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dc.contributor.advisorMatthews, Ronald D.en
dc.creatorVaughn, James Royen
dc.date.accessioned2012-07-30T18:08:41Zen
dc.date.available2012-07-30T18:08:41Zen
dc.date.created2012-05en
dc.date.issued2012-07-30en
dc.date.submittedMay 2012en
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2012-05-4980en
dc.descriptiontexten
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.en
dc.format.mimetypeapplication/pdfen
dc.language.isoengen
dc.subjectDifferentialen
dc.subjectAutomotiveen
dc.subjectAutomobileen
dc.subjectFinal driveen
dc.subjectGearen
dc.subjectWindageen
dc.subjectBearingen
dc.subjectSealen
dc.subjectVCOSTen
dc.subjectFuel economyen
dc.subjectEfficiencyen
dc.subjectPowertrainen
dc.subjectDrivetrainen
dc.subjectPower trainen
dc.subjectDrive trainen
dc.subjectModelen
dc.subjectMATLABen
dc.subjectLight-dutyen
dc.subjectHeavy-dutyen
dc.subjectDual differentialen
dc.subjectTandem axleen
dc.subjectTag axleen
dc.subjectLubricanten
dc.subjectATFen
dc.subjectAutomatic transmission fluiden
dc.subjectSociety of Automotive Engineersen
dc.subjectWalther Sutherlanden
dc.subjectWheel driveen
dc.subjectTransaxleen
dc.subjectThermal/fluid sciencesen
dc.subjectTFSen
dc.subjectTxDOTen
dc.subjectTexas Department of Transportationen
dc.titleA fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energyen
dc.date.updated2012-07-30T18:08:51Zen
dc.identifier.slug2152/ETD-UT-2012-05-4980en
dc.contributor.committeeMemberBryant, Michael D.en
dc.description.departmentMechanical Engineeringen
dc.type.genrethesisen
thesis.degree.departmentMechanical Engineeringen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorUniversity of Texas at Austinen
thesis.degree.levelMastersen
thesis.degree.nameMaster of Science in Engineeringen


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