A method for calculating the dynamic characteristics of a nominally stationary friction couple under forced tangential vibrations was considered based on the quasi-static dependencies of contact displacement in response to external load. Within the framework of a one-term approximation (basic harmonics of vibrations) of an accurate solution of the equation for forced vibrations, some analytical expressions were derived for amplitude-frequency characteristics of the contact system under harmonic excitation being symmetrical relative to the unloaded state. The conditions for the couple falling outside the boundary preliminary displacement under vibrations as well as the influence of physical-mechanical contact parameters on its vibration stability are determined. Some features of friction contact as a nonlinear mechanical system are analyzed.
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