1.College of Mechanical and Electrical Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China
2.College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350002,China
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文章历史+
Received
Accepted
Published
2025-06-05
Issue Date
2026-05-13
PDF (3084K)
摘要
为研究割草除根松土一体式刀片结构参数对其作业性能的影响,基于离散元法(discrete element method,EDEM)软件建立三维离散元仿真模型,模拟刀片在刨土作业过程中的破土效果。通过单因素试验分析前进速度、旋转速度及刀片倾角对破土率的影响规律,进一步采用Box-Behnken正交试验结合响应面分析法建立破土率预测模型并进行参数优化。正交试验结果表明,刀片倾角是影响破土率的主要因素,其次为旋转速度,三因素交互作用亦具有显著性。在最优参数组合下,前进速度1.39 m/s、旋转速度107 rad/s、刀片倾角4.7°,破土率达到78.3%。研究结果为山地割草除根松土装置的结构设计与参数配置提供理论依据和实践指导。
Abstract
In order to study the influence of the structural parameters of the integrated blade for mowing and root removal and looseing on its operational performance, this paper establishes a three-dimensional discrete element simulation model based on discrete element method (EDEM) software to simulate the soil breaking effect of the blade in the process of soil grubbing operation. The influence of forward speed, rotation speed and blade inclination angle on soil breaking rate is analyzed through one-factor test, and Box-Behnken orthogonal test combined with response surface analysis is used to establish the prediction model of soil breaking rate and optimize the parameters. The results of orthogonal test show that the blade inclination angle is the main factor affecting the soil breaking rate, followed by the rotation speed, and the interaction of the three factors is also significant. Under the optimal combination of parameters, with a forward speed of 1.39 m/s, a rotational speed of 107 rad/s, and a blade inclination angle of 4.7°, the soil breaking rate reached 78.3%. The results of the study provide a theoretical basis and practical guidance for the structural design and parameter configuration of mountain mowing and root removal and loosening devices.
颗粒间接触模型的科学选择对于确保离散元仿真结果的准确性具有决定性影响。在离散元仿真中可以选择Hertz-Mindlin(no slip)[10]、Hertz-Mindlin with JKR[11]、Hertz-Mindlin with bonding[12]和Linear cohesion等多种接触模型。本研究为履带式割草机的割草除根松土一体式刀片在南方丘陵山地的作业仿真。该地区气候温暖湿润,土壤含水率高且富含有机质和黏土,导致颗粒间毛细管力和黏附效应显著,表现出强黏聚性和黏弹性。传统的Hertz-Mindlin(no slip)模型适用于无黏性干颗粒,忽略了湿润土壤的黏附力,导致其预测的土壤力学特性与实际偏差大 (相对误差30%~45%)。相比之下,Hertz-Mindlin with JKR模型基于JKR理论,通过表面能参数γ量化颗粒间黏附,能更精确地模拟黏弹性颗粒的接触行为。当颗粒间直接接触时,为表征颗粒间黏结力,采用颗粒间切向重叠量、表面黏聚力以及接触参数来计算颗粒间法向接触力,其计算公式为
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