辣椒籽离散元仿真模型参数标定与试验验证

Parameter calibration and test verification of discrete element simulation model of chili seed

摘要

为了给辣椒籽加工装置的设计与优化提供理论基础,以“红龙23号”辣椒籽为研究对象,采用离散元法对辣椒籽与钢板间的相互作用进行数值仿真研究,进行辣椒籽离散元仿真模型参数标定。首先,通过物理试验对辣椒籽基本物性参数、接触力学参数和休止角进行测定,参考物理试验测定结果选取仿真试验参数取值范围;再以辣椒籽休止角试验测量的值为响应值,由Plackett-Burman试验得到显著影响休止角的试验参数,分别为辣椒籽-辣椒籽静摩擦系数、辣椒籽-辣椒籽动摩擦系数、辣椒籽-钢板碰撞恢复系数,并在Plackett-Burman试验的基础上,通过最陡爬坡试验确定显著参数的取值范围,分别为0.20~0.40、0.10~0.42、0.10~0.34。其次,采用Box-Behnken试验设计,建立休止角与显著因素之间的二阶回归模型,以休止角物理实测值作为优化目标,对关键参数进行寻优后得到最优参数组合为辣椒籽-辣椒籽静摩擦系数0.29、辣椒籽-辣椒籽滚动摩擦系数0.16、辣椒籽-钢板恢复系数0.30。最后,通过仿真与物理试验对比,结果表明参数标定后的休止角仿真试验与物理试验的休止角形状相似,角度相对误差为1.76%,从而验证了标定参数可为辣椒籽加工装置仿真提供数据依据。

Abstract

To provide a theoretical foundation for the design and optimization of chili seed processing equipment, “Honglong No.23” chili seeds were selected as the research object. The discrete element method was employed to perform numerical simulations on the interaction between chili seeds and steel plates, accompanied by the parameter calibration of the DEM simulation model for chili seeds. Firstly, physical experiments were conducted to determine the basic physical properties, contact mechanical parameters, and repose angle of chili seeds, based on which the value ranges of simulation parameters were selected. Subsequently, with the measured repose angle of chili seeds as the response value, the Plackett-Burman experiment was carried out to identify the parameters that significantly affect the repose angle, namely the static friction coefficient between chili seeds, the dynamic friction coefficient between chili seeds, and the coefficient of restitution for collisions between chili seeds and steel plates. On the basis of the Plackett-Burman experiment, the steepest ascent experiment was used to determine the value ranges of these significant parameters, which were 0.20~0.40, 0.10~0.42, and 0.10~0.34, respectively. Secondly, the Box-Behnken experimental design was employed to construct a second-order regression model characterizing the relationship between the repose angle and its significant influencing factors. With the experimentally measured repose angle as the optimization objective, key operating parameters were systematically optimized, and the optimal parameter combination was ultimately determined as follows: the static friction coefficient between chili seeds was 0.29, the rolling friction coefficient between chili seeds was 0.16, and the coefficient of restitution between chili seeds and steel plates was 0.30. Finally, the comparison between simulation and physical tests demonstrates that the repose angle obtained from the calibrated simulation is consistent in shape with the physical test result, with a relative error of 1.76%. It is verified that the calibrated parameters can serve as a valid data reference for the simulation of chili seed processing devices.

关键词

辣椒籽 / 离散元 / 休止角 / 参数标定

Key words

chili seed / discrete element / angle of repose / parameter calibration

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基金资助

新疆生产建设兵团农业关键核心技术攻关项目(NYHXGG2023AA501)