Probabilistic and Statistical Criterions for Assessing the Condition by Vibroacoustic Signal Parameters

The paper presents the results of research in the technical diagnostics field. The criterion for assessing the state based on the parameters of the vibroacoustic signal characteristic function was selected and substantiated as a result of the conducted research. The proposed criterion is integral evaluation and makes it possible to form diagnostic signs of rolling bearings faults and failures of components for reciprocating compressors. In this work, the boundary values of the diagnostic signs are investigated on the basis of the values for the area under the curve of the modulus for the vibroacoustic signal characteristic function. The decision-making risk curves are built, the probabilities of missing a fault and a false alarm for selected values of diagnostic signs are calculated. The using of the proposed diagnostic signs in the system of the fault the defining criteria for rolling bearings and piston compressors makes it possible to increase diagnosis reliability.