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Aiming at the thermal ageing problem of composite insulator silicone rubber sheds, relevant research using nonlinear ultrasonic detection technology was conducted in this paper. First, accelerated thermal ageing tests were conducted on the silicone rubber sheds of composite insulators, and the material parameters of samples with different thermal ageing time were measured. Then, a simulation model for nonlinear ultrasonic detection of composite insulator silicone rubber was established, and a nonlinear ultrasonic detection platform was built to carry out ultrasonic detection experiments. Finally, the relationship between the thermal ageing time of the composite insulator silicone rubber material and the ultrasonic nonlinear coefficient obtained from both simulations and experiments was verified. The results show that as thermal ageing time increases, both the fundamental and second harmonic amplitudes of the thermally aged samples exhibit a decreasing trend, while the relative nonlinear coefficient increases significantly. The linear fitting degree between the relative nonlinear coefficient measured in the experiment and the thermal ageing time is high. Thermal ageing leads to changes in the macroscopic mechanical properties of the material, manifested as decreased density and increased elastic modulus, which causes attenuation of acoustic wave energy, while the change in internal structure of material enhances the nonlinear effect. The second-order relative nonlinear coefficient can effectively characterize the thermal ageing degree of composite insulator silicone rubber materials, providing a new method for the non-destructive testing of the thermal ageing state of composite insulators.
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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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