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Research on the identification and diagnosis of high-frequency friction signals under abnormal contact conditions of mechanical seals is limited. Therefore, a seal monitoring test-bed is established using high-frequency, wide-range, and highly sensitive acoustic emission (AE) technology. Acoustic emission signals are collected under various operating conditions of the mechanical seal, including start-stop, no pressure, low pressure, high pressure, low speed, and high speed. Then the collected data are processed and analyzed using time-domain, frequency-domain and time-frequency-domain analysis methods. A method for determining the interface friction state of the mechanical seal, based on the root mean square (RMS) change of the AE signal, is established. This method reveals the corresponding relationship between the end-face friction signal and the running state of the mechanical seal, from contact to non-contact, and further proves the seal operation process. The research identifies the evolution of the friction signal during the transition from boundary lubrication (BL) and mixed lubrication (ML) in end-face contact friction to sliding contact signals under non-contact hydrodynamic lubrication(HL). The frequency band of the AE signal during seal interface friction is found to be between 240 kHz and 320 kHz. Through time-frequency analysis of the AE signal, it is shown that continuous wavelet transform (CWT) effectively represents the time-frequency characteristics of the AE signal under different working conditions of the mechanical seal. The research results of this paper provide a theoretical foundation and data support for research on mechanical seal condition monitoring and fault diagnosis.
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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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