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As a critical insulating dielectric in high-voltage direct current transmission equipment, the comprehensive performance of polypropylene film has an important impact on the operational reliability and service life of power electronic devices. Therefore, it is urgent to establish a quantifiable and comparable comprehensive evaluation method. In this paper, a comprehensive performance evaluation index system of polypropylene film was constructed, and a comprehensive evaluation method combining combination weighting and extension cloud model was proposed. First, the subjective weights of indicators were determined by using the extension analytic hierarchy process, and the subjective weights were obtained by improved entropy weight method. On this basis, the optimization integration of subjective and objective weights were achieved through game theory. Subsequently, the extension cloud model was introduced to calculate the cloud correlation degree to complete the comprehensive performance grade determination of films, and the credibility of the evaluation results was tested in combination with the confidence factor. Finally, the reliability of the model was verified by objective performance characterization experiments. The results show that this method can achieve the grading of comprehensive properties of polypropylene films, and the evaluation results are in good agreement with the test conclusions regarding insulation, mechanical properties, and self-healing performance. The proposed comprehensive evaluation model is scientific and practical, which can provide an effective theoretical basis for the performance evaluation and material optimization design of polypropylene film.
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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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