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深松土壤擾動(dòng)行為的離散元仿真與試驗(yàn)
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陜西省科技攻關(guān)項(xiàng)目(2013K02-11)、楊凌示范區(qū)科技計(jì)劃項(xiàng)目(2014NY-29)和2015年西北農(nóng)林科技大學(xué)重點(diǎn)項(xiàng)目(Z101021501)


Discrete Element Simulation and Experiment on Disturbance Behavior of Subsoiling
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    摘要:

    分析深松土壤的擾動(dòng)行為是深入研究深松鏟-土壤互作用規(guī)律的基礎(chǔ)。采用離散元方法建立深松工作模型,結(jié)合高速攝影技術(shù)及室內(nèi)土槽試驗(yàn),對(duì)比分析了不同位置深松土壤的微觀運(yùn)動(dòng)及宏觀擾動(dòng)行為。結(jié)果表明,土壤的擾動(dòng)范圍隨土壤與深松鏟之間距離的增大而減小;不同位置土壤的擾動(dòng)范圍由大到小依次為:淺層、中層、深層;在深松范圍內(nèi),土壤的運(yùn)動(dòng)速度隨土壤與深松鏟之間距離的增大而逐漸減小,等速度土壤顆粒的分布曲線(xiàn)與深松鏟的鏟柄弧線(xiàn)基本吻合;不同深度土層土壤顆粒在不同方向上的平均運(yùn)動(dòng)速度為:在x方向上由大到小依次為淺層、中層、深層,在y方向上由大到小依次為中層、淺層、深層,在z方向上由大到小依次為深層、中層、淺層;離散元仿真能夠較準(zhǔn)確模擬深松土壤的擾動(dòng)行為,仿真與試驗(yàn)獲取的土壤擾動(dòng)截面輪廓形狀基本吻合,土壤膨松度、土壤擾動(dòng)系數(shù)的仿真值與試驗(yàn)值的相對(duì)誤差分別為13.21%、17.38%;地表土壤縱向堆積角的仿真值與試驗(yàn)值的相對(duì)誤差為9.42%。

    Abstract:

    The study on disturbance behavior of subsoiling is the basis to understand the subsoiler-soil interaction law deeply. A working model of subsoiling was established by using discrete element method. In addition, with the aid of highspeed photography technique and the indoor soilbin test, the micro movement and the macro disturbance behavior of the soil at different positions were compared and analyzed. The results showed that, the disturbance range of soil was decreased with the increasing distance between the soil and the subsoiler, and at different locations, the disturbance range from large to small was the shallow layer, the middle layer and the deep layer. In the subsoiling range, the movement speed of the soil was decreased with the increase of the distance between the soil and the subsoiler. The distribution curves of the samespeed soil particles were basically consistent with the curves of the subsoiler. The average velocities of soil particles in different depths and different directions were measured from large to small as follows: the shallow layer, the middle layer, the deep layer in x direction; the middle layer, the shallow layer, the deep layer in y direction; and the deep layer, the middle layer, the shallow layer in z direction. The discrete element simulation could accurately simulate the disturbance behavior of subsoiling, and the shape of soil disturbance section of simulation and obtained from experiment were basically matched. The relative error of the soil bulkiness and soil disturbance coefficient between simulation and experiment were 13.21% and 17.38%, respectively. The relative error between the simulated longitudinal accumulation angle of the surface soil and that of experiment was 9.42%.

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黃玉祥,杭程光,苑夢(mèng)嬋,汪博濤,朱瑞祥.深松土壤擾動(dòng)行為的離散元仿真與試驗(yàn)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2016,47(7):80-88. Huang Yuxiang, Hang Chengguang, Yuan Mengchan, Wang Botao, Zhu Ruixiang. Discrete Element Simulation and Experiment on Disturbance Behavior of Subsoiling[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(7):80-88.

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  • 收稿日期:2016-04-12
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  • 在線(xiàn)發(fā)布日期: 2016-07-10
  • 出版日期: 2016-07-10