DYNAMIC MONITORING OF MOBILE NONLINEAR TECHNICAL SYSTEMS Russian patent published in 2021 - IPC G01N3/56 

FIELD: mobile nonlinear technical systems (MNTS).

SUBSTANCE: present invention relates to methods for dynamic monitoring of mobile nonlinear technical systems (MNTS). The method consists in controlling the processes of friction and wear by analyzing the normal and tangential components of the forces of frictional interaction, their mutual spectrum and autotribospectrum of the normal component, as well as their ratio in the form of a complex transfer coefficient or amplitude-phase-frequency characteristic. A distinctive feature of the method is that, based on the quality criteria of the traditional theory of automatic control, for each moment of time, the maximum permissible levels of physical values ​​of the parameters are calculated, and on their basis, the following are realized: a) monitoring the change in the trend of the criterion of dissipative energy losses I_Q in time in octave frequency ranges, which makes it possible to establish their correlation with a given level of probability and the nature of changes in tribological parameters (for example, changes in the gradient of the friction coefficient) and, on this basis, to identify the most correlated frequency ranges at which the tribological properties of frictional contact are manifested, as well as changes in tribological parameters and external factors (for example, changes in the viscosity of the lubricant, a decrease in ambient temperature, the appearance of wear or athermal / thermal set bridges); b) monitoring the change in the trend of the dimensionless integral value of the damping coefficient Iξ in the octave (fractional octave) frequency ranges and the selection of the most correlated k-informative frequency ranges of tribospectral characteristics with k-tribological parameters and external factors of frictional interaction (for example, a change in the viscosity of a lubricant, a decrease in temperature ambient air, the appearance of wear, fretting corrosion or athermal / thermal setting bridges), which allows, with a given probability (0.95), to identify the moments of deterioration of the elastic-dissipative characteristics of the friction-mechanical system and, on this basis, to predict the subsequent behavior of the system and the residual life operation of a model or full-scale friction unit of an n-mass FMM; c) monitoring the change in the trend of the criterion of energy losses I_E allows to identify the stability of the frictional links in real time, the functioning of the friction unit; d) monitoring of the friction-mechanical system in time according to the generalized criterion of the dynamics I_d of the friction-mechanical system, and its threshold value of "warning" - values ​​"1" and "danger" - "1.15".

EFFECT: technical result is an increase in the accuracy of the results of model and full-scale tests and determination of the output parameters of the full-scale MNTS and its physical model.

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