2017. Vol.20. 3, pp. 4–10
Vibroacoustic Diagnostics as the Basis of Machinery’s Health Monitoring
The paper is aimed at suggesting basic terminology for diagnostics, monitoring and vibroacoustics and the method of their application in real technological decisions.
The terminology is suggested by regulatory and procedural documents, reference, scientific and guidance literature, including the researches carried out by the authors.
The analysis of terminology used in Russia and abroad revealed that there are differences in understanding the methods of technological solutions of tasks in the fields of technological control, diagnostics, and machinery condition observation. In particular, the term «condition monitoring» is intended to be understood as condition control, not condition observation.
It is shown that the vibration acoustic signal is a random process, and vibroacoustic diagnostics requires analysis of its stochastic characteristics. It is necessary to measure the acceleration, velocity and displacement, since the stochastic characteristics of these vibroacoustic oscillations parameters are statistically independent.
The researches have concluded that real-time condition monitoring systems should provide real-time diagnostics of machinery at such time intervals that machinery condition cannot change from normal to limiting. To minimize the chance of skipping a dangerous condition and ensure reliable by vibroacoustic parameters one should measure vibration acceleration, velocity and displacement with an error which does not exceed 5 % in the frequency range of at least 3000 Hz.
Keywords: condition monitoring, real-time health monitoring system, failure, risk of dangerous condition skipping, error, acceleration, velocity, displacement.