STUDY ON VIBRATION ADSORPTION CHARACTERISTICS OF SMALL-PARTICLE-SIZE SEEDS BASED ON DEM
In order to explore the effect of vibration on the adsorption characteristics of small particle size seeds, based on the discrete element method, the changes in the variance of the average tangential force of seeds under different amplitudes were analyzed. The variance of the average tangential force of the seeds increases exponentially with the amplitude. It is inferred that the vibration will change the intensity of the population disturbance. This reduces the seed transient tangential force i.e. transient seed internal friction. To improve the adsorption characteristics of small-sized seeds, the adsorption characteristics at different amplitudes were verified with bench tests. Increasing the amplitude can improve the adsorption characteristics of small-sized seeds. To determine the optimal operating parameters, based on the Box–Behnken test principle, response surface tests were carried out using rotational speed, negative pressure, and amplitude as test factors and seed suction compliance and leakage rate as evaluation indexes. The optimum operating parameters were determined as: rotational speed of 12.05 r/min, negative pressure of 0.89 kPa, and amplitude of 5.75 mm. At this time, the seed suction pass rate was 95.1% and the leakage rate was 2.1%. which is in line with the standard requirements.
Abstract in Chinese