A study on the characteristics of rotating friction-induced noise of ceramic seal rings

A ceramic seal ring used in the rotary mechanical seal is widely used in the field of aerospace,but the noise problem caused by dry friction has not been solved. Taking a ceramic sealing ring as the research object, vibration and noise signals were measured on the rotary friction test bench through vibration acceleration sensors and precision pickups. The characteristics and mechanism of the random roaring of rotary friction of ceramic seal rings were analyzed. Test results show that the frequency doubling response of vibration acceleration is associated with the high-frequency roar, and the rotation speed is the main factor affecting the characteristic frequency of vibration and whistling. According to the test, a finite element simulation model of the sealing ring was established. Using the transient dynamic analysis method, the characteristic frequency of each rotational speed is relatively consistent with the test; after obtaining the contact pressure of the friction surface, the repeated separation-attachment of the friction contact interface during rotation was found,which is considered to be the main mechanism of roaring in the experiment. In addition,the greater the rotation speed,the greater the contact pressure,so it can be inferred that the greater the friction force and the higher the roaring pressure level induced by it, which is consistent with the positive correlation between the rotational speed and the sound pressure level measured in the test. © 2024 Chinese Vibration Engineering Society. All rights reserved.