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dc.creatorVaughn, James Roy
dc.date.accessioned2012-07-30T18:08:41Z
dc.date.available2012-07-30T18:08:41Z
dc.date.created2012-05
dc.date.issued2012-07-30
dc.date.submittedMay 2012
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2012-05-4980
dc.descriptiontext
dc.description.abstractThe VCOST budgeting tool uses a drive cycle simulator to improve fuel economy predictions for vehicle fleets. This drive cycle simulator needs to predict the efficiency of various components of the vehicle's powertrain including any differentials. Existing differential efficiency models either lack accuracy over the operating conditions considered or require too great an investment. A fundamental model for differential efficiency is a cost-effective solution for predicting the odd behaviors unique to a differential. The differential efficiency model itself combines the torque balance equation and the Navier-Stokes equations with models for gear pair, bearing, and seal efficiencies under a set of appropriate assumptions. Comparison of the model with existing data has shown that observable trends in differential efficiency are reproducible in some cases to within 10% of the accepted efficiency value over a range of torques and speeds that represents the operating conditions of the differential. Though the model is generally an improvement over existing curve fits, the potential exists for further improvement to the accuracy of the model. When the model performs correctly, it represents an immense savings over collecting data with comparable accuracy.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.subjectDifferential
dc.subjectAutomotive
dc.subjectAutomobile
dc.subjectFinal drive
dc.subjectGear
dc.subjectWindage
dc.subjectBearing
dc.subjectSeal
dc.subjectVCOST
dc.subjectFuel economy
dc.subjectEfficiency
dc.subjectPowertrain
dc.subjectDrivetrain
dc.subjectPower train
dc.subjectDrive train
dc.subjectModel
dc.subjectMATLAB
dc.subjectLight-duty
dc.subjectHeavy-duty
dc.subjectDual differential
dc.subjectTandem axle
dc.subjectTag axle
dc.subjectLubricant
dc.subjectATF
dc.subjectAutomatic transmission fluid
dc.subjectSociety of Automotive Engineers
dc.subjectWalther Sutherland
dc.subjectWheel drive
dc.subjectTransaxle
dc.subjectThermal/fluid sciences
dc.subjectTFS
dc.subjectTxDOT
dc.subjectTexas Department of Transportation
dc.titleA fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy
dc.date.updated2012-07-30T18:08:51Z
dc.identifier.slug2152/ETD-UT-2012-05-4980
dc.description.departmentMechanical Engineering
dc.type.genrethesis*
thesis.degree.departmentMechanical Engineering
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorUniversity of Texas at Austin
thesis.degree.levelMasters
thesis.degree.nameMaster of Science in Engineering


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