浙江农业学报2026，Vol.38Issue(7)：1471-1480,10.DOI:10.3969/j.issn.1004-1524.20250269
基于离散元法的玉米秸秆双层柔性模型参数标定与试验
Parameter calibration and experiment of maize straw double-layer flexible model based on discrete element method
摘要
Abstract
To improve the accuracy of the parameters used in the discrete element simulation study of maize straw processing,this study took the straw of maize variety Dajingjiu 26 planted in Gansu Province as the research object,and used a combination of physical experiments and simulation analysis to calibrate the model parameters of the maize straw double-layer flexible model.First,the Plackett-Burman experiment was applied to screen the initial parameters of the double-layer flexible model of maize straw.The variance analysis results showed that the pith elastic ratio,rind elastic ratio,and rind plastic ratio of maize straw had a significant(p<0.05)impact on the axial compression criti-cal fracture load of maize straw.Secondly,using the critical fracture load as the evaluation index,a quadratic poly-nomial regression model was established with the steepest ascent and Box-Behnken test to determine the critical frac-ture load and the above three parameters.Taking the actual critical fracture load of 2 235.76 N obtained from physi-cal experiments as the target value,parameter optimization was performed,yielding an optimal parameter combina-tion of 0.859 for pith elastic ratio,0.848 for rind elastic ratio,and 0.869 for rind plastic ratio.Finally,a double-layer flexible model of maize straw was constructed under this parameter combination,and axial compression,radial compression,and shear tests of maize straw were compared.The research results showed that the relative error of the critical fracture load between the simulation and physical test of axial compression was 0.55%,the relative error of the critical fracture load between the simulation and physical test of radial compression was 6.87%,and the relative error of the critical shear force between the simulation and physical test of shear was 8.50%.The trend of straw stress variation was basically consistent,indicating that the optimal parameter combination is feasible and accurate.The calibrated double-layer flexible model provides theoretical references for the design optimization of maize straw processing equipment.关键词
玉米秸秆/离散元法/双层柔性模型/参数标定/试验验证Key words
maize straw/discrete element method/double-layer flexible model/parameter calibration/experimental validation分类
农业科技引用本文复制引用
史荣旭,宋学锋,张锋伟,戴飞..基于离散元法的玉米秸秆双层柔性模型参数标定与试验[J].浙江农业学报,2026,38(7):1471-1480,10.基金项目
国家自然科学基金(32260432) （32260432）
