Development of a measurement solution for wet friction materials simulating car testing
(2023) MVKM01 20222Department of Energy Sciences
- Abstract
- BorgWarner continuously improves the performance of their friction system,
and by that also need more sophisticated measurement methods. The friction system is developed to minimize noises caused by vibrations to improve
customer satisfaction. However, studies from BorgWarner show that in some
specific drivetrain operations, vibrations can be induced from the friction
discs (lamellas) caused by stick-slip and/or shudder, resulting in undesired
behaviour.
This undesired behaviour has previously not been seen in a test rig environment and has only been detected during car testing. This master thesis focus
on replicating the undesired behaviour from car testing in one of BorgWarners’ test rigs. This would enable BorgWarner to... (More) - BorgWarner continuously improves the performance of their friction system,
and by that also need more sophisticated measurement methods. The friction system is developed to minimize noises caused by vibrations to improve
customer satisfaction. However, studies from BorgWarner show that in some
specific drivetrain operations, vibrations can be induced from the friction
discs (lamellas) caused by stick-slip and/or shudder, resulting in undesired
behaviour.
This undesired behaviour has previously not been seen in a test rig environment and has only been detected during car testing. This master thesis focus
on replicating the undesired behaviour from car testing in one of BorgWarners’ test rigs. This would enable BorgWarner to simulate a real scenario in
a test rig environment. By detecting the undesired behaviour in the test rig,
BorgWarner can further test and develop its friction system without the need
for car testing.
The master thesis focuses on introducing elasticity in the test rig by integrat-
ing a solution with a new shaft with lower stiffness. The rig’s components
were arranged in two different setups where the shaft was either connected
with a fixed side of the rig or a rotating side.
Vibrations were detected when lower stiffness was introduced and the shaft
was connected to the rotating side of the rig. Like the car tests, vibrations
were only induced during a short period, the so-called run-in phase. However,
the period was shorter for the test rig. The test rig result with the new shaft
show that the vibrations seen in the car testing could be reproduced in the rig,
showing the solutions’ potential. Therefore, this master thesis recommends
BorgWarner to test the solution further and produce more test data to verify
the replicability. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9130449
- author
- Koefoed, Johan LU
- supervisor
- organization
- course
- MVKM01 20222
- year
- 2023
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Lamella, wet clutch, stick-slip, natural frequency
- report number
- LUTMDN/TMHP-23/5530-SE
- ISSN
- 0282-1990
- language
- English
- id
- 9130449
- date added to LUP
- 2023-06-27 08:35:21
- date last changed
- 2023-06-27 08:35:21
@misc{9130449,
abstract = {{BorgWarner continuously improves the performance of their friction system,
and by that also need more sophisticated measurement methods. The friction system is developed to minimize noises caused by vibrations to improve
customer satisfaction. However, studies from BorgWarner show that in some
specific drivetrain operations, vibrations can be induced from the friction
discs (lamellas) caused by stick-slip and/or shudder, resulting in undesired
behaviour.
This undesired behaviour has previously not been seen in a test rig environment and has only been detected during car testing. This master thesis focus
on replicating the undesired behaviour from car testing in one of BorgWarners’ test rigs. This would enable BorgWarner to simulate a real scenario in
a test rig environment. By detecting the undesired behaviour in the test rig,
BorgWarner can further test and develop its friction system without the need
for car testing.
The master thesis focuses on introducing elasticity in the test rig by integrat-
ing a solution with a new shaft with lower stiffness. The rig’s components
were arranged in two different setups where the shaft was either connected
with a fixed side of the rig or a rotating side.
Vibrations were detected when lower stiffness was introduced and the shaft
was connected to the rotating side of the rig. Like the car tests, vibrations
were only induced during a short period, the so-called run-in phase. However,
the period was shorter for the test rig. The test rig result with the new shaft
show that the vibrations seen in the car testing could be reproduced in the rig,
showing the solutions’ potential. Therefore, this master thesis recommends
BorgWarner to test the solution further and produce more test data to verify
the replicability.}},
author = {{Koefoed, Johan}},
issn = {{0282-1990}},
language = {{eng}},
note = {{Student Paper}},
title = {{Development of a measurement solution for wet friction materials simulating car testing}},
year = {{2023}},
}