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Monday, July 8 • 14:00 - 15:00
Plenary 2: Unique Vibration Phenomena in High-Speed, Lightweight, Compliant Gears

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Gears have recently been aggressively adopted in large aircraft engines because they improve turbine and fan blade efficiency by better matching the optimal speeds of the associated shafts. The high operating speeds and extreme focus on weight reduction lead to gear vibration behaviors that are distinct from conventional gears. High speeds give high excitation frequencies, and lightweight, thin-walled gears have lower natural frequencies. This combination triggers resonance, gyroscopic effects, nonlinearity, vibration of the gears as elastically compliant bodies, and parametric instability. These behaviors are driving development of new models and analysis tools different than what is typical for conventional gears. This presentation will start with industrial examples motivating the work. Next, we describe modeling and analysis of gear vibration using analytical and finite element/contact mechanics methods, with special attention to planetary gears because they are the de facto standard in aerospace applications and because of their interesting dynamics arising from cyclic symmetry. These models, and their experimental validations, will be used to illustrate and explain, without emphasis on mathematical details, the unique vibration behaviors that occur and how the analytical/computational findings have powerful practical implications.

NOTE: The live recording of this keynote is now available on YouTube.

avatar for Robert Parker

Robert Parker

LS Randolph Professor, Virginia Tech
From 2012 Prof. Parker is the L. S. Randolph Professor in the Department of Mechanical Engineering at Virginia Tech, where he also served as Department Head. Previously he was a University Distinguished Professor and the Executive Dean at the University of Michigan-Shanghai Jiao Tong... Read More →

Monday July 8, 2019 14:00 - 15:00 EDT
Montreal Ballroom