| Calibration and experimental validation of discrete element simulation parameters for Codonopsis pilosula seed |
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| DOI：10.7606/j.issn.1000-7601.2022.02.29 |
| Key Words: Codonopsis pilosula seed mechanized seeding discrete element model simulated seeding |
| Author Name | Affiliation | | TIAN Jianfeng | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SHI Linrong | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Xiaoping | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Yuan | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | BAI Yongxiang | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZANG Jin | College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| This study intended to provide basic simulation parameters for design and optimization of Codonopsis pilosula seed mechanized seeding equipment, including basic physical parameters of shape and size, mass density, bulk density, thousand grain weight and water content and the contact mechanics parameters of recovery coefficient, static friction coefficient for two types of Codonopsis pilosula seed (Weidang 1 and Gandang 2) grown in Gansu Province through experimental methods. The rolling friction coefficient between Codonopsis pilosula seed and ABS plastic plates was predicted by inclined rolling test combining with EDEM simulation. The rolling friction coefficient of Codonopsis pilosula seed was calibrated by adjusting the rolling friction coefficient between Codonopsis pilosula seed to make sure the seed stacking angle formed by the simulation similar to the actual stacking angle. The results showed that the static friction coefficients of Weidang 1 and Gandang 2 Codonopsis pilosula seed and ABS plastic plates were 0.368 and 0.341, respectively, and their interspecies static friction coefficients were 0.389 and 0.495, respectively. The collision recovery coefficients with ABS plastic plates were 0.591 and 0.518, respectively, and their interspecies collision recovery coefficients were 0.387 and 0.346. The rolling friction coefficients with ABS plastics were 0.163 and 0.168, and their interspecies rolling friction coefficients were 0.0153 and 0.0156, respectively. The simulated parameters were tested and verified for the shaped nest\|eye wheel seed rower, and the comparison results between simulation and bench test showed that the relative error was 3.16%. The study suggested that the discrete element model and underlying simulation data developed in this experiment could be used for the design and optimization of the Codonopsis pilosula seeder. |
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