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顆粒肥料離散元仿真摩擦因數(shù)標定方法研究
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國家重點研發(fā)計劃項目(2017YFD0700904),、國家自然科學(xué)基金項目(51705191)和吉林省科技發(fā)展計劃項目(20180414074GH)


Calibration Method of Friction Coefficient of Granular Fertilizer by Discrete Element Simulation
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    摘要:

    對分體圓筒法,、傾斜法、抽板法和斜面法4種顆粒特性測試方法進行Plackett-Burman多因素顯著性篩選試驗,,試驗方差分析結(jié)果表明,,不同的測試方法影響測量結(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)標定方法,將仿真試驗與真實試驗相結(jié)合,,依次標定出尿素顆粒與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,顆粒間滾動摩擦因數(shù)為0.15,。將所標定的摩擦因數(shù)采用無底圓筒法進行驗證試驗,,休止角仿真試驗結(jié)果為30.57°,真實試驗結(jié)果為31.74°,,相對誤差為3.69%,,不同含水率下的實際試驗休止角與所標定摩擦因數(shù)下的仿真休止角相對誤差均不大于4.59%,,仿真試驗結(jié)果與真實試驗結(jié)果無顯著差異,驗證了所標定摩擦因數(shù)的有效性,。本方法可用于其他顆粒狀物料間摩擦因數(shù)的標定試驗,。

    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)標定方法研究[J].農(nóng)業(yè)機械學(xué)報,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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