Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting
Flax, an important oil and fiber crop, is widely cultivated in temperate and sub-frigid regions worldwide. China is one of the major producers of flax, with Gansu Province predominantly practicing cultivation in hilly areas. However, common issues such as feeding difficulties, stem entanglement, and...
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MDPI AG
2024-12-01
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| author | Ruijie Shi Leilei Chang Wuyun Zhao Fei Dai Zhenwei Liang |
| author_facet | Ruijie Shi Leilei Chang Wuyun Zhao Fei Dai Zhenwei Liang |
| author_sort | Ruijie Shi |
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| description | Flax, an important oil and fiber crop, is widely cultivated in temperate and sub-frigid regions worldwide. China is one of the major producers of flax, with Gansu Province predominantly practicing cultivation in hilly areas. However, common issues such as feeding difficulties, stem entanglement, and low threshing efficiency significantly restrict the improvement of planting efficiency. This study addresses the key technical challenges in flax combine harvesting in hilly regions by developing a discrete element model of the flax plant and utilizing DEM-FEA co-simulation technology. The performance of two threshing drum models (T<sub>1</sub> and T<sub>2</sub>) was analyzed, focusing on motion trajectory, stress distribution, and threshing effects. The simulation results show that the T<sub>2</sub> model, with its combination of rib and rod tooth design, significantly improves threshing and separation efficiency. The loss rate was reduced from 5.6% in the T<sub>1</sub> model to 1.78% in the T<sub>2</sub> model, while the maximum stress and deformation were significantly lower, indicating higher structural stability and durability. Field validation results revealed that the T<sub>1</sub> model had a total loss rate of 3.32%, an impurity rate of 3.57%, and an efficiency of 0.09 hm<sup>2</sup>/h. In contrast, the T<sub>2</sub> model achieved a total loss rate of 2.29%, an impurity rate of 3.39%, and an efficiency of 0.22 hm<sup>2</sup>/h, representing a 144.4% improvement in working efficiency. These findings indicate that the T<sub>2</sub> model has a higher potential for flax harvesting in hilly and mountainous regions, especially in improving threshing efficiency and operational stability, providing an important theoretical basis for optimizing threshing equipment design. |
| format | Article |
| id | doaj-art-1817b46e9a32486ebc4de4cd0314cb79 |
| institution | Kabale University |
| issn | 2073-4395 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj-art-1817b46e9a32486ebc4de4cd0314cb792025-01-24T13:16:27ZengMDPI AGAgronomy2073-43952024-12-011513610.3390/agronomy15010036Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined HarvestingRuijie Shi0Leilei Chang1Wuyun Zhao2Fei Dai3Zhenwei Liang4College of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou 730070, ChinaCollege of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou 730070, ChinaCollege of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou 730070, ChinaCollege of Mechanical and Electrical Engineering, Gansu Agricultural University, Lanzhou 730070, ChinaSchool of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, ChinaFlax, an important oil and fiber crop, is widely cultivated in temperate and sub-frigid regions worldwide. China is one of the major producers of flax, with Gansu Province predominantly practicing cultivation in hilly areas. However, common issues such as feeding difficulties, stem entanglement, and low threshing efficiency significantly restrict the improvement of planting efficiency. This study addresses the key technical challenges in flax combine harvesting in hilly regions by developing a discrete element model of the flax plant and utilizing DEM-FEA co-simulation technology. The performance of two threshing drum models (T<sub>1</sub> and T<sub>2</sub>) was analyzed, focusing on motion trajectory, stress distribution, and threshing effects. The simulation results show that the T<sub>2</sub> model, with its combination of rib and rod tooth design, significantly improves threshing and separation efficiency. The loss rate was reduced from 5.6% in the T<sub>1</sub> model to 1.78% in the T<sub>2</sub> model, while the maximum stress and deformation were significantly lower, indicating higher structural stability and durability. Field validation results revealed that the T<sub>1</sub> model had a total loss rate of 3.32%, an impurity rate of 3.57%, and an efficiency of 0.09 hm<sup>2</sup>/h. In contrast, the T<sub>2</sub> model achieved a total loss rate of 2.29%, an impurity rate of 3.39%, and an efficiency of 0.22 hm<sup>2</sup>/h, representing a 144.4% improvement in working efficiency. These findings indicate that the T<sub>2</sub> model has a higher potential for flax harvesting in hilly and mountainous regions, especially in improving threshing efficiency and operational stability, providing an important theoretical basis for optimizing threshing equipment design.https://www.mdpi.com/2073-4395/15/1/36combined harvestingflaxthreshing drumDEM-FEAsimulation |
| spellingShingle | Ruijie Shi Leilei Chang Wuyun Zhao Fei Dai Zhenwei Liang Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting Agronomy combined harvesting flax threshing drum DEM-FEA simulation |
| title | Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting |
| title_full | Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting |
| title_fullStr | Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting |
| title_full_unstemmed | Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting |
| title_short | Simulation of Flax Threshing Process by Different Forms of Threshing Drums in Combined Harvesting |
| title_sort | simulation of flax threshing process by different forms of threshing drums in combined harvesting |
| topic | combined harvesting flax threshing drum DEM-FEA simulation |
| url | https://www.mdpi.com/2073-4395/15/1/36 |
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