数字农科院2.0

Measurement and calibration of bonding parameters for a multi-scale DEM model of corn ears: experiment and simulation alignment

文献类型： 外文期刊

作者： Dandan Han;Tingyi Mo;Yunxia Wang;Chao Tang;Lin Chen;Lijia Xu

作者机构：

关键词： Bonded parameter calibration;Corn ear;flexible DEM model;Mechanical properties characterization;Threshing simulation

期刊名称： Advanced Powder Technology

ISSN： 0921-8831

年卷期： 2026 年 37 卷 2 期

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： An innovative flexible corn ear Discrete Element Method (DEM) model was established to effectively capture hierarchical anatomical properties of the corncob. By embedding kernel apices within the interstitial voids of xylem annulus particles and establishing multi-point adhesive connections, the model facilitates detachable kernel mechanics and corncob fracture dynamics. Experimental quantification yielded circumferential and axial threshing forces of 19.24 N and 28.70 N for four kernels arranged in a 2 × 2 matrix pattern relative to the corncob. These measurements served as benchmark criteria for systematic bonding parameter calibration. Sequential application of optimization tests identified the optimal bonding parameter set governing kernel–corncob interactions. Model validation demonstrated simulated circumferential and axial threshing forces of 19.37 N and 28.83 N, yielding relative errors of 0.68 % and 0.42 %. Implementation of the calibrated ear DEM model for longitudinal axial flow threshing apparatus simulation successfully reproduced dynamic bond failure mechanisms between kernels and corncob, axial kernel distribution patterns within the cylinder, and the inverse correlation between unthreshed rate and cylinder rotational velocity. The developed flexible ear DEM model substantially advances simulation authenticity and accuracy for threshing processes, furnishing a robust computational platform and theoretical basis for investigating low-loss, high-efficiency threshing separation mechanisms.

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