Abstract: In order to calibrate the discrete element simulation parameters of fish pellet feed and analyze the influencing factors of repose angle of fish pellet feed, this paper measured the repose angle of fish pellet feed based on stacking experiment. Taking Tongwei 150 model pellet feed as the research object, the funnel method, cylinder lifting method and suction plate method were used to realize the formation of the repose angle, and MATLAB software was used to process the accumulation image to determine the boundary contour of pellet feed. Plackett-Burman test was used to screen out three significant influencing factors: the static friction coefficient between feed and feed, the restitution coefficient between feed and feed, and the rolling friction coefficient between feed and feed. Finally, Box-Behnken test was used to construct the regression model of repose angle and significant influencing parameters. The optimal simulation parameters were determined by Design Expert optimization as the recovery coefficient between feed and feed is 0.28, the static friction coefficient between feed and feed is 0.31, and the rolling friction coefficient between feed and feed is 0.14, among which the static friction coefficient between feed and feed and its quadratic term have the greatest influence on the repose angle of granular feed. The experimental results provide a reference for the discrete element parameter calibration of fish pellet feed and the design of feed delivery and throwing equipment.

Key words: fish feed pellet, parameter calibration, discrete element method, response surface analysis

摘要： 为了标定鱼类颗粒饲料离散元仿真参数，分析颗粒饲料休止角的影响因素，本研究基于堆积试验对颗粒饲料的休止角进行了测定。试验以通威150型号颗粒饲料为研究对象，采用漏斗法、圆筒提升法和抽板法实现堆积角的成型，利用MATLAB软件对堆积图像进行了处理以确定颗粒饲料的边界轮廓，通过Plackett-Burman试验筛选出颗粒饲料之间的静摩擦系数、恢复系数和滚动摩擦系数三个显著影响因素，最后通过Box-Behnken试验，构建了休止角与显著影响参数的回归模型。通过Design Expert寻优确定其最佳仿真参数为：颗粒饲料之间的恢复系数为0.28，静摩擦系数为0.31，滚动摩擦系数为0.14，其中颗粒饲料之间的静摩擦系数及其二次项对颗粒饲料休止角影响最大。试验结果为状鱼类颗粒饲料的离散元参数标定以及颗粒饲料输送与抛洒设备的设计提供了借鉴与参考。

关键词: 鱼类颗粒饲料, 参数标定, 离散元法, 响应面分析