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顆粒肥料離散元仿真摩擦因數(shù)標(biāo)定方法研究
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國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2017YFD0700904)、國(guó)家自然科學(xué)基金項(xiàng)目(51705191)和吉林省科技發(fā)展計(jì)劃項(xiàng)目(20180414074GH)


Calibration Method of Friction Coefficient of Granular Fertilizer by Discrete Element Simulation
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    對(duì)分體圓筒法、傾斜法、抽板法和斜面法4種顆粒特性測(cè)試方法進(jìn)行Plackett-Burman多因素顯著性篩選試驗(yàn),試驗(yàn)方差分析結(jié)果表明,不同的測(cè)試方法影響測(cè)量結(jié)果的顯著因素與因素顯著程度。根據(jù)分體圓筒法、傾斜法和斜面法的方差分析結(jié)果,提出一種基于顆粒物料整體特性的摩擦因數(shù)標(biāo)定方法,將仿真試驗(yàn)與真實(shí)試驗(yàn)相結(jié)合,依次標(biāo)定出尿素顆粒與PVC材料間靜摩擦因數(shù)為0.41,顆粒間靜摩擦因數(shù)為0.36,顆粒間滾動(dòng)摩擦因數(shù)為0.15。將所標(biāo)定的摩擦因數(shù)采用無(wú)底圓筒法進(jìn)行驗(yàn)證試驗(yàn),休止角仿真試驗(yàn)結(jié)果為30.57°,真實(shí)試驗(yàn)結(jié)果為31.74°,相對(duì)誤差為3.69%,不同含水率下的實(shí)際試驗(yàn)休止角與所標(biāo)定摩擦因數(shù)下的仿真休止角相對(duì)誤差均不大于4.59%,仿真試驗(yàn)結(jié)果與真實(shí)試驗(yàn)結(jié)果無(wú)顯著差異,驗(yàn)證了所標(biāo)定摩擦因數(shù)的有效性。本方法可用于其他顆粒狀物料間摩擦因數(shù)的標(biāo)定試驗(yàn)。

    Abstract:

    Whether the contact parameters between materials are set correctly affects the reliability of the results of discrete element simulation test. At present, the calibration method of contact parameters in discrete element simulation is still in the exploratory stage. Plackett-Burman multifactor significance screening test was carried out for four kinds of particle characteristics test methods: split cylinder method, tilt method, drawing plate method and inclined plane method. The analysis of variance of test results showed that the significant factors and factors influencing the measurement results were different from each other. According to the results of variance analysis of split cylinder method, inclined method and inclined plane method, a method of friction coefficient calibration based on the overall characteristics of particulate materials was proposed. The simulation test was combined with the real test, and the static friction coefficient between the urea particles and the PVC material was 0.41, the static friction coefficient between the particles was 0.36, and the rolling friction coefficient between the particles was 0.15. The calibrated coefficients were validated by the bottomless cylinder method. The angle of repose simulation test results was 30.57 degrees, the real test results was 31.74 degrees and the relative error was 3.69%. Under different water content conditions, the relative error between the actual test angle of repose and the simulated angle of repose under the calibrated coefficients was not greater than 4.59%. There was no significant difference between the simulation results and the real test results. The validity of the calibration coefficients was verified by the test results. This method can be used to calibrate the friction coefficient of other granular materials.

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溫翔宇,袁洪方,王剛,賈洪雷.顆粒肥料離散元仿真摩擦因數(shù)標(biāo)定方法研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2020,51(2):115-122,142. WEN Xiangyu, YUAN Hongfang, WANG Gang, JIA Honglei. Calibration Method of Friction Coefficient of Granular Fertilizer by Discrete Element Simulation[J]. Transactions of the Chinese Society for Agricultural Machinery,2020,51(2):115-122,142.

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  • 收稿日期:2019-06-27
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  • 在線發(fā)布日期: 2020-02-10
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