A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy

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A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy

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dc.contributor.advisor Matthews, Ronald D.
dc.creator Vaughn, James Roy
dc.date.accessioned 2012-07-30T18:08:41Z
dc.date.available 2012-07-30T18:08:41Z
dc.date.created 2012-05
dc.date.issued 2012-07-30
dc.date.submitted May 2012
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2012-05-4980
dc.description.abstract The 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.mimetype application/pdf
dc.language.iso eng
dc.subject Differential
dc.subject Automotive
dc.subject Automobile
dc.subject Final drive
dc.subject Gear
dc.subject Windage
dc.subject Bearing
dc.subject Seal
dc.subject VCOST
dc.subject Fuel economy
dc.subject Efficiency
dc.subject Powertrain
dc.subject Drivetrain
dc.subject Power train
dc.subject Drive train
dc.subject Model
dc.subject MATLAB
dc.subject Light-duty
dc.subject Heavy-duty
dc.subject Dual differential
dc.subject Tandem axle
dc.subject Tag axle
dc.subject Lubricant
dc.subject ATF
dc.subject Automatic transmission fluid
dc.subject Society of Automotive Engineers
dc.subject Walther Sutherland
dc.subject Wheel drive
dc.subject Transaxle
dc.subject Thermal/fluid sciences
dc.subject TFS
dc.subject TxDOT
dc.subject Texas Department of Transportation
dc.title A fundamental approximation in MATLAB of the efficiency of an automotive differential in transmitting rotational kinetic energy
dc.date.updated 2012-07-30T18:08:51Z
dc.identifier.slug 2152/ETD-UT-2012-05-4980
dc.contributor.committeeMember Bryant, Michael D.
dc.description.department Mechanical Engineering
dc.type.genre thesis
dc.type.material text
thesis.degree.department Mechanical Engineering
thesis.degree.discipline Mechanical Engineering
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Masters
thesis.degree.name Master of Science in Engineering

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