基于离散元法的玉米秸秆双层柔性模型参数标定与试验OA
Parameter calibration and experiment of maize straw double-layer flexible model based on discrete element method
为了提高玉米秸秆加工环节中离散元仿真研究所用参数的准确度,本研究以甘肃地区种植的大京九26 玉米秸秆为研究对象,采用物理试验和仿真分析相结合的方法,进行玉米秸秆双层柔性模型的参数标定研究.首先,应用Plackett-Burman试验对玉米秸秆双层柔性模型的初始参数进行筛选,方差分析结果表明,玉米秸秆内穰弹性比、表皮弹性比和表皮塑性比对玉米秸秆轴向压缩破裂临界载荷有显著(p<0.05)影响.其次,以破裂临界载荷为评价指标,采用最陡爬坡和Box-Behnken试验建立了破裂临界载荷与上述 3 项参数的二次多项式回归模型,以物理试验得到的实际破裂临界载荷2 235.76 N为目标值,对各参数进行寻优,得到最优参数组合为内穰弹性比0.859、表皮弹性比0.848 和表皮塑性比0.869.最后,在该参数组合下构建玉米秸秆双层柔性模型,进行玉米秸秆轴向压缩、径向压缩和剪切试验对比,结果表明,轴向压缩仿真试验与物理试验的破裂临界载荷相对误差为0.55%,径向压缩仿真试验与物理试验的破裂临界载荷相对误差为6.87%,剪切仿真试验与物理试验的临界剪切力相对误差为8.50%,且秸秆受力变化趋势基本一致,说明最优参数组合具有可行性与准确性.本研究标定的玉米秸秆双层柔性模型可为秸秆加工装备的设计优化提供参考.
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.
史荣旭;宋学锋;张锋伟;戴飞
甘肃农业大学 机电工程学院,甘肃 兰州 730070甘肃农业大学 机电工程学院,甘肃 兰州 730070甘肃农业大学 机电工程学院,甘肃 兰州 730070甘肃农业大学 机电工程学院,甘肃 兰州 730070
农业科技
玉米秸秆离散元法双层柔性模型参数标定试验验证
maize strawdiscrete element methoddouble-layer flexible modelparameter calibrationexperimental validation
《浙江农业学报》 2026 (7)
1471-1480,10
国家自然科学基金(32260432)
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