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

Repository

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

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