Staff publications (SoE)

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Browsing Staff publications (SoE) by Subject "Acoustic Emission"

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    The application of spectral kurtosis on Acoustic Emission and vibrations from a defective bearing
    (Elsevier, 2011-01-31) Eftekharnejad, Babak; Carrasco, M. R.; Charnley, B.; Mba, David
    The application of Acoustic Emission (AE) technology for machine health monitoring is gaining ground as power tool for health diagnostic of rolling element bearing. This paper provides an investigation that compares the applicability of AE and vibration technologies in monitoring a naturally degraded roller bearing. This research is the first known attempt investigating the comparative effectiveness of applying the Kurtogram to both vibration and AE data from a defective bearing.
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    Diagnostics and prognostics with acoustic emission, vibration and spectrometric oil analysis for spur gears; a comparative study
    (Learned and Professional Society Publishers, 2005-08-01T00:00:00Z) Tan, Chee Keong; Irving, Phil E.; Mba, David
    Whilst vibration and spectrometric oil analysis for gear fault diagnosis are well established, the application of AE to this field is still in its infancy. This paper describes an experimental investigation on spur gears in which natural pitting was allowed to occur. Throughout the test period, AE, vibration and spectrometric oil samples were monitored continuously in order to correlate and compare these techniques to natural life degradation of the gears. It was observed that the AE technique was the most sensitive in detecting and monitoring pitting.
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    An initial investigation on the potential applicability of Acoustic Emission to rail track fault detection.
    (Elsevier Science B.V., Amsterdam., 2004-10-01T00:00:00Z) Bruzelius, Kristoffer; Mba, David
    In light of recent accidents in the rail industry, the assessment of the mechanical integrity of rail-track is of vital importance. This encompasses the integrity of the track due to rolling contact fatigue and surface wear. Whilst numerous techniques are employed for crack detection, several defects have clearly been missed. In Europe, more than 100 rails are broken each year and rail maintenance costs within the European Union is estimated at 300-million Euros annually [Inst Mech Engrs 216 (2001) 249]. The derailment of a train at Hatfield in October 2000 is a tragic example of a fractured rail going undetected. This paper presents an experimental study on the applicability of Acoustic Emissions (AE) for rail-track defect diagnosis. An experimental test- rig was employed for this programme. This allowed for a surface defect to be seeded onto the test-rig. The investigation presented is part of an on-going attempt to develop the non-destructive technique of AE for assessing the surface integrity of rail-track. The AE technique is not new but the application in this particular instance is unique. It is concluded that the AE technique offers a complementary tool for rail track defect detection.