Authors

Abstract

To address the issue of insufficient parameters in the simulation of processes such as barley seedling stem harvesting using the discrete element method, this study focused on barley seedling stems of the Plante variety. Based on EDEM software, rigid (Hertz-Mindlin no slip model) and flexible (Hertz-Mindlin with bonding model) discrete element models were established. Combined with the results of physical tests, including the angle of repose (20.42°) and the average maximum load of three-point bending (2.62 N), parameters were screened and optimized through tests such as Plackett-Burman. The results showed that under the optimal contact parameter combination of the rigid model, the simulated average angle of repose was 20.31°, with an error of 0.78% compared to the physical test. For the flexible model, under the optimal bonding parameter combination, the simulated maximum bending stress was 2.64 N, with an error of 0.76% compared to the three-point bending test, verifying the accuracy of the models. The study indicated that the established models and parameters can accurately reflect the physicomechanical properties of barley seedling stems, providing a theoretical basis for the design and optimization of their harvesting, conveying, and processing machinery.

Abstract in Chinese

针对离散元法仿真大麦苗茎秆收获等过程时参数缺乏等问题，以普兰特品种大麦苗茎秆为对象，基于 EDEM 软件建立刚性（Hertz-Mindlin no slip 模型）与柔性（Hertz-Mindlin with bonding 模型）离散元模型，结合堆积角（20.42°）和三点弯曲平均最大载荷（2.62N）物理试验结果，通过 Plackett-Burman 等试验筛选优化参数。结果显示：刚性模型最优接触参数组合下，仿真平均堆积角20.31°，与物理试验误差 0.78%；柔性模型最优粘结参数组合下，仿真最大弯曲应力2.64N，与三点弯曲试验误差 0.76%，验证了模型准确性。研究表明，所建模型及参数可准确反映大麦苗茎秆物理力学特性，为其收获、输送及加工机械的设计优化提供理论依据。