畜牧用盐的离散元仿真接触参数标定方法

A method for calibration contact parameters in discrete elementsimulation of salt for animal husbardry

摘要

为获得畜牧用盐颗粒离散元仿真精确的接触参数和提高仿真可靠性,基于颗粒接触缩放原理进行颗粒缩放,采用台架试验与仿真试验耦合的标定方法,通过Plackett-Burman试验、最陡爬坡试验、Box-Behnken试验及单因素试验整合的三阶段DOE筛选 + 响应面优化系统方法,对畜牧用盐颗粒静摩擦系数、滚动摩擦系数等离散元仿真参数开展标定研究,筛选优化得到对休止角影响显著的3个关键参数分别如下:盐-盐滚动摩擦系数0.23、盐-盐恢复系数0.54、盐-钢滚动摩擦系数0.37;以实验与仿真休止角相对误差最小为优化目标,得到最优参数组合,仿真休止角为45.55°,与实验值45.27°的相对误差仅0.6%。相关性分析表明,盐-盐滚动摩擦系数、盐-钢滚动摩擦系数及盐-盐恢复系数均与休止角呈正相关,证实了所标定的接触参数可直接应用于畜牧用盐颗粒离散元仿真研究。

Abstract

To obtain accurate contact parameters for the discrete element simulation of livestock salt particles and ensure simulation reliability, particle scaling was performed based on the particle contact scaling principle. A coupled calibration method combining bench tests and simulation tests was adopted, and a systematic three-stage DOE screening and response surface optimization method integrating Plackett-Burman tests, steepest ascent tests, Box-Behnken tests, and single-factor tests was used to calibrate discrete element simulation parameters such as the static friction coefficient and rolling friction coefficient of livestock salt particles, three key parameters significantly affecting the angle of repose were screened and optimized: salt-salt rolling friction coefficient of 0.23, salt-salt restitution coefficient of 0.54, and salt-steel rolling friction coefficient of 0.37. With the minimum relative error between experimental and simulated angles of repose as the optimization objective, the optimal parameter combination was obtained. The simulated angle of repose was 45.55°, with a relative error of only 0.6% compared with the experimental value of 45.27°.Correlation analysis showed that the salt-salt rolling friction coefficient, salt-steel rolling friction coefficient, and salt-salt restitution coefficient were all positively correlated with the angle of repose. The results confirm that the calibrated contact parameters can be directly applied to the discrete element simulation of livestock salt particles.

关键词

盐粒 / 离散元法 / 接触参数 / 标定试验 / 休止角

Key words

salt granules / Discrete Element Method / contact parameters / calibration test / repose angle

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基金资助

新疆生产建设兵团科技计划项目(2024AB047)