Acoustic emission of rolling bearings lubricated with contaminated grease

Miettinen, Juha; Andersson, Peter

doi:10.1016/s0301-679x(00)00124-9

Cited by 94 publications

(50 citation statements)

References 4 publications

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“…The acoustic emission technique has also been employed by Miettinen et al [17] to monitor the lubricant condition in rolling element bearing. And successful applications of AE to bearing diagnosis for extremely slow rotational speeds have been reported [18,19].…”

Section: Acoustic Emission and Bearing Defect Diagnosismentioning

confidence: 99%

Bearing defect diagnosis and acoustic emission

Morhain

Mba

2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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Acoustic emission (AE) was originally developed for non-destructive testing of static structures, however, over the years its application has been extended to health monitoring of rotating machines and bearings. It offers the advantage of earlier defect detection in comparison to vibration analysis. However, limitations in the successful application of AE technique for monitoring bearings have been partly due to the difficulty in processing, interpreting and classifying the acquired data.The investigation reported in this paper was centered on the application of standard acoustic emissions (AE) characteristic parameters on a radially loaded bearing. An experimental test-rig was modified such that defects could be seeded onto the inner and outer races of a test bearing. As the test-rig was adapted for this purpose it offered high background acoustic emission noise providing a realistic test for fault diagnosis.In addition to a review of current diagnostic methods for applying AE to bearing diagnosis, the results of this investigation validated the use of r.m.s, amplitude, energy and AE counts for diagnosis. Furthermore, this study determined the most appropriate threshold level for AE count diagnosis, the first known attempt.

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Section: Acoustic Emission and Bearing Defect Diagnosismentioning

confidence: 99%

Bearing defect diagnosis and acoustic emission

Morhain

Mba

2003

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…This technique has been proven in the separation of failure modes [2], the monitoring of wear [4,21], the specification of contaminated systems [16,20] and to differentiate lubricants [17] and lubrication regimes [7]. However, most of the investigations use simple signal processing methods such as root mean square (RMS) [7,20] and activation counts (AC) [2,16,17,21]. All these investigations use relative measurement methods, and signals are acquired using piezoelectric transducers, which limits investigations without further calibration to measure relatively.…”

Section: Introductionmentioning

confidence: 99%

Absolute Measurement of Elastic Waves Excited by Hertzian Contacts in Boundary Restricted Systems

et al. 2016

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In most applied monitoring investigations using acoustic emission, measurements are carried out relatively, even though that limits the use of the extracted information. The authors believe acoustic emission monitoring can be improved by instead using absolute measurements. However, knowledge about absolute measurement in boundary restricted systems is limited. This article evaluates a method for absolute calibration of acoustic emission transducers and evaluates its performance in a boundary restricted system. Absolute measured signals of Hertzian contact excited elastic waves in boundary restricted systems were studied with respect to contact time and excitation energy. Good agreement is shown between measured and calculated signals. For contact times short enough to avoid interaction between elastic waves and initiating forces, the signals contain both resonances and zero frequencies, whereas for longer contact times the signals exclusively contained resonances. For both cases, aGreen's function model and measured signals showed good agreement.

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“…Signals from contaminated bearings were in these studies successfully correlated to type [1,2], size [1][2][3] and concentration [1,2] of particle contamination. In addition, the type of lubricant [4][5][6] and the lubrication absence [7] in both contaminated and uncontaminated cases were correlated with signals monitored by acoustic emission transducers.…”

mentioning

confidence: 88%

Elastic Waves of a Single Elasto-Hydrodynamically Lubricated Contact

2016

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Elastic waves are widely used for condition monitoring of rolling element bearings through vibration or acoustic emission measurements. While vibration signals are understood to a high degree due to many scientific investigations as well as a long history of usage in the field, acoustic emission signals of rolling element bearings are poorly understood. Therefore, this investigation presents simulation studies and measurements of a single elastohydrodynamically lubricated (EHL) contact. In this investigation the EHL contact is a ball bouncing on a lubricated plate. The simulation based on Green's function and the measurements based on a accelerometer to some extent agree. A shift of zero frequencies towards higher frequencies when compared to Hertzian reference measurements was determined for an infinite plate setup. Taking boundary restrictions into account, elastic waves of a Hertzian contact and an EHL contact only differ by a damping of higher resonances which is most likely caused by the EHL film.

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Acoustic emission of rolling bearings lubricated with contaminated grease

Cited by 94 publications

References 4 publications

Bearing defect diagnosis and acoustic emission

Bearing defect diagnosis and acoustic emission

Absolute Measurement of Elastic Waves Excited by Hertzian Contacts in Boundary Restricted Systems

Elastic Waves of a Single Elasto-Hydrodynamically Lubricated Contact

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