Dual-Impulse Response Model for the Acoustic Emission Produced by a Spall and the Size Evaluation in Rolling Element Bearings

Spalling of the races or rolling elements is one of the most common faults in rolling element bearings. Exact estimation of the spall size is helpful to the life prediction for rolling element bearings. In this paper, the dual-impulsive phenomenon in the response of a spalled rolling element bearing is investigated experimentally, where the acoustic emission signals are utilized. A new method is proposed to estimate the spall size by extracting the envelope of harmonics of the ball passing frequency on the outer race from the squared envelope spectrum. Compared with the cepstrum analysis, the proposed procedure shows more powerful anti-noise ability in the fault size evaluation.

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Experimental investigation on time-domain features in the diagnosis of rolling element bearings by acoustic emission

Journal of Vibration and Control ◽

10.1177/10775463211016130 ◽

2021 ◽

pp. 107754632110161

Author(s):

Aref Aasi ◽

Ramtin Tabatabaei ◽

Erfan Aasi ◽

Seyed Mohammad Jafari

Keyword(s):

Acoustic Emission ◽

Condition Monitoring ◽

Time Domain ◽

Central Moment ◽

Rolling Element Bearings ◽

Test Rig ◽

Acoustic Emission Sensor ◽

Outer Race ◽

Common Time ◽

Rolling Element

Inspired by previous achievements, different time-domain features for diagnosis of rolling element bearings are investigated in this study. An experimental test rig is prepared for condition monitoring of angular contact bearing by using an acoustic emission sensor for this purpose. The acoustic emission signals are acquired from defective bearing, and the sensor takes signals from defects on the inner or outer race of the bearing. By studying the literature works, different domains of features are classified, and the most common time-domain features are selected for condition monitoring. The considered features are calculated for obtained signals with different loadings, speeds, and sizes of defects on the inner and outer race of the bearing. Our results indicate that the clearance, sixth central moment, impulse, kurtosis, and crest factors are appropriate features for diagnosis purposes. Moreover, our results show that the clearance factor for small defects and sixth central moment for large defects are promising for defect diagnosis on rolling element bearings.

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Simultaneous Monitoring of Rolling-Element and Journal Bearings Using Analysis of Structure-Born Ultrasound Acoustic Emissions

Volume 13: Sound, Vibration and Design ◽

10.1115/imece2010-39814 ◽

2010 ◽

Cited By ~ 1

Author(s):

A. Albers ◽

M. Dickerhof

Keyword(s):

Acoustic Emission ◽

Acoustic Emissions ◽

Piezoelectric Sensor ◽

Journal Bearings ◽

Rolling Element Bearings ◽

Acoustic Emission Sensor ◽

Outer Race ◽

Rolling Element ◽

Characteristic Values ◽

Acoustic Emission Technology

The application of Acoustic Emission technology for monitoring rolling element or hydrodynamic plain bearings has been addressed by several authors in former times. Most of these investigations took place under idealized conditions, to allow the concentration on one single source of emission, typically recorded by means of a piezoelectric sensor. This can be achieved by either eliminating other sources in advance or taking measures to shield them out (e. g. by placing the acoustic emission sensor very close to the source of interest), so that in consequence only one source of structure-born sound is present in the signal. With a practical orientation this is often not possible. In point of fact, a multitude of potential sources of emission can be worth considering, unfortunately superimposing one another. The investigations reported in this paper are therefore focused on the simultaneous monitoring of both bearing types mentioned above. Only one piezoelectric acoustic emission sensor is utilized, which is placed rather far away from the monitored bearings. By derivation of characteristic values from the sensor signal, different simulated defects can be detected reliably: seeded defects in the inner and outer race of rolling element bearings as well as the occurrence of mixed friction in the sliding surface bearing due to interrupted lubricant inflow.

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Acoustic emission monitoring of rolling element bearings

10.1109/ultsym.1988.49503 ◽

2003 ◽

Cited By ~ 14

Author(s):

M.W. Hawman ◽

W.S. Galinaitis

Keyword(s):

Acoustic Emission ◽

Rolling Element Bearings ◽

Acoustic Emission Monitoring ◽

Emission Monitoring ◽

Rolling Element

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Detection of Incipient Damage in Large Rolling Element Bearings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.13-14.37 ◽

2006 ◽

Vol 13-14 ◽

pp. 37-44 ◽

Cited By ~ 5

Author(s):

Leonard M. Rogers

Keyword(s):

Acoustic Emission ◽

The Body ◽

Metal Loss ◽

Rolling Element Bearings ◽

Variable Speed ◽

Fluid Turbulence ◽

Rolling Element ◽

Acoustic Emission Source ◽

Reliable Detection ◽

True Condition

The paper describes a methodology for the reliable detection of incipient damage due to fatigue, fretting and false brinelling in large, heavily loaded rolling element bearings such as found in pedestal slewing cranes and ship azi-pod propulsors. It has been found that combining acoustic emission source location and spectrum analysis of the associated time-domain signatures has produced a powerful diagnostic tool for the detection of micro-damage to the various working faces of the bearing under variable speed and loading conditions, before any metal loss is evident in the bearing lubricant. Other sources of acoustic emission such as fretting at contact faces elsewhere in the body of the bearing and fluid turbulence can be resolved and quantified so as not to interfere with the diagnosis of bearing condition. Results are presented for new and damaged bearings, where the true condition has been verified when the bearings were subsequently replaced.

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