Duplex ball bearing outer ring deformation- Simulation and experiments

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Published Jul 8, 2014
DOI https://doi.org/10.36001/phme.2014.v2i1.1472
Mor Battat
Pearlstone Center for Aeronautical Engineering Studies and Laboratory for Mechanical Health Monitoring, Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
Gideon Kogan
Pearlstone Center for Aeronautical Engineering Studies and Laboratory for Mechanical Health Monitoring, Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
Alex Kushnirsky
Pearlstone Center for Aeronautical Engineering Studies and Laboratory for Mechanical Health Monitoring, Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
Renata Klein
R.K. Diagnostics, P.O.Box 101, Gilon, D. N. Misgav 20103, Israel
Jacob Bortman

Abstract

This paper presents a research of deformations influence on duplex ball bearings dynamic behavior. Despite the common use of duplex ball bearings, bearings subcomponents 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 from 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 between the static inner rings and external, between the rotating outer rings 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, envelope analysis and dephased algorithm in order to recognize the simulated pattern.

How to Cite

Battat, M., Kogan, G., Kushnirsky, A., Klein, R., & Bortman, J. (2014). Duplex ball bearing outer ring deformation- Simulation and experiments. PHM Society European Conference, 2(1). https://doi.org/10.36001/phme.2014.v2i1.1472
Abstract 141 | PDF Downloads 277

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Keywords

fault modeling, swashplate, duplex ball bearings

References
Battat, M., Kogan, G., Kushnirsky, A., Klein, R., & Bortman, J. (2013). Detection of CH-53 swashplate bearing deformation-from a 3D dynamic model to diagnostics. Proceedings of PHM Conference. October 7-14, New Orleans, LA
Kogan, G., Bortman, J., Kushnirsky, A. & Klein, R. (2012). Ball bearing modeling for faults simulation. The Ninth International Conference on Condition Monitoring and Machinery Failure Prevention Technologies (no. 1, pp. 1–8).
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Issue
Vol. 2 No. 1 (2014): Proceedings of the European Conference of the PHM Society 2014
Section
Technical Papers

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