胶园植保硫磺粉颗粒离散元模型参数标定  

Parameter Calibration of Discrete Element Model of Sulfur Powder Particles for Rubber Plantation Protection

作　　者：李承明 张斌 夏雨阳[1] 王勇 肖骁 付威 LI Chengming;ZHANG Bin;XIA Yuyang;WANG Yong;XIAO Xiao;FU Wei(School of Mechanical and Electrical Engineering,Hainan University,Haikou 570228,China;School of Information and Communication Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学机电工程学院,海南海口570228 [2]海南大学信息与通信工程学院,海南海口570228

出　　处：《江西农业大学学报》2022年第3期605-613,共9页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(32160424);海南省重点研发项目(ZDYF2020042)。

摘　　要：【目的】白粉病是影响橡胶树天然橡胶产量的重要病害,常使用硫磺粉进行防治。为确定胶园植保过程中喷施硫磺粉颗粒的离散元仿真参数,对硫磺粉粉体的离散元参数进行标定。【方法】通过BT-1000型粉体综合特性测试仪进行物理试验获取硫磺粉休止角,测量多次取平均值。以休止角为响应值,应用Plackett-Burman试验筛选出对休止角影响显著的3个参数,进一步基于最陡爬坡试验确定显著性参数的最优取值区间,并通过BoxBehnken试验建立并优化休止角与显著性参数的二阶回归模型,以物理试验休止角为目标值,对显著性参数寻优得到最佳组合。【结果】经过物理试验测得的硫磺粉休止角大小为48.56°。通过Plackett-Burman试验筛选出的3个影响显著参数为:硫磺粉-硫磺粉滚动摩擦系数、硫磺粉-不锈钢滚动摩擦系数和JKR表面能,其余影响不显著的参数取值:硫磺粉-硫磺粉恢复系数为0.2、硫磺粉-硫磺粉静摩擦系数为0.6、硫磺粉-不锈钢恢复系数为0.2、硫磺粉-不锈钢静摩擦系数为0.5。最陡爬坡试验确定的最优取值区间:硫磺粉-硫磺粉滚动摩擦系数为0.1~0.2、硫磺粉-不锈钢滚动摩擦系数为0.15~0.35、JKR表面能为0.02~0.04 J/m^(2)。寻优后得到的显著性参数组合:硫磺粉-硫磺粉滚动摩擦系数为0.17、硫磺粉-不锈钢滚动摩擦系数为0.34、JKR表面能为0.03 J/m^(2)。将上述参数输入仿真软件进行验证,得到仿真休止角平均值为47.95°,与物理试验所得实际休止角的相对误差为1.26%。【结论】标定的硫磺粉离散元参数可靠,可为硫磺粉颗粒与植保喷粉装置间相互耦合仿真提供参数支持,为植保喷粉机的设计仿真与优化提供依据。[Objective]Powdery mildew is a disease that affects the production of natural rubber.Sulfur powder is often used for its prevention and treatment.This study aims to determine the discrete element simulation parameters of the sulfur powder particles sprayed in the process of plant protection in the rubber plantation,the discrete element parameters of the sulfur powder were calibrated.[Methods]The repose angle of sulfur powder was obtained by physical tests with BT-1000 powder comprehensive characteristic tester,andthe average value was measured.Taking the repose angle as the response value,three parameters with significant influence on the repose angle were selected by Plackett-Burman test,and the optimal value range of significance parameters was further determined based on the steepest climbing test.The second-order regression model of repose angle and significance parameters was established and optimized by Box-Behnken test,and the repose angle of physical test was taken as the target value to optimize the significance parameters to get the optimal combination.[Results]The repose angle of sulfur powder measured by physical tests was 48.56°.The three significant parameters selected by Plackett-Burman test were sulfur powder-sulfur powder rolling friction coefficient,sulfur powder-stainless steel rolling friction coefficient and JKR surface energy.The other parameters with insignificant effect were:sulfur powder-sulfur powder restoration coefficient was 0.2,sulfur powder-sulfur powder static friction coefficient was 0.6,sulfur powder-stainless steel restoration coefficient was 0.2,sulfur powder-stainless steel static friction coefficient was 0.5.The optimal range determined by the steepest climbing test were as follows:sulfur powder-sulfur powder rolling friction coefficient was 0.1-0.2,sulfur powder-stainless steel rolling friction coefficient was 0.15-0.35,JKR surface energy was 0.02-0.04 J/m^(2).The significant parameter combinations obtained after optimization were as follows:sulfur powder-sulfur powder roll

关 键 词：胶园植保 硫磺粉 离散元 休止角 参数标定 

分 类 号：S224[农业科学—农业机械化工程] S492[农业科学—农业工程]