Browsing by Author "Hamzah, R. I. R."
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Item Open Access The influence of operating condition on acoustic emission (AE) generation during meshing of helical and spur gear(Elsevier Science B.V., Amsterdam., 2009-01-31T00:00:00Z) Hamzah, R. I. R.; Mba, DavidThe application of high-frequency acoustic emission (AE) technology to condition monitoring of gears is still in its infancy. Understanding the influence of gear operating parameters on the generation of AE is essential in applying the AE technology to gear condition monitoring. This paper presents experimental findings on the influence of speed and load in generating AE for operating helical and spur gears. The experimental findings suggest that any percentage reduction in specific film thickness (gimel), a direct consequence of a change in load condition, results in a nine- and four-fold percentage change in AE rms for the spur and helical gear sets, respectively. A numerical model representing changes in AE rms with variation in load and speed under near isothermal conditions for spur and helical gears was also established. In conclusion, it is postulated that the AE technology could offer a means of measuring in situ the effectiveness of a lubricant for operational spur and helical gears thereby establishing if the correct lubricating conditions are present to ensure optimal life usage.Item Open Access Observations of changes in acoustic emission waveform for varying seeded defect sizes in a rolling element bearing(Elsevier Science B.V., Amsterdam., 2009-01-31T00:00:00Z) Al-Dossary, Saad; Hamzah, R. I. R.; Mba, DavidThe investigation reported in this paper was centered on the application of the acoustic emissions (AE) technology for characterising the defect sizes on a radially loaded bearing. An experimental test-rig was designed such that defects of varying sizes could be seeded onto the outer and inner races of a test bearing. The aim of this investigation was to correlate defect size with specific AE parameters and to ascertain the relationship between the duration of AE transient bursts associated with seeded defects to the actual geometric size of the defect. In addition, the use of AE to detect inner race defects was explored particularly as this known to be fraught with difficulty. It is concluded that the geometric defect size of outer race defects can be determined from the AE waveform.