Abstract
Off-design operation conditions might not only seriously affect the internal flow status of a centrifugal pump, but also result in additional energy loss and potential mechanical damage. Therefore, early-stage monitoring and predication on off-design operation conditions for centrifugal pumps have become essential. Single-value indicators have favorable factors such as a smaller amount of calculation and easier identification. As a result, industries prefer the more straightforward approach: obtaining single-value indicators directly from the signals which could be easier compared with accepted standards. The possibility of applying the single-value indicators of vibration into operation condition monitoring for a centrifugal pump is studied theoretically and experimentally, which shows that the statistical features of vibration might be suitable for hydraulic instability detection for a centrifugal pump.
Highlights
A centrifugal pump is supposed to keep operating under its design operation point, or best efficiency point (BEP), which is the specific combination of head, flowrate and rotational speed
This paper explores the characteristics for the vibration signal of a centrifugal pump through statistical analysis, and some conclusions that are as follows: This paper explores the characteristics forare thedrawn vibration signal of a centrifugal pump through statistical analysis, and some conclusions that arepump’s drawn are as follows:characteristics would change
Dynamic characteristics of the centrifugal pump’s performance characteristics would unstable flow status, which would be reflected in the vibration signal, and as change a result understatistical unstable flow status, which would be reflected in the vibration signal, and as a result analysis for vibration signal could be employed as an effective approach tostatistical detecting analysis for vibration signal could beforemployed as an effective approach to detecting off-design off-design operation conditions a centrifugal pump
Summary
A centrifugal pump is supposed to keep operating under its design operation point, or best efficiency point (BEP), which is the specific combination of head, flowrate and rotational speed. Plenty of investigation and discussion have been undertaken on the development of operation monitoring and fault diagnosis methods for centrifugal pumps based on the vibration signal. Sun et al [12] employed a cyclic spectral analysis method to process the non-stationary vibration signals acquired from a centrifugal pump operated under fault conditions. Single-value indicators could be directly obtained from signal, their calculation procedures are relatively simple, their change rules could reflect more clearly the operation tendency of equipment, and their values could be compared against accepted standards. From this point of view, single-value measurements could be more suitable for deployment in industries than formal methods. This study employs some statistical parameters as single-value indicators in order to reflect the pump’s operation status
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