Dynamic Load Analysis of Motion Converter Ball Bearings in a Pericyclic Transmission

Nick J. Weinzapfel, Nathan W. Bolander, Tanmay D. Mathur, Hans DeSmidt, Edward C. Smith

Research output: Contribution to journalArticlepeer-review


Performance of ball bearings in the motion converter subassembly of an internally driven, single-speed, torque-split, twin configuration pericyclic transmission prototype is evaluated to extend the analytical knowledge base on this innovative transmission concept. A dynamic model of the transmission is developed with high-fidelity models of the installed rolling element bearings to determine their reactions. Attention is focused on the pair of ball bearings supporting the motion converter subassembly which are subjected to a complex combination of loads, including radial and axial forces, moments, carrier motion, and possibly internal preload. Then the influence of internal axial clearance and preload on the behavior of the rolling elements is analyzed with a fully dynamic ball bearing model. Provisions to consider the carrier motion and a robust integration algorithm for component orientations are presented. Finally, a microstructure-based fatigue life simulation of the critical bearing component is performed to demonstrate the effect of clearance/preload on bearing reliability.

Original languageEnglish (US)
Article number042005
JournalJournal of the American Helicopter Society
Issue number4
StatePublished - Oct 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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