Triboacoustic Control of Fretting

Аннотация

In the paper, we have presented experimental results on the real-time triboacoustic control of the integrity of a nominally motionless friction joint under fretting conditions. The disturbance in the integrity of the tribosuppression as a result of wear has been reliably detected both by the change in the shape of the acoustic histograms of the operating noise and by the change in the noise spectrum due to the appearance of strong mid-frequency modes of the contact gap. The appearance of two oppositely directed wave energy cascades in the regime of fretting has been observed, i.e., the direct cascade from the pumping modes toward the high frequencies and the reverse cascade toward the low infrasonic frequencies. The former has been associated with microplastic deformations in the zones of actual contact, while the latter has been associated with the dynamic generation of slow angular motions in the friction system.