Abstract
Cavitation failure often occurs in centrifugal pumps, resulting in severe harm to their performance and life-span. Nowadays, it has become crucial to detect incipient cavitation ahead of cavitation failure. However, most envelope demodulation methods suffer from strong noise and repetitive impacts. This paper proposes an adaptive Autogram approach based on the Constant False Alarm Rate (CFAR). A cyclic amplitude model (CAM) is presented to reveal the cyclostationarity and autocorrelation-periodicity of pump cavitation-caused signals. The Autogram method is improved for envelope demodulation and cyclic feature extraction by introducing the character to noise ratio (CNR) and CFAR threshold. To achieve a high detection rate, CNR parameters are introduced to represent the cavitation intensity in the combined square-envelope spectrum. To maintain a low false alarm, the CFAR detector is combined with the CNR parameter to obtain adaptive thresholds for different data along with sensor positions. By carrying out various experiments of a centrifugal water pump from Status 1 to 10 at different flow rates, the proposed approach is capable of cavitation feature extraction with respect to the CAM model, and can achieve more than a 90% detection rate of incipient cavitation and maintain a 5% false alarm rate. This paper offers an alternative solution for the predictive maintenance of pump cavitation.
Highlights
The centrifugal pump, as one type of fluid transport machinery, plays an important role in process industries, such as those of power, metallurgy, mining, and building, etc
These conclusions be recognized as incipient cavitation dueSF
At the 100% flow rate shown in Figure 11, the average combined square-envelope spectrum (CSES) spectrum of the Autogram resulted
Summary
The centrifugal pump, as one type of fluid transport machinery, plays an important role in process industries, such as those of power, metallurgy, mining, and building, etc. The driven fluids rush outward into a diffuser or volute chamber, and exit into the downstream piping system These complex working conditions will inevitably cause cavitation-related injury directly on pump impellers and shorten the life-span. With cavitation fast evolving from bubbles to clouds, it will generate harmful vibration and impulsive noise, and cause blade erosion and seal damage, seriously restricting the pump efficiency and shortening the life-span for a long run. As a consequence, such cavitation failure of critical pumps will result in costly downtime, system failure, and fatal accidents for all process industries
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