶1的生猪粥料为研究对象,利用EDEM离散元软件,选取“Hertz-Mindlin with JKR”作为接触模型,采用圆筒提升法进行粥料休止角仿真模拟。以饲料颗粒泊松比、剪切模量、颗粒密度,饲料间碰撞恢复系数、静摩擦系数、滚动摩擦系数,饲料-不锈钢间碰撞恢复系数、静摩擦系数、滚动摩擦系数以及JKR(Johnso-Kendall-Roberts)表面能共10个参数作为试验因素,以粥料休止角为评价指标,采用筛选试验设计(Plackett-Burman design)对模型参数进行筛选,采用最陡爬坡试验确定显著性参数的最优值区间,采用响应曲面试验设计(Box-Behnken design)建立休止角与显著参数的二阶回归模型,通过回归模型计算最优显著参数,最后利用最佳参数组合进行仿真休止角验证试验,并与实际试验进行对比。[结果]筛选试验结果表明,对休止角有显著性影响的参数为饲料间静摩擦系数、饲料间滚动摩擦系数和JKR表面能。响应曲面试验得到的显著参数的最优组合为:饲料间滚动摩擦系数为0.3、饲料间静摩擦系数为0.08、JKR表面能为0.008 93 J/m2。验证试验结果表明,仿真试验饲料休止角和实际试验休止角的相对误差为2.45%,且不同方向堆形相似性较高。[结论]基于Hertz-Mindlin with JKR模型标定的离散元参数准确,能较好地模拟生猪粥料的物料性状,该模型可为生猪粥状饲料处理设备的研发和仿真优化提供理论基础。[Objective]Since discrete element model for porridge feeds is essential for developing and optimizing porridge handling equipment,this study aims to obtain the discrete element simulation model parameters of pig porridge.[Method]The repose angle of porridge with different water-to-material ratios was measured and the regression equation between the water-to-material ratio and repose angle was established in this study.The repose angle of porridge with a water-to-material ratio of 1.8∶1 was simulated by using the cylinder lifting method and the contact model of“Hertz-Mindlin with JKR”in software(EDEM).A total of 10 parameters(i.e.the Poisson’s ratio,shear modulus and density of feed particle,the collision recovery coefficient,static friction coefficient and rolling friction coefficient between feed particle,the collision recovery coefficient,static friction coefficient and rolling friction coefficient between feed and steel,the JKR surface energy)were used as the test factors,and the repose angle was used as the evaluation index.Firstly,the model parameters were screened by Plackett-Burman design of experiments,and the optimum range of the significant parameters value was determined by the steepest ascent search experiments.Secondly,a secondary regression model of the repose angle was developed by using the Box-Behnken design of Experiments,which determined the optimal parameters.Finally,a verification test was conducted and compared with the actual test.[Result]The results showed that the parameters which exerted a significant effect on the repose angle were the feed-feed static friction coefficient,the feed-feed rolling friction coefficient and the JKR surface energy.The optimized significant parameter combinations were as follows:the feed-feed static friction coefficient was 0.3,the feed-feed rolling friction coefficient was 0.08 and the JKR surface energy was 0.00893 J/m2.The results of verification tests showed that the relative error between the simulated repose angle and the actual repose angle is 2

关 键 词：生猪粥料 离散元 模型参数 EDEM 休止角 

分 类 号：S22[农业科学—农业机械化工程] S817.12[农业科学—农业工程]