Acoustic emission in monitoring sliding contact behaviour

Miettinen, Juha

doi:10.1016/s0301-9322(97)88618-1

Cited by 16 publications

(20 citation statements)

References 5 publications

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“…Miettinen et al [27] applied AE to monitoring sliding contact behaviour of mechanical face seals on a 15KW centrifugal pump. It was concluded that AE amplitude values of a leaking seal were on average 25% lower than in normal running conditions.…”

Section: Application Of Acoustic Emission To Seal Rubbingmentioning

confidence: 99%

“…As the low pressure cylinders were of identical size, and on the assumption that the transmission path to the receiving sensors are identical, it was observed that the strongest AE source was from 'LP2 Rear', and as such, it is highly probable that rubbing of mating surfaces at this position was at a particular stage of wear that resulted in higher AE activity than at 'LP1 Rear'. The relationship between AE levels and wear has been investigated for sliding of lubricated and dry mating surfaces [18,19,20,21,22,27]. Acoustic Emission activity was shown to be dependent on the asperity contact, surface roughness and third body interactions.…”

Section: Other Observationsmentioning

confidence: 99%

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

Cooke

Roby

Hewitt

2004

Proceedings of the Institution of Mechanical Engineers, Part A:

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Rubbing between the central rotor and the surrounding stationary components of machinery such as large-scale turbine units can escalate into severe vibration, resulting in costly damage. Although conventional vibration analysis remains an important condition monitoring technique for diagnosing such rubbing phenomena, the non-destructive measurement of Acoustic Emission (AE) activity at the bearings on such plant is evolving into a viable complementary detection approach, especially adept at indicating the early stages of shaft-seal rubbing. This paper presents a case study on the application of high frequency acoustic emissions as a means of detecting and verifying shaft-seal rubbing on a 217MVA operational steam turbine unit. The generation of AE activity is attributed to the contact, deformation, adhesion and ploughing of surface asperities on the rubbing surfaces of the rotor and stator.

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Section: Application Of Acoustic Emission To Seal Rubbingmentioning

confidence: 99%

Section: Other Observationsmentioning

confidence: 99%

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

Cooke

Roby

Hewitt

2004

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…A correlation between AE and the frictional behavior in the fluid and mixed friction regime is presented in this study. Similar to [1], a more intense acoustic emission signal along with increasing speed was recorded which the authors linked to the increased number of collisions and intensity of impulses of fluid molecules resulting from the increased shear rate.The presented literature and further references [25][26][27][28][29][30][31][32] have successfully proven the use of AE analysis in tribological context providing deeper insights into and better understanding of tribological processes. In view of this, this study aims at using AE in establishing an additional tribological parameter.…”

Section: Introductionmentioning

confidence: 99%

Expansion of the Metrological Visualization Capability by the Implementation of Acoustic Emission Analysis

Bergmann

Grün

Summer

et al. 2017

Advances in Tribology

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The acquisition and evaluation of acoustic emissions (AE) in tribology have proven to be a meaningful tool for condition monitoring and offer possibilities to deepen the understanding of tribological processes. The authors used this technology with the aim of expanding existing test methodologies towards increased visualization capability of tribological processes and investigated the correlation between tribological processes and acoustic emissions on a Ring-on-Disc and a close-to-component journal bearing test setting. The results of this study include the description of friction as well as wear processes and prove the usability of several AE evaluation parameters whereby a close correlation between AE and tribological processes can be shown. Consequently, it was possible to expand the visualization and evaluation capabilities of the test settings offering additional insights by making use of AE.

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“…Many authors have carried out work based on acoustic emission; this involves mounting an acoustic sensor on a seal and using it to listen for the sound waves generated as a result of contacting seal faces. A good example of this is work carried out by Miettinen et al [2] where acoustic emission sensors were used monitored on a face seal in a centrifugal pump. The shortfall of these techniques is that presence of background noise (unavoidable in industrial applications) makes the acoustic emission from contacting seal faces difficult to isolate.…”

Section: Introductionmentioning

confidence: 99%

A New Approach for the Measurement of Film Thickness in Liquid Face Seals

Reddyhoff

Dwyer-Joyce

Harper

2008

Tribology Transactions

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Face seals operate by allowing a small volume of the sealed fluid to escape and form a thin film between the contacting parts. The thickness of this film must be optimised to ensure the faces are separated, yet the leakage is minimised. In this work the liquid film is measured using a novel ultrasonic approach with a view to developing a condition monitoring tool. The trials were performed in two stages. Initially tests were based on a lab simulation, where it was possible to compare ultrasonic film thickness measurements with optical interference methods and capacitance methods. A direct correlation was seen between ultrasonic measurements and capacitance. Where ultrasonic and optical methods overlap, good correlation is observed, however the optical method will not record film thickness above ~0.72m. A second set of trials was carried out, where the film thickness was monitored inside a seal test apparatus. Film thickness was successfully recorded as speed and load was varied. The results showed that while stationary the film thickness varied noticeably with load. When rotating however, the oil film remained relatively stable around 2 m. During normal operation of the seal, both sudden speed and load changes were applied in order to initiate a seal failure. During these events, the measured film thickness was seen to drop dramatically down to 0.2 m. This demonstrated the ability of the technique to predict failure in a face seal and therefore its aptitude for condition monitoring.

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Acoustic emission in monitoring sliding contact behaviour

Cited by 16 publications

References 5 publications

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

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

Expansion of the Metrological Visualization Capability by the Implementation of Acoustic Emission Analysis

A New Approach for the Measurement of Film Thickness in Liquid Face Seals

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