Simulation Parameter Calibration and Experimental Study of a Discrete Element Model of Cotton Precision Seed Metering

Abstract

To improve the accuracy of the parameters used in the discrete element simulation test, this study calibrated the simulation parameters of cotton seeds by combining a physical test and simulation test. Based on the intrinsic parameters used for the physical test of cotton seed, according to the freefall collision method, inclined plane sliding method, and inclined plane rolling method, the contact parameters of cotton seeds and cotton seeds, stainless steel, and nylon were measured, respectively. The physical test of the accumulation angle and angle of repose of the cotton seeds was conducted. It was obtained to process the image of the seed pile with Matrix Laboratory software. The Plackett–Burman test was used to screen the significance of the simulation parameters. The optimal value range of the significant parameters was determined according to the steepest climbing test. The second-order regression model of the significant parameters, the stacking-angle error, and the angle-of-repose error were obtained according to the Box–Behnken design test. Taking the minimum stacking-angle error and angle-of-repose error as the optimization target values, the following optimal parameter combination was obtained: the interspecies collision recovery coefficient was 0.413, the interspecies static friction coefficient was 0.695, and the interspecies rolling friction coefficient was 0.214. Three repetitive simulation experiments were conducted to prove the reliability of the calibration results. The research results can be used for discrete element simulation experiments for cotton precision seed metering.

Parameter calibration for simulation of Gentiana seedling substrate based on discrete element method

“…The contact mechanical parameters include coefficient of restitution, coefficient of static friction and coefficient of rolling friction. The coefficient of restitution was tested using the freefall collision method (Bai et al 2022) with the high-speed camera (PL2-C40C, Wuhan Kat Lite Technology Co., Ltd., China). The static friction coefficient and rolling friction coefficient are calculated using Eq.…”

Simulation and Experimental Study of a Split High-Speed Precision Seeding System

“…The hole sower model was simplified by removing the duckbill and non-essential parts, saving it as a STEP file and importing it into EDEM, as shown in Figure 11c. The material and contact parameters required for the simulation are shown in Table 1 [35]. The pellet plant was set up directly above the secondary seeding opening.…”

“…It produced cotton seed pellets at fixed intervals, with the seeding interval coinciding with the rotation of the seeding disc to ensure that adjacent seeds entered the adjacent compartment, and the initial seeding speed was set at 3 m/s. A transparent inoculum box below The material and contact parameters required for the simulation are shown in Table 1 [35]. The pellet plant was set up directly above the secondary seeding opening.…”

Physical parameter measurement and discrete element simulation parameter calibration with fresh Rhizoma polygonati

“…To improve the accuracy of parameters used in DEM simulation of sunflower clearing, Xiaoxiao Sun et al conducted physical experiments and DEM simulation to calibrate the parameters of sunflower [19]. In all, researchers have conducted DEM to calibrate various material parameters [20][21], but there is very little research on the physical properties of fresh R. polygonati.…”