Measurement and Calibration of the Discrete Element Parameters of Coated Delinted Cotton Seeds

Mengjie Hu, Junfang Xia, Yong Zhou, Chengming Luo, Mingkuan Zhou and Zhengyuan Liu
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Mengjie Hu: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Junfang Xia: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Yong Zhou: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Chengming Luo: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Mingkuan Zhou: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Zhengyuan Liu: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China

Agriculture, 2022, vol. 12, issue 2, 1-24

Abstract: To simulate the interactions between a pneumatic cotton precision seed-metering device and coated delinted cotton seeds accurately, physical and simulation experiments based on a rotating drum apparatus were combined to calibrate the discrete element simulation parameters of E`kangmian-10 cotton seeds. Firstly, the contact parameters and the dynamic repose angle of the cotton seeds were measured through physical tests. Based on the particle size requirement of the Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) coupling simulation and the reverse engineering technology, the cotton seed discrete element bonded-particle model (BPM) was established. Secondly, taking the contact parameters as calibration objects and the simulated dynamic repose angle as the evaluation index, a Plackett–Burman (PB) test was designed for significance screening. The results of the screening test showed that the static friction coefficient of cotton seed–tough photosensitive resin, the impact recovery coefficient of cotton seed–cotton seed, and the static friction coefficient of cotton seed–cotton seed had a highly significant effect on the simulated dynamic repose angle. Next, a Box–Behnken Design (BBD) test was adopted to establish the quadratic regression model between significant parameters and the simulated dynamic repose angle, and then the multi-factor optimization solution was carried out to obtain the optimal combination of parameters: the static friction coefficient of cotton seed–tough photosensitive resin and the impact recovery coefficient and static friction coefficient of cotton seed–cotton seed were 0.33, 0.06 and 0.10, respectively. Lastly, verification tests on the rotating drum apparatus and the seed-metering device were performed, and their relative errors were less than 2%, which indicated that the discrete element models and the contact parameters of the coated delinted cotton seeds were reliable. This study provides a reference for the selection of the discrete element parameters of coated delinted cotton seeds for DEM-CFD coupling simulation and the optimal design of precision seed-metering device for cotton.

Keywords: coated delinted cotton seed; discrete element; parameter calibration; dynamic angle of repose; seed-metering device (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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