METHOD OF DIAGNOSING TECHNICAL CONDITION OF ROLLING BEARINGS BY ANALYSIS OF VIBRATION SIGNALS Russian patent published in 2024 - IPC G01M13/04 

FIELD: measuring.

SUBSTANCE: invention relates to measurement equipment, namely to diagnostics of technical condition of rolling bearings, and can be used for evaluation and monitoring of current technical condition of rotating machines, assemblies and mechanisms. In the method of diagnosing the technical state of rolling bearings by analysing vibration signals, the reference signals of vibration sensors are determined, which are installed on the housing of a working bearing rotating on the shaft or on the surface of one of the non-rotating bearing rings at different speeds of rotation of the said shaft, performing mathematical processing of received signals using a computer system, then determining the experimental signals of vibration sensors installed on the housing of the rotating on the shaft of the bearing being diagnosed or on the surface of one of the non-rotating rings of this bearing at previously fixed frequencies of shaft rotation, their mathematical processing is carried out and reference and experimental results are compared. For mathematical processing of reference vibration signals of a sound bearing, vibration signals are measured and recorded on the housing of a rotating serviceable bearing or on the surface of one of the non-rotating bearing rings at different frequencies of rotation of the shaft on which the serviceable bearing is installed; recording the shaft rotation frequency values; for arrays of received vibration signals by method of non-intersecting window calculating average value and root-mean-square deviation by size of window k; pairwise calculating the correlation coefficients between the calculated root-mean-square deviations of the vibration signals by the size of the window k; reference values of calculated correlation coefficients are fixed for previously fixed frequencies of shaft rotations. For mathematical processing of vibration signals of the diagnosed bearing during operation, vibration signals are measured on the housing of the bearing rotating on the shaft or on the surface of one of the non-rotating bearing rings at previously fixed frequencies of shaft rotation; root-mean-square deviation and correlation coefficients are calculated by the size of the window k for the arrays of the received vibration signals of the bearing being diagnosed. Calculated values of the correlation coefficients for the sound bearing are compared with the calculated values of the correlation coefficients for the bearing being diagnosed; if the difference between the correlation coefficients of the diagnosed and sound bearing is more than 15 %, a conclusion is made on the presence of a defect in the bearing.

EFFECT: increasing the reliability of diagnostics of the technical condition of rolling bearings by analysing vibration signals during operation.

1 cl, 9 dwg