Bearing Envelope Analysis Window Selection
Bearing envelope analysis (BEA) is a powerful technique in the detection of faults in bearings. The improper selection of the envelope window frequency and window bandwidth can render the analysis ineffective. This can reduce the ability of a health and usage monitoring system (HUMS) to correctly identify a degraded bearing. This occurred recently: a teardown analysis (TDA) of a utility helicopter oil cooler fan housing found extensive bearing damage. The HUMS did not detect the fault. This paper is an analysis of why the BEA failed to detect the damage bearing. A description of the BEA is given. Using raw data that was collected prior to the TDA, various windows where tested on the BEA, a measure of effectiveness for BEA window selection was developed, and a window is suggested that would have detected the bearing fault is given.
How to Cite
bearings, diagnostic performance, helicopters, applications: helicopter
(Kellar, 2005) Kellar, J., Grabill, P., “Inserted Fault Vibration Monitoring Tests for a CH-47D Aft Swashplate Bearing,” AHS 61st Annual Forum, 2005.
(Bechhoefer, 2007) Bechhoefer, E., He, D., “Bearing Damage Condition Indicator Correlation,” Center for Rotorcraft Innovation Project: 07-B-6-59-S2.1
(Bechhoefer, 2007) Bechhoefer, E., “Data Analysis Trade Study of the CH-47D Swash Plate Bearing,” E-5823, Goodrich SIS, 2007.
(Bechhoefer, 2007) Bechhoefer, E., “Analysis of CH53E Tail Rotor Hanger Bearings”, E-5581, Goodrich SIS, 2007
(Bechhoefer, 2007) Bechhoefer, E., “Analysis of CH53E Oil Cooler Bearing Accelerometer Location and Condition Indicator Development,” SIS
(Ganeriawala 2006) Ganeriawala, S., “Some Observation of the Detection of Rolling Element Bearing Outer Race Faults,” SpectraQuest,www.spectraquest.com September, 2006
(Bechhoefer and Mayhew 2006) Bechhoefer, E., Mayhew, E., “Mechanical Diagnostics System Engineering in IMD-HUMS,” IEEE Aerospace Conference, Big Sky, 2006.
(Bechhoefer and Berhnard 2007) Bechhoefer, E., Berhnard, A., “A Generalized Threshold Setting Process for HUMS”, IEEE Aerospace Conference, Big Sky, 2007.
(Bechhoefer, 2008) Bechhoefer, E., “A Method of Generalized Prognostics of a Component Using Paris Law,” AHS 64 Annual Forum, 2008.
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