玉米秸秆粉碎离散元模型的参数标定

IF 0.6 Q4 AGRICULTURAL ENGINEERING INMATEH-Agricultural Engineering Pub Date : 2023-04-30 DOI:10.35633/inmateh-69-37
Mingrui Fu, Xiaoqing Chen, Zefei Gao, Chengmeng Wang, Bing Xu, Yilin Hao
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引用次数: 2

摘要

针对气固耦合法模拟分析玉米秸秆粉碎过程中缺乏可靠参数的问题,以玉米秸秆粉碎为研究对象,采用物理测量和虚拟实验相结合的方法对模拟参数进行了标定。通过物理实验获得CCS的固有参数,采用圆柱体提升法进行叠加试验,利用Matlab软件拟合边界线,得到实际休止角(AoR)为44.12°;建立了CCS的离散元模型,并利用EDEM软件进行了虚拟堆垛试验;通过Plackett-Burman试验确定CCS-CCS动摩擦系数、CCS-CCS静摩擦系数和JKR(Johnson Kendall-Roberts)表面能是对AoR有显著影响的参数;利用最陡爬升试验来确定响应面分析的中心;以AoR为评价指标,通过Box-Behnken试验建立了模拟参数与AoR的二次多项式回归模型,得到了重要参数的最优组合:CCS-CCS动摩擦系数为0.55,CCS-CCS静摩擦系数为0.14,JKR表面能为0.12;基于有效参数的最优组合进行了AoR验证试验。结果表明,CCS的AoR为43.82°,为实际AoR的0.68%,表明参数组合是可靠的。本研究获得的数据可以为CCS离散元模拟和秸秆微粉碎设备的开发提供相应的模拟参数。
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PARAMETERS CALIBRATION OF DISCRETE ELEMENT MODEL FOR CRUSHED CORN STALKS
For the problem of lacking reliable parameters during simulation analysis of the crushed corn stalk (CCS) micro-comminution process with gas-solid coupling method, the simulation parameters are calibrated using a combination of physical measurements and virtual experiments with CCS as the research object. The intrinsic parameters of CCS are obtained by physical experiment, and the stacking test is carried out by cylinder lifting method, and the actual angle of repose(AoR) is obtained as 44.12° by fitting the boundary line with Matlab software; the discrete element model of CCS is established, and the virtual stacking test is carried out by EDEM software; CCS-CCS dynamic friction coefficient, CCS-CCS static friction coefficient and JKR (Johnson-Kendall-Roberts) surface energy are identified as the parameters with significant effects on the AoR by Plackett-Burman test; the steepest climb test is leveraged to determine the center of response surface analysis; the quadratic polynomial regression model of the simulation parameters and the AoR is established by the Box-Behnken test using the AoR as the evaluation index, and the optimal combination of the significant parameters are obtained as follows: the CCS-CCS dynamic friction coefficient is 0.55, the CCS-CCS static friction coefficient is 0.14, and the JKR surface energy is 0.12; the AoR verification test is conducted based on the optimal combination of the significant parameters The results show that the AoR of the CCS is 43.82°, which is 0.68% of the actual AoR, indicating that the parameter combination is reliable. The data obtained in this research can provide corresponding simulation parameters for CCS discrete element simulation and the development of straw micro-crushing equipment.
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来源期刊
INMATEH-Agricultural Engineering
INMATEH-Agricultural Engineering AGRICULTURAL ENGINEERING-
CiteScore
1.30
自引率
57.10%
发文量
98
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