Session: PTG-03-01: Gear Dynamics and Noise 1

Paper Number: 117076

117076 - An Experimental Investigation of the Effects of Lubrication on Rattling Motions and Noise of a Gear Pair 

Vibro-impacts are observed commonly in various automotive power transmission applications. Vibro-impacts lead to excessive noise issues known as rattling. Input or output toque fluctuations cause gear teeth to separate and commit to complex sequences of drive and coast-side impacts spanning the entire backlash zone. Several recent experimental and theoretical studies characterized the underlying nonlinear structure of the rattling behavior of gear systems, ignoring any influences of lubrication conditions. Those rattle models with no lubricant provisions were shown to compare well with the dry contact measurements. This experimental study aims at complementing these earlier studies providing acoustics and torsional vibration measurements from a single gear pair excited by input torque fluctuations as it operates dry, jet-lubricated and dip-lubricated conditions. In this study, rattle test machine equipped with a lubrication system will be presented. Vibro-impact measurements along with corresponding sound pressure measurements will be provided for a wide range of operating and different lubrication conditions.  Direct comparisons of both acoustic and torsional vibration data under different lubrication conditions will be provided in order to bring insights into the influence of lubrication on the resultant rattle behavior. Presented results with dry, dip and jet lubrication showed that lubricant provides some additional damping in the process reducing the noise level to a certain extent while overall vibro-impact behavior remains intact.

Presenting Author: Ata Donmez The Ohio State University

Presenting Author Biography: Dr. Ata Donmez is a Post Doctoral Researcher at the Gear and Power Transmission Laboratory (GearLab) within the Department of Mechanical and Aerospace Engineering at the Ohio State University. He has received his B.Sc. and M.Sc. degrees both in Mechanical Engineering from Middle East Technical University, Turkiye. During his MS studies, he worked as a research engineer, taking responsibilities in the motion and vibration control systems. He received his Ph.D from Ohio State in 2022, studying nonlinear dynamics of geared systems and gear noise. His current research interest lies in nonlinear dynamics of mechanical systems with clearance and dry-friction type non-smooth nonlinearities and related experimental methodologies.

Authors:

Ata Donmez The Ohio State University
Ahmet Kahraman The Ohio State University
Michael Handschuh The Ohio State University
Michael O'toole The Ohio State University