CALIBRATION OF SIMULATION PARAMETERS OF COATED PARTICLES AND ANALYSIS OF EXPERIMENTAL RESULTS
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