基于离散元的三七种子仿真参数标定与试验  

Calibration and Experiment of Simulation Parameters for Panax notoginseng Seeds Based on DEM

作　　者：于庆旭 刘燕 陈小兵 孙凯[2] 赖庆辉[2] YU Qingxu;LIU Yan;CHEN Xiaobing;SUN Kai;LAI Qinghui(Nanjing Research Institute for Agriculture Mechanization,Ministry of Agriculture and Rural Affairs,Nanjing 210014,China;Faculty of Agriculture and Food,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]农业农村部南京农业机械化研究所,南京210014 [2]昆明理工大学农业与食品学院,昆明650500

出　　处：《农业机械学报》2020年第2期123-132,共10页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51305187、51975265);国家重点研发计划项目(2017YFD0700600-2017YFD0700604);云南省重大科技专项(2016ZF001、2017ZF001、2018ZC001-3、2018ZC001-4、2018ZC001-5);云南省教育厅项目(2016ZZX048);云南省高校工程研究中心建设计划项目;云南省科技厅创新团队计划项目

摘　　要：采用逆向工程技术,基于粘结颗粒模型,在EDEM软件中建立了三七种子离散元模型;结合台架试验和仿真试验,在EDEM软件中标定接触参数,通过碰撞弹跳试验、斜面滑移试验和斜面滚动试验,得到三七种子与ABS塑料之间碰撞恢复系数、静摩擦因数和滚动摩擦因数分别为0.611、0.473和0.067;基于二次回归正交旋转组合试验的响应面优化方法,确定EDEM仿真试验中三七种子之间最佳的接触参数,通过堆积试验,得到三七种子之间碰撞恢复系数、静摩擦因数和滚动摩擦因数分别为0.492、0.202和0.083;选取三七精密排种器进行验证试验,以排种器充种合格率、漏播率和重播率作为试验指标,在不同排种轮转速的试验条件下,分别对比试验指标的实测值和仿真值,得到试验指标的相对误差均小于5.0%,表明该三七种子离散元模型和接触参数可用于离散元仿真试验。Panax notoginseng is a kind of precious medicine and mainly grown in Yunnan Province.Aiming to study the mechanical filling performance and optimize the cell hole size of precise Panax notoginseng seed metering device based on EDEM software.It is necessary to accurately establish the seed discrete element model of Panax notoginseng and define the contact parameters of simulation model in EDEM software.Reverse engineering technology was used.Based on bonded particle model,the seed discrete element model of Panax notoginseng was established in EDEM software.Combined with bench experiment and simulation experiment,the contact parameters were calibrated in EDEM software.The restitution coefficient between Panax notoginseng seed and ABS plastic was 0.611 by the impact bounce test method.The static friction coefficient between Panax notoginseng seed and ABS plastic was 0.473 by the inclined plane sliding test method.The rolling friction coefficient between Panax notoginseng seed and ABS plastic was 0.067 by the inclined plane rolling test method.Based on the response surface optimization of quadratic orthogonal rotating combination test method,the optimal contact parameters between the Panax notoginseng seeds in EDEM simulation experiment were determined.The restitution coefficient,static friction coefficient and rolling friction coefficient between Panax notoginseng seeds were 0.492,0.202 and 0.083 by stacking test method,respectively.The Wenshan Panax notoginseng seeds were chosen for seeding object.The precise Panax notoginseng seed metering device were selected for verification experiment.The qualified index,missing index and multiple index of seed filling were taken as the experiment indexes of seed metering device.Under the experiment conditions of different rotation speeds,the measured and simulated values of the experiment indexes were compared.The relative error of the experiment indexes was less than 5.0%.The results showed that the seed discrete element model of Panax notoginseng and contact parameters can b

关 键 词：三七种子 离散元法 参数标定 颗粒模型 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术] S223.2[自动化与计算机技术—计算机科学与技术]