Tribospectral Identification of Friction Processes of Ion-Plasma Coatings and Comparative Analysis of Their Energy Dissipation

The aim of the work is to theoretically substantiate the application of the tribospectral identification method of friction processes on a laboratory bench for tribological testing of samples with ion-plasma composite coatings, which allows varying the vibration effect on the tribocontact with specified amplitudes and oscillation frequencies, which allows for a comparative analysis of energy dissipation in the triboconjanction. Mathematical modeling was carried out, and the elastic and inertial, and dissipative parameters of the tribosystem (the friction pair “sample – counterbody”) were determined by varying the stiffness and damping of the composite coating. The formulated requirements for the bench are that for greater likelihood of identification of the friction and wear processes in the friction pair “sample – counterbody”, the software and hardware complex of the bench provides for the analysis of variations of the generalized coordinates in a wide range of frequencies from 0 kHz to 20 kHz as the load on the sample, the resistance torque, and the additional vibrator, providing external excitation of the tribocontact from the mechanical subsystem.

The article presents the results of comparative analysis of composite coatings of frictional and antifriction samples based on tribospectral identification of friction processes and assessment of energy dissipation. The study of friction application samples is implemented at a maximum resistance moment of 20 N∙m for laboratory friction machines, and the study of antifriction application samples corresponds to boundary and liquid friction (respectively, with a friction coefficient of μ = 0.15 and 0.05). The boundary conditions for the research are the minimum and maximum levels of the dimensionless damping coefficient of the tribosysteme. ξk(1) = 0.001 (boundary friction or mechanical characteristics of coatings with a low energy dissipation value) and ξk(2) = 0.707 (fluid friction, or coatings with a higher energy dissipation value), which corresponds to the decrement of damped oscillations χ_k⁽¹⁾ = 1.006 and χ ⁽²⁾ = 535.5, respectively.

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