Duplex ball bearing outer ring deformation- Simulation and experiments



Mor Battat Gideon Kogan Alex Kushnirsky Renata Klein Jacob Bortman


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 16 | PDF Downloads 57



fault modeling, swashplate, duplex ball bearings

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).
Harris, T. A., & Kotzalas, M. N. (2007). Essential Concepts of Bearing Technology (Fifth Edit).USA: CRC Press.
Taylor, I. J. & Kirkland, D. W. (2004). The Bearing Analysis Handbook, USA: VCI
Bayoumi, A., Goodman, N., Shah, R., Roebuck, T., Jarvie, A. & Eisner, L. (2008). Conditioned-Based Maintenance at USC - Part III: Aircraft Components Mapping and Testing for CBM. The American Helicopter Society Specialists' Meeting on Condition Based Maintenance. Huntsville.
Klein, R., Rudyk, E., Masad, E. (2012) “Methods for diagnostics of bearings in non-stationary environment”, International Journal of Condition Monitoring
Blechertas, V., Bayoumi, A., Goodman, N., Shah, R. & Shin, Y. J., (2009). CBM Fundamental Research at the University of South Carolina: A Systematic Approach to U.S. Army Rotorcraft CBM and the Resulting Tangible Benefits. The American Helicopter Society Technical Specialists’ Meeting on Condition Based Maintenance. Huntsville.
Dempsey, P., Branning, J. & Arsenal, R. (2010). Comparison of Test Stand and Helicopter Oil Cooler Bearing Condition Indicators. AHS 66th Annual Forum and Technology.
Budynas, R. & Nisbett, K. (2006). Shigley's Mechanical Engineering Design (Mcgraw-Hill Series in Mechanical Engineering). McGraw-Hill Science/Engineering/Math.
Technical Papers