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Outline
In order to improve the performance and accuracy of discrete element method simulation optimization in the processes of blanking, conveying, and mechanical spreading of the shrimp feed pellet, the intrinsic parameters of the shrimp feed pellet, the contact parameters between feed, the contact parameters between feed and equipment were systematically calibrated. Taking Tongwei's columnar sinking shrimp feed pellet as research object, the DEM simulation parameters of the shrimp feed pellet were calibrated by combining physical and simulation experiments. Firstly, by using the physical test method, the density, Poisson's ratio, elastic modulus and shear modulus of the shrimp pelleted feed were measured to be 1 177.68 kg/m3, 0.26, 114.77 MPa and 45.58 MPa, respectively through instruments such as high precision digital calipers, electronic balances and pressure testing machines. Through inclined plane method and rebound method, the static friction coefficient, rolling friction coefficient, and restitution coefficient between the shrimp feed pellet and 304 stainless steel were determined to be 0.607, 0.097 and 0.35, respectively. The average stacking angle of the shrimp feed pellet was found to be 26.93°, and the feed's area coverage on a steel plate was 13.32% through stacking tests. Secondly, based on the Plackett-Burman experiment, the factors significantly affecting the physical stacking angle and area proportion were screened out to be the static friction coefficient between feed, the rolling friction coefficient between feed, and the static friction coefficient between feed and 304 stainless steel. Based on this foundation, the steepest ascent experiment was applied to converge the optimization range, and the parameter optimization was carried out by fitting the regression equation between the significant influencing factors and the response values through the Box-Behnken Design experiment. The optimal parameters combination were obtained as follows: the static friction coefficient between feed was 0.207, the rolling friction coefficient between feed was 0.150, and the static friction coefficient between feed and 304 stainless steel was 0.607. Finally, the reliability of the parameters was verified through stacking tests and spiral blanking tests. The findings revealed that the simulated stacking test results were statistically indistinguishable from the physical counterparts, as confirmed by a double-sample t-test. Furthermore, the correlation coefficient between the simulated and physical tests for the discharge amount line under varying speeds was an impressive 0.997, signifying a highly consistent trend with a discrepancy in discharge amount of less than 3% across all speeds. These results underscored the reliability of the calibrated DEM parameters for shrimp pellet feed, thereby establishing a solid data foundation and scientific rationale for investigating the motion mechanisms of shrimp feed pellets and optimizing equipment designs within DEM simulations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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