Helicopter Main Gearbox Bearing Defect Identification with Acoustic Emission Techniques
Duan, F, Elasha, F, Mba, D and Bennett, I (2016). Helicopter Main Gearbox Bearing Defect Identification with Acoustic Emission Techniques. IEEE International Conference on Prognostics and Health Management. Ottawa, Canada 20 - 22 Jun 2016 London South Bank University.
|Authors||Duan, F, Elasha, F, Mba, D and Bennett, I|
Helicopter transmission integrity is critical to the safety operation. Among all mechanical failures in helicopter transmission, the main gearbox (MGB) failures occupy approximately 16%. Great effort has been paid in early prevention and diagnosis of MGB failures. As a commonly mployed monitoring technology, vibration analysis suffers from strong background noise due to variable transmission paths from the bearing to the receiving externally mounted vibration sensor. The background noise can mask the signal signature of interest. This paper reports on an investigation to identify the presence of a bearing defect in a CS29 Category ‘A’ helicopter main gearbox with acoustic emission (AE) technologies. This investigation involved performing the tests for faultfree condition, minor bearing damage and major bearing damage conditions under different power levels. The bearing faults were seeded on one of the planet gears of the second epicyclic stage. To overcome the issue of low signal to noise ratio (SNR), AE sensor was directly attached on the dish of planet carrier. The AE signal was transferred wireless to avoid complex wiring inside MGB. The analysis results proved the feasibility of using AE ensor as in-situ bearing defect identification.
|Keywords||Helicopter main gearbox; acoustic emission; bearing defect diagnostics|
|Publisher||London South Bank University|
|Accepted author manuscript|
CC BY-NC-ND 4.0
|22 Jun 2016|
|Publication process dates|
|Deposited||25 Aug 2016|
|Accepted||15 May 2016|
|Funder||European Aviation Safety Agency (EASA)|
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