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濕軟地面農(nóng)用步行輪足壤互作力學(xué)模型研究
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國(guó)家自然科學(xué)基金項(xiàng)目(52105304)和現(xiàn)代農(nóng)業(yè)裝備與技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室項(xiàng)目(MAET202327)


Mechanical Modeling of Foot-terrain Interactions in Agricultural Walking Wheels on Wet and Soft Terrain
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    摘要:

    針對(duì)濕軟地面農(nóng)用步行輪足容易沉陷以及缺少相關(guān)互作力學(xué)理論等問(wèn)題,,對(duì)典型的足地互作承壓和剪切力學(xué)模型進(jìn)行了修正。首先通過(guò)設(shè)計(jì)不同剛?cè)嶙愣艘约皹?gòu)造不同濕度沙土和農(nóng)田土松軟地面,,利用萬(wàn)能試驗(yàn)機(jī)研究了足端對(duì)濕軟地面的承壓以及剪切阻力-位移變化規(guī)律,。其次通過(guò)EDEM離散元仿真方法探究了足端下顆粒速度場(chǎng)和運(yùn)動(dòng)趨勢(shì),用以觀測(cè)濕軟地面的細(xì)觀行為,。承壓試驗(yàn)中,,半圓柱體足端更容易破壞足端下土壤結(jié)構(gòu),其抗沉陷性能比長(zhǎng)方體足端差,。剛性與剛?cè)狁詈献愣说某袎禾匦圆町惒幻黠@,。沙土地面承載力隨濕度增加而提高,而農(nóng)田土則相反,。剪切試驗(yàn)中,,足端剪切阻力與濕度關(guān)系不大,但都隨著法向負(fù)載增加而增大,。足端持續(xù)推動(dòng)斜上方的土壤,,有較多的土壤堆積,因此需要進(jìn)一步考慮推土作用帶來(lái)的影響,。最后,,基于承壓試驗(yàn)數(shù)據(jù),對(duì)典型的承壓模型進(jìn)行修正,,補(bǔ)充了不同含水率沙土和農(nóng)田土地面的沉陷-深度關(guān)系,。基于剪切試驗(yàn)數(shù)據(jù),,對(duì)典型的剪切模型進(jìn)行修正,,得到考慮足端有推土影響的剪切阻力-位移關(guān)系,可為濕軟地面步行輪足研制提供設(shè)計(jì)參考和理論依據(jù),。

    Abstract:

    In response to the challenges posed by the sinking of agricultural walking wheels on wet and soft terrain, as well as the absence of a comprehensive interaction mechanics theory, the typical foot-terrain interaction models for pressure and shear mechanics were modified. Numerous foot-terrain interaction tests were conducted by using a universal testing machine to study the pressure and shear resistance-displacement of various foot designs on different types of wet and soft ground, including sand and soil with varying humidity levels. At the same time, the particle velocity field and motion trend of different types of foots on different wet and soft ground were investigated by means of EDEM discrete element simulation, which was used to observe the fine-scale behavior of wet and soft terrain. In the pressure test, the cylindrical foot was easier to sink compared with the rectangular foot. Combined with the simulation, the cylindrical foot was more likely to damage the soil structure under the foot, and the anti-subsidence performance of the rectangular foot was better than that of the cylindrical foot. The difference in intrusion resistance between rigid and rigid-flexible foots was not significant. The bearing capacity of sand was gradually increased with the increase of humidity, while the bearing capacity of soil was gradually decreased. In the shear test, the foot shear resistance of rigid cylindrical and rectangular foots under sand and soil with different humidity was related to the normal load, and both of them were increased with the increase of normal load. The foot shear resistance had little relationship with the medium humidity. Combined with the simulation, there was more soil accumulation in front of the foot in the process of foot shear, and the foot continuously pushed the soil above the slant, which needed the influence brought by the pushing effect to be further considered. Based on the pressure test data, the typical pressure-bearing model was modified, the subsidence-depth relationship of sand and soil with different humidity was supplemented. Based on the shear test data, the typical shear model was modified, and the shear resistance-displacement relationship was obtained by considering the influence of pushing soil. It can provide a design reference and theoretical basis for the development of a walking wheel foot on wet and soft terrain.

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韓佃雷,劉海瑞,任立志,胡錦瑞,李博,陳學(xué)庚.濕軟地面農(nóng)用步行輪足壤互作力學(xué)模型研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2024,55(11):461-474. HAN Dianlei, LIU Hairui, REN Lizhi, HU Jinrui, LI Bo, CHEN Xuegeng. Mechanical Modeling of Foot-terrain Interactions in Agricultural Walking Wheels on Wet and Soft Terrain[J]. Transactions of the Chinese Society for Agricultural Machinery,2024,55(11):461-474.

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  • 收稿日期:2024-01-13
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  • 在線發(fā)布日期: 2024-11-10
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