Test and Identification Analysis of Wear Response Signal of Contact Interface of Rotary Seal

Abstract The wear state of mechanical seal friction pair directly determines the reliability of mechanical seal. In this paper, the mapping mechanism between contact wear response and acoustic emission (AE) energy signal of friction pair is indicatively proposed, and the relationship between wear frequency and time-averaged wear is explored. First of all, AE sensors are arranged on the mechanical seal friction test-bed, static and dynamic friction tests are carried out on the contact form of M106K-WC (graphite-cemented carbide) and WC-WC, the AE energy signal data are collected, and the wear amount of the two groups of friction pairs is measured; then, the friction and wear signals are separated and reprocessed by time-frequency analysis. The results show that the static wear response frequency (SWRF) of M106K -WC is about 70 ± 10 kHz, the SWRF of WC-WC is about 90 ± 10 kHz, and the dynamic wear response frequency (DWRF) of WC-WC is about 175 ± 10 kHz;. At the same time, the root mean square of DWRF is positively correlated with the wear amount. According to the research results, it is inferred that there is a difference between the quasi-static wear frequency and the dynamic wear frequency of the friction pair, there is a great correlation between the dynamic wear frequency and the material pair, and the working condition has little influence on the wear frequency. the mapping relationship between AE signal and time-averaged wear of friction pair is revealed.