油莎豆排种离散元仿真参数标定与试验  

Calibration and Analysis of Seeding Parameters of Cyperus esculentus Seeds Based on Discrete Element Simulation

作　　者：陈永 高晓勋 金鑫 马晓然 胡斌[4] 张秀丽[1] CHEN Yong;GAO Xiaoxun;JIN Xin;MA Xiaoran;HU Bin;ZHANG Xiuli(College of Mechanical and Electrical Engineering,Henan Agricultural University,Zhengzhou 450002,China;Science and Technology Innovation Center for Completed Set Equipment,Longmen Laboratory,Luoyang 471003,China;College of Agricultural Equipment Engineering,Henan University of Science and Technology,Luoyang 471003,China;College of Mechanical and Electronic Engineering,Shihezi University,Shihezi 832003,China)

机构地区：[1]河南农业大学机电工程学院,郑州450002 [2]龙门实验室成套装备科创中心,洛阳471003 [3]河南科技大学农业装备工程学院,洛阳471003 [4]石河子大学机械电气工程学院,石河子832003

出　　处：《农业机械学报》2023年第12期58-69,共12页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(52005167、52165036);河南省博士后科研项目(202102061);河南省科技攻关项目(232102111122);现代农业机械兵团重点实验室项目(BTNJ2021001);河南省重大科技专项(231100110200)。

摘　　要：油莎豆种球形状不规则,表面凹凸不平,国内油莎豆播种装置多数是基于大粒种球排种器进行改进,由于离散元模拟试验过程中缺乏准确的仿真参数,导致对排种器进行仿真优化分析时产生误差。针对此问题,本文测量油莎豆种子的本征参数和与排种装置间的接触参数,利用逆向工程技术构建油莎豆种子颗粒填充模型。依据方形壳体和圆筒的仿真堆积试验结果,采用Plackett-Burman试验筛选出对种群堆积角有显著影响的种间静摩擦因数和种间滚动摩擦因数,建立以这两种显著影响因子为自变量、种群堆积角为响应值的二元回归方程。用Matlab对方程组求解后得到标定后的种间静摩擦因数和种间滚动摩擦因数分别为0.246、0.083。为检验标定后参数的可靠性,在EDEM中进行仿真验证试验,结果显示方形壳体装置仿真和物理堆积角的误差为0.43%,圆筒装置仿真和物理堆积角的误差为0.55%。为进一步验证标定后参数的准确性,采用气力式精量排种器,并选取3个关键特征尺寸和堆积截面积占比率,待种群稳定后将仿真和物理试验做对比,最后得到进种口种群上边界最大凸点处与排种盘水平中心线距离H1、种群轮廓边界与透明观察窗左侧竖线的交点到排种盘水平中心线距离H2和堆积截面积占比率r等参数的相对误差均在8.33%以内。The shape of Cyperus esculentus seeds is irregular and the surface is uneven.Most of the domestic seed equipment of the seed ball is improved based on the large seed ball seed feeder.Due to the lack of accurate simulation parameters during the discrete element simulation experiment,this results in errors in the simulation and optimization analysis of the seed dispenser.To solve this problem,the intrinsic parameters and the contact parameters between seeds and seeding device were measured,and the seed particle filling model was constructed by reverse engineering technology.According to the results of simulation accumulation test of square shell and cylinder,Plackett-Burman test was used to screen out the interspecific static friction coefficient and interspecific rolling friction coefficient which had significant influence on population accumulation angle.A binary regression equation was established with these two significant influence factors as independent variables and population accumulation angle as response value.After solving the equations with Matlab,the calibrated interspecific static friction coefficient and interspecific rolling friction coefficient were 0.246 and 0.083,respectively.To verify the reliability of parameters after calibration,simulation verification test was carried out in EDEM,and the results showed that the error between simulation and physical accumulation angle of square shell device and physical accumulation angle of cylinder device was 0.43%,and the error between simulation and physical accumulation angle of cylinder device was 0.55%.To further verify the accuracy of parameters after calibration,the pneumatic precision seed disperser was used and the three key feature sizes and the ratio of stack cross-sectional area were selected.After Cyperus esculentus seeds was stabilized,the simulation and physical test were compared,finally,the relative errors of the parameters H,from the maximum convex point of the upper boundary of the population to the horizontal center line of the seed plat

关 键 词：油莎豆种子 接触参数 Plackett-Burman试验 离散元 标定 

分 类 号：S223.23[农业科学—农业机械化工程]