农机化研究2024，Vol.46Issue(1)：46-53,8.
基于休止角试验的颗粒钾肥离散元模型参数标定
Parameter Calibration of Discrete Element Model of Granular Potassium Fertilizer Based on Angle of Repose Test
摘要
Abstract
The triaxial size and quality of a kind of granular potash fertilizer were measured,the value range of discrete element simulation parameters was determined by referring to the literature.The angle of repose of potash fertilizer was ob-tained through the physical test of bottomless cylinder stacking.EDEM software was used to establish the simulation model of potash fertilizer.Through experimental design,the simulation results of angle of repose under different parameter com-binations are obtained.Through the Plackett-Burman function in Expert Design software,the significance of 8 key param-eters required for simulation was evaluated.It was found that the static friction coefficient of potash fertilizer and the roll-ing friction coefficient of potash fertilizer had a significant effect on the angle of repose.The value range of two parameters was further determined by the steepest climbing test,and the remaining six parameters were all taken as median values due to their litter significance.Based on the box-Behnken test results,a second-order regression model of angle of repose and significance parameters was established,and the model was optimized.Finally,the values of the parameters are de-termined as:Poisson ratio of potassium fertilizer is 0.25,shear modulus of potassium fertilizer is 7.3×107,recovery co-efficient of potassium fertilizer and potassium fertilizer is 0.35,recovery coefficient of potassium fertilizer and steel plate is 0.25,static friction coefficient of potassium fertilizer and potassium fertilizer is 0.4,static friction coefficient of potassi-um fertilizer and steel plate is 0.3,rolling friction coefficient of potassium fertilizer and potassium fertilizer is 0.2,rolling friction coefficient of potassium fertilizer and steel plate is 0.245.The combination of the above parameters was used to carry out the simulation test of angle of repose.The results of simulation angle of repose and physical test were compared and verified,and no significant difference was found by T test(T<T0.05/2).The results showed that it was feasible to calibrate key parameters of discrete element model of granular potassium fertilizer by response surface optimization,and the calibrated parameters could provide reference for discrete element simulation of granular potassium fertilizer.关键词
钾肥颗粒/离散元参数/标定/休止角Key words
potash granule/discrete element parameter/demarcating/angle of repose分类
农业科技引用本文复制引用
周滨,周岭,万畅,谭彧,何义川,王海刚,谭小华..基于休止角试验的颗粒钾肥离散元模型参数标定[J].农机化研究,2024,46(1):46-53,8.基金项目
南疆重点产业创新发展支撑计划项目(2020DB003) （2020DB003）
