Authors

Abstract

In this study, based on the discrete element method, a simulation model was established to simulate the accumulation state of Tiger nut. Taking the angle of repose of Tiger nut as the response value, the Plackett-Burman test, the steepest climbing test and the central composite test were used to screen out the significant influencing factors and the optimal level, and the electromagnetic vibration hopper bench test was carried out to verify. The results showed that the relative error between the simulated angle of repose and the actual angle of repose was only 0.381 % when the static friction coefficient between the Tiger nut tubers was 0.35 and the rolling friction coefficient between the Tiger nut tubers was 0.036. The fitting degree of the prediction model of electromagnetic vibration hopper conveying time is 96.32 %, and the fitting degree of mass flow rate is 94.57 %. The calibrated parameters of Tiger nut can accurately reflect the actual test results, which can provide theoretical basis for the study of Tiger nut parameters and discrete element simulation.

Abstract in Chinese

本研究基于离散元法建立仿真模型模拟油莎豆堆积状态，以油莎豆休止角为响应值，采用Plackett-Burman试验、最陡爬坡试验和中心复合试验筛选出显著影响因素及最优水平，进行电磁振动料斗台架试验进行验证。结果表明：油莎豆块茎间静摩擦系数为0.35，油莎豆块茎间滚动摩擦系数为0.036时，仿真休止角与实际休止角相对误差仅为0.381%；电磁振动料斗输送时间的预测模型拟合度为96.32%，质量流率拟合度为94.57%，所标定的油莎豆参数能较准确反映实际试验结果，可为油莎豆参数特性研究以及离散元仿真工作提供理论依据。