Abstract
Purpose
In order to analyze the damage of castor capsule during mechanical harvesting, it is necessary to establish a suitable model and obtain the parameters of discrete element model. Therefore, the study establishes a three-compartment separation and crushing discrete element model of castor; the contact parameters and bonding parameters of the model are calibrated. The TongBi No. 16 castor variety in harvest period was taken as the research object. The sizes of whole castor capsule and single part were measured; then, the moisture content of castor in harvest period was measured.
Methods
In order to obtain the inherent parameters of the capsule, the elastic modulus was measured by TMS pro professional food physical property analyzer. In order to realize the three-compartment separation and fragmentation of castor, a discrete element model combining the aggregation and bonding model was established. The contact parameters are calibrated by stacking angle and formed by lifting method. The contour curve of accumulation angle is obtained with MATLAB software. The results show that the stacking angle of physical test is 26.216°. Through Plackett–Burman test, the contact parameters that have a greater impact on the stacking angle are the static friction coefficient between castors and the dynamic friction coefficient between castors. After the steepest climbing test, the value range is selected. Finally, through response surface optimization, the optimal static and dynamic friction coefficients between castors are determined to be 0.41 and 0.05, respectively.
Results
In order to obtain accurate bonding parameters, it is carried out through compression test. In order to reduce the damage to single compartment in the process of compression, spherical compression head is used. The results show that the maximum destructive force is 52.65 N. In conducting the simulation tests, the Box-Behnken response surface design is applied to derive the optimal bonding parameters, the normal stiffness per unit area is 9.47 × 107 N/m3, shear stiffness per unit area is 4.59 × 107 N/m3, normal strength is 7.92 × 103 Pa, and shear strength is 1.13 × 104 Pa. Finally, the stacking angle test and cone compression test are carried out by the final calibrated parameters. The relative errors between the simulation and the actual test are 1.82% and 4.10%, respectively, which indicate that the calibration results are reliable.
Conclusion
This study can provide the support of discrete element simulation parameters for analyzing the mechanism of castor capsule damage during mechanized harvest.
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Thanks to relevant scholars for their assistance in the literature.
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This research was supported by the China National Natural Science Foundation project, fund project number (51457312).
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Hou, J., Ren, Z., Liu, D. et al. Parameter Calibration of a Discrete Element Model for Three-Compartment Separation and Fragmentation of Castor Capsules During Harvesting. J. Biosyst. Eng. 48, 198–214 (2023). https://doi.org/10.1007/s42853-023-00183-z
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DOI: https://doi.org/10.1007/s42853-023-00183-z