Duplex ball bearing outer ring deformation - Simulation and experiments

Mor Battat, Gideon Kogan, Alex Kushnirsky, Renata Klein, and Jacob Bortman
Submission Type: 
Full Paper
phmce_14_006.pdf757.88 KBMay 26, 2014 - 8:57am

This paper presents a research of deformations influence on duplex ball bearings dynamic behavior. Despite the common use in duplex ball bearings, bearings sub-components deformations are not thoroughly investigated. In order to investigate these effects, this study integrates the outcome of a 3D dynamic model, developed for assessment of the defect pattern and experimental results a full scale CH-53 Swashplate test rig.
The ability to withstand high radial and bi-directional axial loads makes duplex bearings common in aircraft applications and specifically in helicopter rotors. The swashplate of the CH-53 is constructed of duplex angular contact ball bearings. Two spacers, internal and external support the bearing rings. A structural defect is formed by a faulty external spacer, thus causing a lack of support to the top bearing and deformation of the outer rings.
Model results indicate that the lack of support has a defect pattern in both radial and axial directions. Test rig data acquired by accelerometers was analyzed by several diagnostic techniques including order tracking and envelope analysis in order to recognize the simulated pattern.

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Submission Keywords: 
duplex ball bearings
fault modeling
Submission Topic Areas: 
Modeling and simulation
Structural health monitoring
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