DEM model acquisition of the corn ear with bonded particle model and its simulated parameters calibration

IF 2.4 3区工程技术 Granular Matter Pub Date : 2024-04-12 DOI:10.1007/s10035-024-01427-1

Dandan Han, Yang Zhou, Junshan Nie, Qiqiang Li, Lin Chen, Qi Chen, Lihua Zhang

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Abstract

The corn variety “Zhenghong 507”, which is widely cultivated in hilly and mountainous areas of Southwest China, was assigned as the research object. The discrete element model of the mid-section of the corn ear that can be threshed was established by integrating the Hertz-Mindlin with the bonding V2 contact model, and the crucial bonding parameters were simulated and calibrated. With the measured normal threshing force (6.34 N) and tangential threshing force (4.75 N) of a single kernel as target values, the parameters of bonding characteristics between the kernel and the cob of corn ear were screened and optimized for significance via the Placket-Burman test, steepest ascent test, and the central composite design. The results indicate that the optimal parameter combinations for the normal stiffness and shear stiffness per unit area, normal strength, shear strength, contact radius between kernels, contact radius between cobs, and bonded disk scale were 3.4 × 10⁸ N·m⁻³, 2.238 × 10⁸ N·m⁻³, 0.6 × 10⁶ Pa, 0.364 × 10⁶ Pa, 1.87 mm, 16.5 mm and 1.321. Finally, the accuracy of the corn ear DEM model was validated by comparing the simulation to the physical test using the threshing rate as an evaluation index combined with the quality distribution of kernels after threshing.

Graphical Abstract

Calibration and validation of a corn ear bonded model.

Abstract Image

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利用粘结颗粒模型获取玉米果穗的 DEM 模型及其模拟参数校准

以广泛种植于中国西南丘陵山区的玉米品种 "正红 507 "为研究对象。通过整合赫兹-明德林与粘结 V2 接触模型，建立了可脱粒玉米果穗中段的离散元模型，并模拟和校准了关键的粘结参数。以测得的单个籽粒法向脱粒力（6.34 N）和切向脱粒力（4.75 N）为目标值，通过普拉克特-伯曼试验、最陡坡试验和中心复合设计，筛选并优化了籽粒与玉米穗棒之间的结合特性参数。结果表明，单位面积法向刚度和剪切刚度、法向强度、剪切强度、籽粒间接触半径、果穗间接触半径和粘合盘尺度的最佳参数组合分别为 3.4 × 108 N-m-3、2.238 × 108 N-m-3、0.6 × 106 Pa、0.364 × 106 Pa、1.87 mm、16.5 mm 和 1.321。最后，以脱粒率为评价指标，结合脱粒后籽粒的质量分布，将模拟结果与实际测试结果进行比较，验证了玉米果穗 DEM 模型的准确性。图文摘要

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.