A general discrete element modelling method and harvest process for wheat plants

IF 5.3 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Biosystems Engineering Pub Date : 2025-09-09 DOI:10.1016/j.biosystemseng.2025.104284

Jianhua Fan , Liang Zhang , Kai Sun , Xiaoyan Qian , Lu Wang , Jianqun Yu

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引用次数: 0

Abstract

A general modelling approach for mature wheat plants with continuous deformation and breakable characteristics is proposed. First, by analysing the shape and size of three typical wheat plants as well as the coordinates of the discrete particles, the geometrical models of the wheat stalk, ear and grain that compose the wheat plant are constructed. Then, the physical and contact mechanical parameters of the wheat plant are determined and verified via a series of actual tests, including moisture measurement, drainage method, slope test and inclined plane drop test. In addition, the bonding mechanical parameters are obtained by analysing the results of the tensile, compression and shear experiments. On the basis of the above work, the mechanical model of the wheat ear, grain and stalk is constructed considering Hertz-Mindlin contact and bonding models with the discrete element method. Finally, the proposed wheat plant model is validated and verified by comparing the experiment and simulation results in terms of the harvest process including cutting and threshing. The results showed that the cutting force and total threshing rate obtained from the simulations differ from the actual test values by no more than 4.4 % and 9 %, respectively. The strong agreement between the simulation and experimental results indicates the feasibility and reliability of the proposed general modelling method for the wheat plant. In summary, the present study provides an effective tool to analyse the wheat harvest process and agricultural machinery design.

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一种通用的离散元建模方法及小麦收获过程

提出了一种具有连续变形和易碎特性的成熟小麦植株的通用建模方法。首先，通过分析三个典型小麦植株的形状和大小以及离散粒子的坐标，构建了组成小麦植株的麦秆、穗和籽粒的几何模型。然后，通过水分测量、排水法、坡度试验和斜面跌落试验等一系列实际试验，确定并验证了小麦植株的物理力学参数和接触力学参数。通过对拉伸、压缩和剪切试验结果的分析，得到了粘结力学参数。在上述工作的基础上，采用离散元法建立了考虑Hertz-Mindlin接触和粘接模型的小麦穗、籽粒和茎秆的力学模型。最后，通过对比实验结果和模拟结果，从收割、脱粒等收获过程对所提出的小麦植株模型进行了验证和验证。结果表明，模拟得到的切削力和总脱粒率与实际试验值的差异分别不超过4.4%和9%。模拟结果与实验结果吻合较好，表明所提出的小麦植株综合建模方法的可行性和可靠性。总之，本研究为小麦收获过程分析和农机设计提供了有效的工具。

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来源期刊

Biosystems Engineering 农林科学-农业工程

CiteScore

10.60

自引率

7.80%

发文量

239

审稿时长

53 days

期刊介绍： Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.