Detection of shaft-seal rubbing in large-scale power generation turbines with acoustic emissions. Case study

Cooke, Alastair; Roby, D; Hewitt, G. W.

doi:10.1243/095765004773644076

Cited by 20 publications

(13 citation statements)

References 24 publications

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“…monitoring of rotating machinery has been growing over recent years [1][2][3][4][5][6][7][8][9]. Typical frequencies associated with AE activity range from 20 KHz to 1MHz.…”

Section: Application Of the High Frequency Acoustic Emission (Ae) Tecmentioning

confidence: 99%

The application of acoustic emission for detecting incipient cavitation and the best efficiency point of a 60kW centrifugal pump: case study

Alfayez

Mba

Dyson

2005

NDT & E International

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Pumps play a significant role in industrial plants and need continuous monitoring to minimise loss of production. To date, there is limited published information on the application of Acoustic Emission (AE) to incipient pump cavitation. This paper presents a case study where AE has been applied for detecting incipient cavitation and determining the best efficiency point (BEP) of a 60KW centrifugal pump. Results presented are based on NPSH (Net Positive Suction Head) and performance tests. In conclusion the AE technique was shown to offer early detection of incipient cavitation, furthermore, the technique has demonstrated the ability to determine the BEP of a pump.

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“…monitoring of rotating machinery has been growing over recent years [1][2][3][4][5][6][7][8][9]. Typical frequencies associated with AE activity range from 20 KHz to 1MHz.…”

Section: Application Of the High Frequency Acoustic Emission (Ae) Tecmentioning

confidence: 99%

The application of acoustic emission for detecting incipient cavitation and the best efficiency point of a 60kW centrifugal pump: case study

Alfayez

Mba

Dyson

2005

NDT & E International

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show abstract

“…Application of the high frequency acoustic emission (AE) technique in condition monitoring of rotating machinery has been growing over recent years [1][2][3][4][5][6][7][8][9][10][11]. Typical frequencies associated with AE activity range from 20 kHz to 1 MHz.…”

Section: Introductionmentioning

confidence: 99%

Detection of incipient cavitation and determination of the best efficiency point for centrifugal pumps using acoustic emission

Alfayez

2005

Proceedings of the Institution of Mechanical Engineers, Part E:

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Pumps play a significant role in industrial plants and need continuous monitoring to minimize loss of production. To date, published information on the application of acoustic emission (AE) to incipient pump cavitation has been contradictory. This article re-assesses the application of AE for detecting incipient cavitation. In addition, this paper presents results from an on-going programme to ascertain the applicability of the AE technique for determining the best efficiency point (BEP) of an operating system. Three different sized pumps (60 kW, 127 kW, and 2.2 MW) formed the basis of this investigation, which included NPSH (net positive suction head) and performance tests. Results obtained demonstrate the successful use of the AE technique for detecting incipient cavitation and highlight the enormous potential of the technique in determining the BEP of a pump or system.

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“…The vibration technique has been investigated and is established as a diagnostic technique for rotating tools in machinery in [5-7, 12, 17, 19]. The use of acoustic emission in the rail track fault detection was investigated in [23], in powerful mechanical units -in [21,24], in gearboxes -in [20,22,25]. A number of researches present vibration analysis for early fault detection [8,9].…”

Section: Introductionmentioning

confidence: 99%

Method for vibro-acoustic signal processing for detection of nascent defect of mechanical assemblies

Lange¹,

Yaroslavkina²

2017

Proceedings of the International Conference "Actual Issues of Mechanical Engineering" 2017 (AIME 2017)

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Abstract-In the article, the method of early diagnostics of nascent defects of mechanical assemblies (friction nodes, bearing pairs, gears) is considered by on-line determination of high-order statistical moments of the vibro-acoustic signal. To determine such statistical moments, a parabolic spline approximation of the discrete signal values is used. The spline approximation coefficients are determined at each discrete sampling interval by digital filter expressions. Expressions for the second, third and fourth statistical moments of the vibroacoustic signal are determined using its parabolic and cubic spline approximation. The signal processing is simple enough and can be implemented in a microprocessor controller. The characteristics of the proposed method are determined by an example of processing a vibro-acoustic signal of a harmonic shape. It is shown that with a relatively rare signal sampling, the error in determining the dispersion and the fourth statistical moment (Excess) of the signal is rather small. The use of a parabolic spline approximation of a vibro-acoustic signal makes it possible to significantly reduce the frequency of the signal sampling and to reduce the amount of data needed to determine the statistical characteristics of the signal.

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Detection of shaft-seal rubbing in large-scale power generation turbines with acoustic emissions. Case study

Cited by 20 publications

References 24 publications

The application of acoustic emission for detecting incipient cavitation and the best efficiency point of a 60kW centrifugal pump: case study

The application of acoustic emission for detecting incipient cavitation and the best efficiency point of a 60kW centrifugal pump: case study

Detection of incipient cavitation and determination of the best efficiency point for centrifugal pumps using acoustic emission

Method for vibro-acoustic signal processing for detection of nascent defect of mechanical assemblies

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