| Calibration and experimental verification of discrete element parameters of Pinellia ternata tuber |
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| DOI：10.7606/j.issn.1000-7601.2023.02.32 |
| Key Words: Pinellia ternata tuber discrete element model contact parament simulation test |
| Author Name | Affiliation | | WANG Feng | Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Fengwei | Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Luhai | Gansu Agricultural Mechanization Technology Extension Station, Lanzhou, Gansu 730070, China | | DAI Fei | Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | SONG Xuefeng | Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Xiaoping | Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Fangyuan | Mechanical and Electrical Engineering College, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To solve the problem with lack of intrinsic parameters and contact parameters of Pinellia ternata tuber during harvesting and processing of Pinellia ternata tuber simulation and analysis using the discrete element method, this study took the dry Pinellia ternata tuber as the research object, and measured the intrinsic parameters such as triaxial size, moisture content, density, Poisson’s ratio, elastic modulus and shear modulus. The impact recovery coefficient and static friction coefficient between Pinellia ternata tuber and steel plate were measured by impact bounce test and inclined plane sliding test. The discrete element model was established according to the tuber characteristics, and the rolling friction coefficient between Pinellia ternata tuber and steel plate was calibrated by inclined rolling test and EDEM simulation. Taking the average stacking angle of Pinellia ternata tuber as the response value and based on the response surface optimization method of quadratic regression orthogonal rotation combination test, the optimal parameter combination of collision recovery coefficient, static friction coefficient and rolling friction coefficient between Pinellia ternata tubers was determined. The results showed that the triaxial size of Pinellia ternata tuber was basically normal distribution. The size value was 4.03~26.68 mm. The density was 1 012.68 kg·m-3. The moisture content of wet basis was 45.54%. The Poisson’s ratio was 0.416. The average value of elastic modulus was 35.93 MPa, and the average value of shear modulus was 15.68 MPa. The collision recovery coefficient, static friction coefficient and rolling friction coefficient between Pinellia ternata tuber and steel plate were 0.509, 0.349 and 0.0735 respectively. The collision recovery coefficient, static friction coefficient and rolling friction coefficient between tubers of Pinellia ternata tuber were 0.587, 0.453 and 0.086, respectively. The parameters obtained were applied to the side wall collapse verification test. The verification test results showed that the simulation repose angle was 23.19°, the physical test repose angle was 22.56°, and the relative error of repose angle was 2.79%. The discrete element model of Pinellia ternata tuber and the basic parameters of contact parameters established by the study can be used for the simulation study of Pinellia ternata tuber related discrete element. |
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