Centrifugal pump operation in cavitation mode may cause fast destruction of running wheel, pipe lines, and additional vibration loads at machine’s structure. In that connection, automatic diagnostics of cavitation mode is vital for safety of its operation.
Today, the main method of centrifugal pump condition evaluation, including its condition in cavitation mode, is the vibration-acoustic method, comprising the analysis of vibration signal on the surface of the machinery unit. As the result of the signal analysis, a special expert system creates a set of diagnostic features by which using rules of basic logic a diagnostic expert message is issued.
The paper dwells upon centrifugal pump cavitation diagnostics using one of modern methods of non-linear dynamics - the fractal theory, which uses Hurst index, correlating with vibration signal dimensions as a diagnostic feature. The main advantage of the feature is independence from the level of analyzed signal, and, consequently, from size and power of the machinery unit.
Kostyukov V.N., Boychenko S.N. Hurst index in real-time diagnostics and monitoring of centrifugal pump operation in cavitation mode // Dinamika sistem, mehanizmov i mashin (Dynamics of systems, mechanisms and machines). - Omsk: OmSTU, 2014. - Iss. 4. - p. 132-135.
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