Abstract

A set of suitable parameter values is crucial in discrete element method (DEM) simulations. As a non-spherical particle, the coefficients of rolling friction between maize seed particles and between the seed particles and the boundary are hard to measure directly and must be obtained by calibration. In this paper, taking three representative maize varieties as research objects, the necessity for the accurate calibration of the coefficients of rolling friction between seed particles and between seed particles and boundaries is investigated. Subsequently, by studying the sensitivity of the coefficients of rolling friction between seed particles and between seed particles and the boundary to the angle of repose test, the methods used to calibrate the coefficients of rolling friction between seed particles and between the particles and the boundary are determined. It can be seen from the results that the coefficients of rolling friction between the seed particles and between the seed particles and the boundary have a significant influence on the test results, so these two parameters must be accurately calibrated. Additionally, the coefficient of rolling friction between seed particles and the boundary has no effect on the piling angle, but the piling angle is highly sensitive to the coefficient of rolling friction between seed particles. By comparing the simulation results and the experimental results in the lifting cylinder and “self-flow screening” tests, the calibrated seed parameters were found to be accurate and valid.

Highlights

  • Some studies [2,3] showed that the coefficients of rolling friction of non-spherical particles did not need to be considered in discrete element method (DEM) simulation and the test requirements could be well met by calibrating the coefficient of sliding friction

  • Some studies suggested that the coefficient of rolling friction should be considered for non-spherical particles, and the coefficient of rolling friction had a large impact on the particle group behavior [4,5,6,7,8,9,10]

  • The effect of the coefficients rolling friction between seed particles and between seed particles and wall on the population behavior of seed particles is analyzed by piling angle and “self-flow screening” tests, and the calibration method of seed parameters is determined by the sensitivity study

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Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Some studies [2,3] showed that the coefficients of rolling friction of non-spherical particles did not need to be considered in DEM simulation and the test requirements could be well met by calibrating the coefficient of sliding friction. Calibrated the coefficients of rolling friction between maize particles and between seed particles and the wall. It is not accurate to obtain the contact parameters of maize seeds by a single-factor test without confirming that the calibration test is sensitive to only one of the parameters. The effect of the coefficients rolling friction between seed particles and between seed particles and wall on the population behavior of seed particles is analyzed by piling angle and “self-flow screening” tests, and the calibration method of seed parameters is determined by the sensitivity study. This article offers a reference for the calibration of particle parameters of maize seeds

Measurement of the Moisture Content of Seed Particles
Measurement of Seed Particle Density
Parameter
Particle Model of Maize Seed
Parameter Setting
Influence of Coefficients of Rolling of Friction between
Calibration of the Coefficient of Rolling Friction between Seed Particles
Calibration of the Coefficient of Rolling
Determination of the Coefficient of Rolling Friction between Seed Particles
12. Calibration
Physical
Physical Verification Test
LiftingonCylinder
14. Schematic
16. Schematic of the “self-flow screening” screening”
17. Comparisons
Conclusions
Full Text
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