Abstract
Based on the analysis of the works devoted to the selection of informative AE parameters for the diagnosis of tribosystems, in a theoretical way the information frequency ranges in the AE signal frame, where the maximum amplitudes values are observed, have been established. It has been theoretically and experimentally established that the information frequencies depend on the following groups of factors: the constructive; technological and operational ones. The degree of influence of the factors on the change in the frequency range is established. The operational factors (slip speed and load) change the frequency range from 106 to 584 kHz, the technological factors (roughness of the friction surfaces) change the frequency range from 118 to 618 kHz, the constructive factors (the size of the friction area of the stationary triboelement) change the frequency range from 140 to 530 kHz. It has been concluded that for the effective diagnosis of tribosystems, it is necessary to previously determine the information frequency range taking into account the factors listed above. The obtained results were confirmed experimentally with the calculation of the Fisher and Cochrane criteria, which allows one to state about the presence of a correlation between the theoretical values of the information frequencies generated by the tribosystem and the experimental values of the frequencies, where the maximum amplitudes were recorded, the correlation coefficient r = 0,88. The present analysis can be the basis for the development of a diagnostic method for tribosystems during their operation, which will increase the robustness and information content of the AE method.
Highlights
One of the most effective methods for diagnosing tribosystems is the method of acoustic emission (AE)
The obtained results were confirmed experimentally with the calculation of the Fisher and Cochrane criteria, which allows one to state about the presence of a correlation between the theoretical values of the information frequencies generated by the tribosystem and the experimental values of the frequencies, where the maximum amplitudes were recorded, the correlation coefficient r = 0,88
The AE signal from the friction zone is recorded by the GT300 (100 ... 800 kHz) broadband sensor, Fig. 1, which was mounted on the stationary triboelement, was transmitted to the amplifier, in the analogue form, to the USB oscilloscope PV6501, which performs the functions of the analogue-digital converter and spectrum frequency analyser at the same time
Summary
One of the most effective methods for diagnosing tribosystems is the method of acoustic emission (AE). Acoustic vibrations during friction are generated by the impact interaction of roughnesses and elastoplastic deformation of the mating surfaces, the processes of friction bonds fracture and structural-phase reconstruction of materials, the formation and development of cracks in the surface layers of the interacting bodies, and the separation of wear particles [1, 2]. As it is known, the frictional interaction of two bodies does not occur over the entire area of the contacting surfaces, but within the "actual contact spots". It is believed that this secondary process is the result of the interference of primary acoustic waves that satisfy the coherence condition [3, 4]
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