Parameter Calibration and Systematic Test of a Discrete Element Model (DEM) for Compound Fertilizer Particles in a Mechanized Variable-Rate Application

In order to obtain accurate discrete element simulation model (DEM) parameters of compound fertilizer and solve the problem challenging measurement contact particle, calibration test was carried out by using EDEM soft-ware. This study measured intrinsic particles through physical tests established a that corresponds with actual situation calibrate particles. By Blackett-Burman test, had significant impact on fertilizer’s resting angle were determined fertilizer-fertilizer collision recovery coefficient, rolling friction fertilizer-steel static coefficient. Utilizing steepest ascent ideal value intervals for three key identified. Box-Burman response surface analysis used establish optimize regression rest parameters. With as target value, best combination found, which verification test. The simulated 20.61°, whereas real 19.95°, relative error 3.31%. results demonstrate are essentially representations characteristics, can serve reference point research optimization design variable spreader.