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

FIELD: controlling.

SUBSTANCE: invention relates to methods of dynamic monitoring of friction units of mobile technical systems. Substance: the normal and the tangential components of frictional interaction forces, mutual tribospectrum thereof and autotribospectrum of the normal component, as well as the relationship thereof in form of a complex transmission coefficient or amplitude-phase-frequency characteristic, are analyzed. Diagnosis of the current state of frictional contact and prediction of change therein are performed based on the base of integral estimates on the entire frequency range of registration of the amplitude-phase-frequency characteristics of the tribosystem and on the given octave frequency ranges. The change in said estimates by a given peak factor value determines the sensitivity of the automatic control systems (ACS) by the tribosystem or the automatic control systems (ACS) of the regulatory type by the tribosystem parameters and constitutes an identification sign of transition from one stationary state to another. Diagnosis of the current state of frictional contact, identification of friction and wear processes, short-term or long-term prediction of changes therein are performed based on comparative analysis of the inherent tribospectral characteristics of frictional interaction of friction surfaces obtained based on methods of physical and mathematical modeling of friction processes and tribospectral characteristics of frictional interaction of friction surfaces of full-scale units. At the first stage of dynamic monitoring of full-scale mobile technical systems (MTS) a base of tribospectral characteristics is formed for identifying friction and wear processes occurring in frictional contacts of the MTS and registering periodic frictional interaction signals of interacting micro- and macroroughness of friction surfaces in the three-dimensional space, expanding periodic signals (inherent tribospectra) in Fourier series on a fixed frequency grid. At the second stage, periodic signals of frictional interaction of interacting micro- and macroroughness of the MTS friction surfaces are registered in three-dimensional space. At the third stage, estimation of the correlation of signals in form of Fourier series obtained in laboratory conditions and during operation of the MTS is performed. Sufficiency of the physical and mathematical model of the MTS and the full-scale MTS is ensured by means of performing physical and mathematical modeling on m-scales of linear dimensions followed by determining relative, absolute errors, concordance and correlation coefficients of the registered output parameters in m physical and mathematical models of the MTS.

EFFECT: increased sufficiency of a model and reduced number of model experiments.

1 cl, 1 dwg