Dynamic Friction Characterization of Tripod Constant Velocity (Cv) Joints: Experiments, Analysis and Modeling
Lee, Chul Hee
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/83845
Description
Title
Dynamic Friction Characterization of Tripod Constant Velocity (Cv) Joints: Experiments, Analysis and Modeling
Author(s)
Lee, Chul Hee
Issue Date
2006
Doctoral Committee Chair(s)
Polycarpou, Andreas A.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Automotive
Language
eng
Abstract
The main goal of this thesis is to develop a physics-based internal friction model of tripod CV joints that can be readily applied during new vehicle development. This model will replace current practices of using empirical fixed friction coefficient values. In order to achieve this goal, a prototype well-instrumented CV joint friction apparatus was designed, built and successfully used to measure the internal friction behavior of actual CV joints. The apparatus is capable of measuring a key performance parameter of friction under different realistic vehicle operating conditions of stroke speeds, CV joint articulation angles and torque variations. The validity of the experimental measurements was confirmed through FE analysis. Also, the validity of Hertzian contact analysis in a CV joint was assessed using the FE method, and found that the Hertzian solutions are practically applicable under low contacting load. These contact results were incorporated in the friction model. Subsequently the friction behavior in CV joints in terms of sliding and rolling friction was investigated by measuring the slip to roll ratio, pure sliding friction coefficient, and also by comparing these results with an elastic-plastic static friction, and rolling friction models. These measurement results and essential friction parameters were subsequently incorporated in the proposed CV joint total friction model, which includes both static and dynamic friction terms. Using the physics-based dynamic friction model, we also developed a model for the Generated-Axial-Force (GAF), which is a practical design variable as is the undesirable force that is seen at a vehicles wheel shaft. The validity of the proposed GAF model was then shown through direct comparison to actual experimental measurements. Finally, using the proposed friction and GAF models, design guidelines in terms of CV joint friction performance were suggested.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
