【摘要】 目前圆捆秸秆处理设备中破包部件优化设计过程中缺乏准确的离散元仿真模型参数，在一定程度上降低了作物秸秆加工机具的研发改良效率。为了获取圆捆玉米秸秆离散元模型参数，以模型试验方法为基础，通过物理试验与在EDEM中的仿真试验进行离散元模型参数标定。首先进行物理试验测取物料接触参数临界值，进一步通过Design-expert中Plackett-Burman试验进行显著性筛选，结果表明圆捆玉米秸秆-圆捆玉米秸秆碰撞恢复系数、圆捆玉米秸秆-圆捆玉米秸秆静摩擦系数以及圆捆玉米秸秆-圆捆玉米秸秆滚动摩擦系数对堆积角有显著影响；其次，进行最陡爬坡试验对显著项参数取值范围进行优化，根据Boxbehnken试验建立显著因素与堆积角的二阶回归模型，以物理试验测得39.47°堆积角均值为目标值进行验证试验，得到显著参数最优参数组合为：圆捆玉米秸秆-圆捆玉米秸秆碰撞恢复系数0.37、圆捆玉米秸秆-圆捆玉米秸秆静摩擦系数1.22、圆捆玉米秸秆-圆捆玉米秸秆滚动摩擦系数0.54。以最优参数组合进行仿真试验与物理试验，t检验的显著性为p>0.05，结果验证了仿真堆积角数值与物理试验堆积角数值间无显著性差异；两者堆积角的相对误差为1.72%，进一步说明了试验结果的可靠性。研究所得最优参数组合可用于圆捆玉米秸秆破包过程的离散元仿真试验。更多还原

【Abstract】 The lack of accurate discrete element simulation model parameters in the optimization design process of bale breaking components for round bale straw processing equipment reduces the efficiency of development and improvement of crop straw processing tools to a certain extent. In order to obtain the discrete element model parameters of round bale corn stalk, based on the model test method, the discrete element model parameters were calibrated through physical test and simulation test in EDEM. Firstly,physical tests were carried out to measure the critical value of material contact parameters, and further significance screening was conducted through Plackett-Burman test in Design-Expert. The experimental results show that the collision recovery coefficient, static friction coefficient and rolling friction coefficient of round baled corn stover to round baled corn stover have significant effects on stacking angle. Secondly, the steepest climbing test was conducted to optimize the value range of significant parameters. According to Box-Behnken test, a second-order regression model of significant factors and repose angle was established. The mean value of repose angle of 39.47° measured in physical test was used as the target value for verification test, and the optimal parameter combination of significant parameters was obtained: Collision recovery coefficient between round corn stalk bales was 0.37, static friction coefficient between round corn stalk bales was 1.22, and rolling friction coefficient between round corn stalk bales was 0.54. The simulation and physical tests were carried out using the optimal parameter combination, the t test was conducted and the significance is p>0.05, the results verify that there is no significant difference between the simulation and physical test of the stacking Angle value; The relative error of the stacking angle is 1.72%, which further demonstrates the reliability of the experimental results. The optimal parameter combination can be used for discrete element simulation test of round bale corn straw breaking process.更多还原