Condition based monitoring of gearbox transmission elements in a spur gear cutter bar.
2010-08
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Condition based monitoring of gearbox transmission elements in a spur gear cutter bar.
Authors
Published Date
2010-08
Publisher
Type
Thesis or Dissertation
Abstract
This research investigated bearing failures in a spur gear cutter bar used in the
agricultural equipment sector for cutting forage crops. The cutter bar is under
consideration by Case-New Holland (CNH) for use in their equipment. The primary
focus of this investigation was to develop and test a real time monitoring system to
monitor the health of the bearings during operation and alert the operator of the location
of a pending bearing failure. This system uses temperature as the monitoring parameter
and does not estimate the remaining useful life after the initial failure mode has been
detected. The temperature profile of interest is that just before catastrophic failure and
based on that is used to alert the operator.
Causes of bearing failure within the cutter bar are also investigated theoretically
to determine the effect that they would have on bearing life. Both cutter bar bending and
bearing misalignment were analyzed from a theoretical perspective. Bending of the
cutter bar was determined to not have a detrimental effect on the contact stresses within
the bearings and thus no shortening of bearing life. Bearing alignment is a critical factor
in bearing condition as excessive misalignment creates high contact stresses reducing the
useful life. The gear train and bearings are retained between two steel halves creating a
case, and to prevent excessive misalignment the case halves cannot shift by more than
0.47 ±0.04 mm relative to the vertical axis of each bearing mount.
Additional testing determined that operating the cutter bar on a hill has no effect on bearing life and that oil temperature can be used to monitor the correct amount of oil in the cutter bar.
Description
University of Minnesota M.S. thesis. August 2010. Major: Biosystems and agricultural Engineering. Advisor: Dr. Jonathan Chaplin. 1 computer file (PDF); xiv, 189 pages, appendices A-C. Ill. (some col.)
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
Pommeranz, Garrett Vernon. (2010). Condition based monitoring of gearbox transmission elements in a spur gear cutter bar.. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/102453.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.