Abstract: In order to obtain the accurate discrete element parameters of tobacco nutrient soil, the simulation parameter calibration of tobacco nutrient soil discrete element was carried out by combining simulation test and bench test. Taking the Angle of repose of tobacco vegetative soil as the response index and the Hertz-Mindli (no slip) discrete element contact model was used to design the Plackett-Burman test, to screen the discrete element simulation parameters of tobacco vegetative soil. The factors that had significant influence on the  resting Angle of tobacco vegetative soil were the static friction coefficient between vegetative soil, the rolling friction coefficient between vegetative soil and the static friction coefficient between vegetative soil and glass. In order to further obtain the optimal parameter combination of each factor, Box-Behnken experiment with three factors and three levels was designed, and the secondorder regression response model of the restangle parameters of tobacco vegetative soil was obtained. The results showed that the optimal parameter combination of discrete element model of tobacco nutrient soil was as follows: static friction coefficient of 0.67, rolling friction coefficient of 0.35, static friction coefficient of vegetative soil and glass of 0.35. Under the discrete element model obtained from calibration, the relative error of the resting  Angle obtained by simulation test and bench test is 2.59%.

Key words: tobacco nutrient soil, EDEM, angle of repose, simulation calibration

摘要： 为获得准确的烟草营养土离散元参数，采用仿真试验和台架试验相结合的方法，开展烟草营养土离散元仿真参数标定。以烟草营养土休止角为响应指标，采用Hertz-Mindli（no slip）离散元接触模型，设计Plackett-Burman试验，对烟草营养土离散元参数进行因素筛选，对烟草营养土休止角有显著性影响的因素分别为营养土间静摩擦系数、营养土间滚动摩擦系数和营养土—玻璃静摩擦系数；进行三因素三水平的Box-Behnken试验，获得各因素与烟草营养土休止角之间的回归方程。烟草营养土离散元模型参数标定结果为：静摩擦系数0.67、滚动摩擦系数0.35、营养土—玻璃静摩擦系数0.35。在标定所得的离散元模型下，仿真试验所得休止角与台架试验所得休止角值相对误差为2.59%。

关键词: 烟草营养土, EDEM, 休止角, 仿真标定