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水稻秸稈離散元柔性模型參數標定與試驗驗證
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國家自然科學基金項目(32101625,、32271994)和中央高校基本科研業(yè)務費專項(2662023GXPY004)


Calibration and Verification of Flexible Rice Straw Model by Discrete Element Method
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    摘要:

    針對秸稈還田機具關鍵部件設計優(yōu)化過程中秸稈-刀具互作關系分析缺乏準確秸稈離散元模型的問題,,本文以水稻秸稈為研究對象,,基于Hertz-Mindlin with Bonding接觸模型,采用顆粒替換方式構建水稻秸稈離散元柔性模型,,開展了離散元接觸模型參數標定與多工況試驗驗證,。通過物理試驗測定了水稻秸稈摩擦因數,以秸稈彎曲試驗測得最大載荷作為參數標定試驗指標,,通過Plackett-Burman試驗和最陡爬坡試驗篩選柔性模型顯著性因素及其最優(yōu)值范圍,,并由Central-Composite試驗確定了顯著性因素的最優(yōu)值組合為:法向接觸剛度3.040×1010 N/m3、切向接觸剛度2.296×1010 N/m3,,該標定參數值所得最大載荷仿真值與實測值相對誤差為1.82%,,表明標定參數有效。通過刀具彎曲試驗和旋耕刀旋轉切割試驗驗證上述標定方法在不同工況下的有效性,,刀具彎曲試驗中仿真所得最大載荷與實測最大載荷相對誤差不大于4.55%,,旋耕刀旋轉切割試驗中仿真所得最大扭矩與實測最大扭矩相對誤差不大于7.95%,研究結果表明,,以彎曲試驗參數標定法構建的水稻秸稈柔性模型在秸稈彎曲試驗和旋耕刀旋轉切割過程仿真中均準確有效,,適用于旋耕作業(yè)條件下仿真分析,可為秸稈還田機具旋耕部件優(yōu)化設計提供參考,。

    Abstract:

    Rice straw in the fields of the middle and lower reaches of the Yangtze River exhibits high stubble retention and a substantial straw volume. The interaction between straw and tools are complicated and have a significant impact on the performance of straw incorporation implement. The lack of accurate rice straw model by discrete element method (DEM) limits the analysis of the interaction between straw and tools during the design and optimization of key components of straw incorporation implement. A flexible rice straw model was established by the particle replacement method based on the Hertz-Mindlin with Bonding contact model in DEM. Calibration of the discrete element model and multi-condition experimental verification were conducted. The friction coefficients of rice straw were determined through physical experiments, and the maximum load was measured in the straw bending test as the calibration index. The Plackett-Burman experiment and the steepest ascent experiment were used to select significant factors and their optimal value ranges for the flexible model, and the optimal parameter combinations for significant factors of the straw bonding model were determined by Central-Composite tests. The result was the normal contact stiffness was 3.040×1010 N/m3, and the tangential contact stiffness was 2.296×1010 N/m3. The relative error between the maximum load obtained from the simulation with the calibrated parameters and the actual maximum load with the experiment was 1.82%. It indicated the effectiveness of the calibration method. To verify the effectiveness of the above calibration method under different working conditions, the bending test of blades and the rotating cutting test of the rotary blade were conducted. The relative error between the maximum load obtained with the simulation and experiment in the bending test of blades was not more than 4.55%, while the relative error of the maximum torque between the simulation and experiment in the rotating cutting test of the rotary blade was not more than 7.95%. It indicated that the flexible rice straw model by DEM calibrated using the bending test was accurate and effective in simulating straw bending test and rotating cutting of the rotary blade processes and applicable to simulation analysis under the rotary tillage operating conditions. The research provided an effective model and method to analysis of the interaction between straw and tools for the optimization design of key components of straw incorporation implement.

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夏俊芳,張朋,苑宏文,杜俊,鄭侃,李宇飛.水稻秸稈離散元柔性模型參數標定與試驗驗證[J].農業(yè)機械學報,2024,55(9):174-184. XIA Junfang, ZHANG Peng, YUAN Hongwen, DU Jun, ZHENG Kan, LI Yufei. Calibration and Verification of Flexible Rice Straw Model by Discrete Element Method[J]. Transactions of the Chinese Society for Agricultural Machinery,2024,55(9):174-184.

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  • 收稿日期:2024-04-01
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  • 在線發(fā)布日期: 2024-09-10
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