Construction of a soil clod recognition bench-scale experiment for discrete element method modeling of tilling phenomena

IF 2.4 3区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL Journal of Terramechanics Pub Date : 2023-10-01 DOI:10.1016/j.jterra.2023.06.004
Shuto Ishii , Isami Suto , Hiroaki Tabe , Kota Aono , Moju Zhao , Yoshifumi Ueshige , Kohei Matsushita , Takashi Iritani , Tadayuki Hanamoto , Masayuki Nakao , Keisuke Nagato
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Abstract

Rotary claws are used to break soil into small pieces and plow the soil flat. In this study, rotary claw development in tiller machines was evaluated using both equipment and the discrete element method (DEM). However, evaluation through equipment is imprecise and time consuming. Although DEM is an effective method for modeling the movement of granular materials, it requires numerous parameters to ensure accuracy, which must be determined through experimental evaluation and comparison. To resolve this concern, an image processing method was developed that leverages point cloud data obtained from a depth camera to capture changes in soil shape, distribution, and soil clod size before and after tilling. The effect of soil moisture content and claw rotation speed on soil clod formation and decomposition was evaluated. The experimental results show that the location, number, and soil clod size vary with soil moisture content and claw rotation speed. The results were compared with the DEM simulation to reconcile differences and confirm the feasibility of the proposed method. The model experiment system for soil clods and the image processing method facilitates a quantitative comparison between experimental and DEM simulated soil dispersal, which accelerates the search for DEM parameters to reproduce the tilling.

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离散元法模拟耕作现象的土块识别台架试验的建立
旋转爪是用来把土壤掰成小块,把土壤犁平的。在本研究中,采用离散元法(DEM)对分蘖机的旋爪发展进行了评估。然而,通过设备进行评估是不精确和耗时的。虽然DEM是一种有效的模拟颗粒状物质运动的方法,但它需要大量的参数来保证准确性,这些参数必须通过实验评估和比较来确定。为了解决这一问题,研究人员开发了一种图像处理方法,利用深度相机获得的点云数据来捕捉耕作前后土壤形状、分布和土壤块大小的变化。评价了土壤含水量和爪旋转速度对土壤结块形成和分解的影响。实验结果表明,爪爪的位置、数量和土块尺寸随土壤含水量和爪爪转速的变化而变化。将结果与DEM模拟结果进行比较,以调和差异,并验证所提方法的可行性。土块模型实验系统和图像处理方法便于将实验与DEM模拟的土壤分散进行定量比较,从而加快了对DEM参数的搜索以再现耕作过程。
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来源期刊
Journal of Terramechanics
Journal of Terramechanics 工程技术-工程:环境
CiteScore
5.90
自引率
8.30%
发文量
33
审稿时长
15.3 weeks
期刊介绍: The Journal of Terramechanics is primarily devoted to scientific articles concerned with research, design, and equipment utilization in the field of terramechanics. The Journal of Terramechanics is the leading international journal serving the multidisciplinary global off-road vehicle and soil working machinery industries, and related user community, governmental agencies and universities. The Journal of Terramechanics provides a forum for those involved in research, development, design, innovation, testing, application and utilization of off-road vehicles and soil working machinery, and their sub-systems and components. The Journal presents a cross-section of technical papers, reviews, comments and discussions, and serves as a medium for recording recent progress in the field.
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