| Calibration of discrete element simulation parameters for sea buckthorn seeds and pomace |
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| DOI：10.7606/j.issn.1000-7601.2025.03.29 |
| Key Words: sea buckthorn seed pomace stacking angle simulation test EDEM |
| Author Name | Affiliation | | QIAO Weihao | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HU Jingming | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Mei | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YAN Huili | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Wenjie | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Qingze | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To address the issue of lacking accurate contact parameters in the mechanical separation of sea buckthorn seed and pomace mixtures after the beating of sea buckthorn berries to extract raw juice, the physical and contact parameters of the seeds and pomace were calibrated through both physical and simulation tests. The intrinsic parameters of sea buckthorn seeds were calibrated through physical tests. Using free fall, inclined plane slip, inclined plane rolling tests, and simulation analysis, the collision recovery coefficient, static friction coefficient, and rolling friction coefficient between the sea buckthorn seed and Q235 steel plate were determined to be 0.550, 0.449, and 0.039, respectively. Through the steepest climb test and Box-Behnken test, the contact parameter combination between sea buckthorn seed particles was optimized, and the collision recovery coefficient, static friction coefficient and rolling friction coefficient between sea buckthorn seed particles were determined by simulation test to be 0.150, 0.344, and 0.013, respectively. The Plackett-Burman test was designed to screen out three parameters related to fruit residue that had the most significant influence on the accumulation angle of the mixed materials of sea buckthorn seeds and fruit residue: Shear modulus of fruit slag, static friction coefficient of fruit slag and rolling friction coefficient of fruit slag were determined by the steepest climb test. The second\|order regression equation was established by the Central Composite test, and the optimal parameter combination of the three significant parameters was obtained by optimizing and solving the regression equation: the shear modulus of the slag was 1.57×106, the static friction coefficient between the slag and the slag was 0.303, and the rolling friction coefficient between the slag and the slag was 0.145. The relative error between the simulated stacking angle and the actual stacking angle was 2.78% through EDEM simulation. This study provides theoretical basis and model for the separation technology of sea buckthorn seeds and pomace. |
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