Abstract
The experimental results of the tribo-acoustic control in real time the integrity of nominally stationary friction joints under conditions of fretting are presented. 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: a direct cascade from mod the pump in the direction of high frequencies and the opposite – side to 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.
Highlights
Modern technological conditions of production activity present increased requirements to the accuracy and efficiency of measurements, to the quality of control and diagnostics of various aggregates at the stage of their design, manufacturing, testing, operation and repair
Acoustic methods have been widely used for analysis and to control friction [1–0]
Contactless acoustic control of sound and near infrasonic frequency bands based on standard or special software and hardware is much easier in technical implementation
Summary
Modern technological conditions of production activity present increased requirements to the accuracy and efficiency of measurements, to the quality of control and diagnostics of various aggregates at the stage of their design, manufacturing, testing, operation and repair. Acoustic methods, being one of the most informative, provide, on the one hand, the identification of various defects of the object of control, and, on the other hand, the ability to carry out operational measurements of the technological parameters of various processes. Modern development of analog and digital technology allows to significantly increase the sensitivity and accuracy of acoustic measurements, to expand the possibilities of their application for diagnostics and measurement of parameters of dynamic objects and processes. Contactless acoustic control of sound and near infrasonic frequency bands based on standard or special software and hardware is much easier in technical implementation. Due to the relatively low slip rates in fretting modes, the characteristic frequencies of acoustic emission fall precisely into the acoustic and near
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