基于堆积试验的壤土离散元参数的标定  

Parameters calibration of loam soil for discrete element simulation based on the repose angle of particle heap

作　　者：贺一鸣[1,2] 向伟 吴明亮[1,2,3] 全伟 陈超鹏[1,2] HE Yiming;XIANG Wei;WU Mingliang;QUAN Wei;CHEN Chaopeng(College of Engineering,Hunan Agricultural University,Changsha,Hunan 410128,China;Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China,Changsha,Hunan 410128,China;Hunan Province Modern Agricultural Equipment Engineering Technology Research Center,Changsha,Hunan 410128,China)

机构地区：[1]湖南农业大学工学院,湖南长沙410128 [2]南方粮油作物协同创新中心,湖南长沙410128 [3]湖南省现代农业装备工程技术研究中心,湖南长沙410128

出　　处：《湖南农业大学学报（自然科学版）》2018年第2期216-220,共5页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：湖南省政府重大专项(湘府阅[2014]35号);湖南省科学技术厅项目(2016NK2015;2017NK2131)

摘　　要：为获取南方地区黏弹性壤土颗粒离散元接触模型的本征物理参数和接触力学参数,建立其用于离散元仿真的接触模型。以试验测定的堆积角为40.95°的壤土为研究对象,选取Hertz–Mindlin with JKR接触模型,通过实测试验获取壤土的本征物理参数值;借助GEMM数据库推荐的土壤接触力学参数初选范围,通过最陡爬坡试验得到接触力学参数值的最优值区间。利用Design–Expert软件对最优值区间的接触力学参数进行4因素3水平二次正交旋转组合试验,获取堆积角回归模型,以实测土壤堆积角40.95°为目标,对回归模型进行接触力学参数寻优,得到接触力学参数的最优组合为:JKR表面能13.05 J/m2,恢复系数0.5,动摩擦因数0.15,静摩擦因数1.06,该最优组合参数仿真堆积角均值为41.07°,与实测堆积角误差为0.3%。A contact model for discrete element simulation was established to obtain the physical parameters and contact mechanical parameters of viscoelasticity loam soil particlesin southern region.Take the loam soil which test measured soil repose angel 40.95°as study object,chosen Hertz–Mindlin with JKR as contact model,the loam soil physical parameters was obtained by experiment.The steepest ascent test was used to obtain the optimum contact mechanics parameters by means of soil contact mechanic parameters primary select range in GEMM database.Design–expert software was used to carry out 4 factor 3 horizontal quadrature rotation combination test to obtain repose angel regression model.The variance analysis result showed that the optimization combination parameters as follow:JKR surface energy was 13.05 J/m2,recovery coefficient was 0.5,rolling friction coefficient was 0.15,static friction coefficient was 1.06 when the actual measurement repose angle was selected as target of 40.95°.The simulated mean repose angle was 41.07°by using best combination parameters.The repose angle value error was 0.3%compared with actual measurement value.

关 键 词：壤土 堆积角 离散元法 参数标定 接触模型 

分 类 号：S152.9[农业科学—土壤学]