CALIBRATION AND EXPERIMENTS OF THE DISCRETE ELEMENT SIMULATION PARAMETERS FOR RICE BUD DAMAGE

Rice buds are easily bruised or broken during sowing, which affects the seedling rate, and discrete element simulation of rice lacks an accurate model in this process. The EDEM software was used to calibrate parameters for different states bud seeds damage. Hertz-Mindlin simulate accumulation seeds. Through a series tests, interspecific static friction factor 0.644, rolling 0.062. normal contact stiffness tangential were determined chest state 1-3 mm shoot length state, respectively, by using meta-particle function build seed sprouts applying bonding conduct Box - Behnken response surface tests shear damage sprouts. Finally, experiments carried out with hole-belt-type meter. results showed that under belt speeds, relative error between measured value simulated rate not more than 0.9%, indicating calibration reliable.