基于堆积试验的黑水虻离散元仿真参数标定与分析

为解决黑水虻在畜禽粪便处理后续分离环节中应用筛分机械作业难、缺乏准确离散元仿真模型等问题,以黑水虻为研究对象,基于EDEM仿真软件模拟,选取系统中“Hertz-Mindlin with JKR”接触模型,以堆积角为评价指标,对黑水虻离散元仿真模型参数标定进行研究。首先,通过Plackett-Burman试验筛选对黑水虻堆积有显著影响的3个参数项(黑水虻剪切模量、黑水虻间静摩擦系数、黑水虻间滚动摩擦系数);然后,结合抽板法堆积物理试验,利用最陡爬坡试验确定显著性参数的最优区域;最后,进一步以堆积角为响应值,基于二次回归正交旋转组合试验得到堆积角与显著性参数的二阶回归模型,并以实际堆积角为目标,针对显著性参数进行寻优,确定EDEM仿真试验中黑水虻的最佳接触参数,得到最佳组合:黑水虻剪切模量8.67 MPa、黑水虻间静摩擦系数0.43、黑水虻间滚动摩擦系数0.32。运用最佳参数组合进行仿真分析,得到堆积角的均值为35.84°,与物理试验测得堆积角34.66°的相对误差为3.40%。研究结果表明,使用该方法对黑水虻离散元仿真参数的标定具有可行性,为基于EDEM软件设计与研究黑水虻筛分机械提供有效物料特性数据基础。

Calibration of parameters of black soldier fly in discrete method simulation based on response angle of particle heap

Black soldier fly plays an important role in reducing the cost of livestock and poultry manure discharge and farm pollution. However, black soldier fly separation was a difficult procedure for the follow-up comprehensive utilization of livestock manure. The parameters of discrete element model for black soldier fly was important for black soldier fly separation based on EDEM simulation software. A method was proposed to calibrate the parameters of discrete element model for black soldier fly based on tests of the angle of repose. Firstly, the “Hertz-Mindlin with JKR” contact model in the system was selected and the angle of repose was taken as the evaluation index to calibrate the parameters for the discrete element simulation model of the black soldier fly. Secondly, it was found that not all discrete element model parameters of black soldier fly had significant impact on the angle of repose, only three parameters (shear modulus, static friction coefficient and rolling friction coefficient of the black soldier fly) that had significant influence on the accumulation of the black soldier fly were selected by Plackett-Burman design test. Then, the best range of three significant influencing factors was determined by the steepest climbing test, the other seven factors in this test were the intermediate values of the initial range, and the three significant parameters gradually were increased and decreased until the relative error between the simulated value and the physical test value reached the minimum. Finally, the accumulation angle of black soldier fly was taken as the response value, quadratic regression orthogonal rotation combination test was used, and the repose angle regression model was obtained. The regression model was optimized, and the optimal values of three significant factors were obtained: black soldier fly shear modulus was 8.67 MPa, static friction coefficient was 0.43, rolling friction coefficient was 0.32. By using the optimal parameter combination for simulation analysis, the mean value of the accumulation angle was 35.84°, the physical test was 34.66°, the relative error between them was 3.40%. The results showed that this method was feasible for the calibration of discrete element simulation parameters of the black soldier fly, which provided a basis for material characteristics data for the design and research of screening machinery of the black soldier fly based on EDEM software.