Full
Outline
In order to improve the magnetic field performance of the flat magnetic separator and reduce its manufacturing costs, the finite element method, response surface method, and Nondominated Sorting Genetic Algorithm Ⅱ (NSGA- Ⅱ) were used to perform multi-objective optimization analysis on the structural parameters of the planar extrusion magnetic system. Firstly, a response surface analysis experiment was conducted using the structural parameters of the extrusion magnetic system as variables. The response values of the area field intensity and magnet efficiency density were calculated through numerical simulation, and a regression model of the objective function was constructed. The fitting accuracy of each regression model was evaluated using analysis of variance. Then, a multi-objective optimization model was constructed with the objectives of area field intensity, magnet efficiency density, and number of magnetic poles, and a Pareto solution set was calculated to obtain a series of optimization schemes. The research results indicate that the regression model of area field intensity and magnet efficiency density has a high fitting accuracy and a good predictive ability. The Pareto solution set reveals a conflicting relationship between the area field intensity with the efficiency density and number of magnetic poles of the magnet. The error range between the multi-objective optimization model with the simulation results is 0.73%−5.30%, which verifies the reliability of the multi-objective genetic algorithm in optimizing the design parameters of the planar extrusion magnetic system.
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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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