Authors

Abstract

Calibrating the contact parameters when carrying out the seed pelletizing coating test could improve the simulation tests' accuracy. In this paper, alfalfa seeds and coated powders (hereafter referred to as seeds and powders) are used as the main object of study to calibrate their contact parameters, using the Hertz-Mindlin no-slip model and the JKR model to calibrate the contact parameters between seeds, between seed and steel plates (coating pot materials), between powder materials, between powder and steel plates, based on EDEM using the angle of repose as the response value to perform the Plackett-Burman test, the steepest ascent experiment, and the Box-Behnken test in turn to obtain the best combination of particle contact parameters, finally conducting physical angle of repose tests for comparison; when calibrating the contact parameters of seed and powder, the physical examinations and the simulation tests are combined to obtain the contact parameters through quadratic regression fitting equations. The difference between the contact parameter combinations obtained from the simulation tests and the physical test results is less than 1%, which provides some reference for calibrating similar fine seeds and powder parameters.

Abstract in Chinese

标定种子进行丸化包衣试验时的接触参数，可提高仿真试验的准确度。本文以紫花苜蓿种子和包衣粉料（以下简称种子和粉料）为主要研究对象标定其接触参数，接触模型分别采用Hertz-Mindlin无滑移模型和JKR模型（即Hertz-Mindlin with JKR模型）标定种子间、种子钢板（包衣锅材料）间、粉料间、粉料钢板间的接触参数，以颗粒休止角为响应值，基于EDEM依次开展Plackett-Burman试验、最陡爬坡试验以及Box-Behnken试验，得到颗粒最佳接触参数组合，最后开展物理休止角试验进行对比；将物理试验与仿真试验相结合标定种子与粉料间的接触参数时，通过二次回归拟合方程得到其接触参数。仿真试验得到接触参数组合与物理试验结果相差均小于1%，为相似小粒种子及粉料参数标定提供一定参考。