关键词: 香菇菌渣颗粒, 含水率, 堆积角, 离散元, 标定参数

Abstract: In order to determine the accuracy of various parameters in discrete element simulation of mushroom residue particles at varying moisture contents, the EEPA contact model in the discrete element software EDEM was utilized for simulation and calibration of discrete element parameters between mushroom residue particles with varying moisture contents. Firstly, the Plackett-Burman test in the Design-Expert software was used to identify nine basic factors that influence the accumulation angle of mushroom residue particles. According to the results of the variance analysis, six basic characteristics had a substantial influence on the accumulation angle. Secondly, the steepest climb test was conducted to identify the ideal value range for these six major influence basic factors. Finally, by using the Box-Behnken test of the response surface, a quadratic polynomial regression model was developed between the accumulation Angle of mushroom residue particles and the six basic parameters with significant  influence. The regression model was subjected to variance analysis, and the optimal solution for the accumulation Angle model parameters of mushroom residue particles with varying moisture content was obtained respectively. The experimental results show that the relative error range between the pile Angle value derived by using the optimal solution simulation and the physical test value is 0.11% to 0.89%.

Key words: mushroom residue granules, moisture content, stacking angle, discrete element, calibration parameter