Acoustic emission signals associated with damaged helical gears

Eftekharnejad, Babak; Mba, David

doi:10.1784/insi.2008.50.8.450

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…The drop in AE levels from 650 s was a direct result of the increasing viscosity and film thickness of the oil film at the mesh. Similar observations were noted by Hamzah et al 12,20 The AE r.m.s reached its minimum, approximately 0.12 V when specific film thickness was at its maximum, ¼ 9.9. The nitrogen supply was stopped when the gear temperature reached 0 C. The gearbox continued operating and as such the temperature of lubricant and metal gradually returned to their initial levels, with a corresponding increase in AE levels as the specific film thickness decreased with an increase in temperature, see region C in Figure 4.…”

Section: Test 1: Observations Of Ae Under Lubricated Conditionssupporting

confidence: 89%

Monitoring oil film regimes with acoustic emission

Hamel

Addali

David

2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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The major purpose of a gear lubricant is to provide adequate oil film thickness to reduce and prevent gear tooth surface failures. Real-time monitoring for gear failures is important in order to predict and prevent unexpected failures which would have a negative impact on the efficiency, performance and safety of the gearbox. This paper presents experimental results on the influence of specific oil film thickness on acoustic emission activity for operational helical gears. Variation in film thickness during operations was achieved by spraying liquid nitrogen onto the rotating gear wheel. The experimental results demonstrated a clear relationship between the root mean square value of the acoustic emission signal and the specific film thickness. The findings demonstrate the potential of acoustic emission technology to quantify lubrication regimes on operational gears.

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Section: Test 1: Observations Of Ae Under Lubricated Conditionssupporting

confidence: 89%

Monitoring oil film regimes with acoustic emission

Hamel

Addali

David

2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Babak and Mba [16,17] assessed the ability of AE to identifying specific defects seeded into helical (214M15) steel test gears. The gearbox test rig employed was the same back-to-back arrangement as used in [15] and operated at a speed of 11.5Hz (690 rpm).…”

Section: Acoustic Emission and Film Thicknessmentioning

confidence: 99%

Oil Regime Monitoring in Helical Gears Using Acoustic Emission

Hamel¹,

Addali²

2012

The International Conference on Applied Mechanics and Mechanica

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Gear lubrication is critically important to maintaining the integrity of operating gears, the lubricant also protects asperity contact at the gear mesh thereby protecting the gears from a deterioration process and surface failures. In this paper, the investigation was centred on the application of the acoustic emissions (AE) technology for monitoring the influence of oil film thickness variation on gear contact and characterising the oil lubrication regimes in helical gear mesh. This investigation employed a back-to-back gearbox test-rig with oil-bath lubrication. The results have demonstrated a clear relationship between AE activity, operating temperature and specific film thickness. The findings encourage the use of AE techniques to detect and quantify the lubrication regimes during gear meshing.

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“…Eftekharnejad et al [15,16] investigated AE as a means of identifying specific defects seeded onto helical test gears. It was found that the measured AE waveforms were more useful for the detection and identification of the seeded faults than the vibration signals obtained from an accelerometer attached to the bearing pedestal.…”

Section: Introductionmentioning

confidence: 99%

Employing Acoustic Emission for Monitoring Oil Film Regimes

2013

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The major purpose of a gear lubricant is to provide adequate oil film thickness to reduce and prevent gear tooth surface failures. Real time monitoring for gear failures is important in order to predict and prevent unexpected failures which would have a negative impact on the efficiency, performance and safety of the gearbox. This paper presents experimental results on the influence of specific oil film thickness on Acoustic Emission (AE) activity for operational helical gears. Variation in film thickness during operations was achieved by spraying liquid nitrogen onto the rotating gear wheel. The experimental results demonstrated a clear relationship between the root mean square (r.m.s) value of the AE signal and the specific film thickness. The findings demonstrate the potential of Acoustic Emission technology to quantify lubrication regimes on operational gears.

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Acoustic emission signals associated with damaged helical gears

Cited by 8 publications

References 17 publications

Monitoring oil film regimes with acoustic emission

Monitoring oil film regimes with acoustic emission

Oil Regime Monitoring in Helical Gears Using Acoustic Emission

Employing Acoustic Emission for Monitoring Oil Film Regimes

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