Modelling soil-rotor blade interaction of vertical axis rotary tiller using discrete element method (DEM)

IF 2.4 3区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL Journal of Terramechanics Pub Date : 2024-01-18 DOI:10.1016/j.jterra.2024.01.001
Prakhar Patidar, Peeyush Soni, Achala Jain, Vijay Mahore
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Abstract

Vertical-axis rotary tillers are preferred over other soil-engaging tools for inter-culture operations due to their superiority in avoiding tillage pan formation, facilitating drainage, and operability at higher forward speeds. To optimize their design and operation, and to promote sustainable agricultural practices, a greater understanding of the kinematics, dynamics, and soil-structure interaction of vertical axis rotary tiller is required, along with the optimization of required energy. In this study, discrete element method (DEM) is used to analyse the interaction between soil and rotor blades, by incorporating the Hysteric Spring Contact Model along with linear cohesion model v2. Soil-rotor blade interaction DEM model is developed using Altair® EDEM® to analyse the effect of u/v ratio (2.13, 2.90, 3.70, and 4.44) and average operating depth (30 mm, 50 mm, and 70 mm) on draft and torque requirements for the rotor blade, as well as experimentally validating the simulation in a soil bin. In this study, lower u/v ratios in vertical axis rotary tillers demand higher torque for larger soil volumes. Additionally, torque rises with operating depth, owing to increased soil volume and strength. The simulated results closely followed the measured draft and torque for all combinations of u/v ratio and operating depth (R2 0.96 and 0.99). These findings indicate the DEM model as a dependable approach for modelling the performance of rotary tillers under different soil conditions.

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利用离散元素法(DEM)模拟垂直轴旋耕机的土壤-旋耕刀相互作用
由于垂直轴旋耕机在避免耕盘形成、促进排水以及在较高前进速度下的可操作性方面具有优势,因此与其他土壤耕作工具相比,垂直轴旋耕机更适合用于间作农业。为了优化设计和操作,促进可持续农业实践,需要进一步了解垂直轴旋耕机的运动学、动力学和土壤与结构的相互作用,同时优化所需的能量。本研究采用离散元素法(DEM)分析土壤与旋耕机叶片之间的相互作用,并结合 Hysteric Spring Contact Model 和线性内聚力模型 v2。使用 Altair® EDEM® 开发了土壤-转子叶片相互作用 DEM 模型,以分析 u/v比(2.13、2.90、3.70 和 4.44)和平均工作深度(30 毫米、50 毫米和 70 毫米)对转子叶片吃水和扭矩要求的影响,并在土壤仓中对模拟进行了实验验证。在这项研究中,垂直轴旋耕机的 u/v 比越低,土壤体积越大,所需的扭矩就越大。此外,由于土壤体积和强度的增加,扭矩会随着作业深度的增加而增加。在所有 u/v 比和作业深度组合下,模拟结果都与测量的牵引力和扭矩密切相关(R2 为 0.96 和 0.99)。这些结果表明,DEM 模型是模拟不同土壤条件下旋耕机性能的可靠方法。
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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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