Developing Drivetrain Robustness for Small Engine Testing FEV Incorporated

Format:

Conference/Event

Author/Creator:

Tatur, Tatur, author.

Contributor:

Jackson, Thomas

Sonntag, Hans-Dieter

Tomazic, Dean

Wiehagen, Norbert

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

The increased demand in fuel economy and the reduction of CO₂emissions results in continued efforts to downsize engines. Thedownsizing efforts result in engines with lower displacement aswell as lower number of cylinders. In addition to cylinder anddisplacement downsizing the development community embarks oncontinued efforts toward down-speeding. The combination of theaforementioned factors results in engines which can have highlevels of torsional vibrations. Such behavior can have detrimentaleffects on the drivetrain particularly during the development phaseof these. Driveshafts, couplings, and dynamometers are exposed tothese torsional forces and depending on their frequency costlydamages in these components can occur.To account for these effects, FEV employs a multi-body-systemmodeling approach through which base engine information is used todetermine optimized drivetrain setups. All mechanical elements inthe setup are analyzed based on their torsional behavior. Bendingand axial vibration are considered in the analysis as well. Duringthe early stages of engine development, very little information isavailable to ensure proper drivetrain layout. To ensure highestpossible usefulness of the modeling tool, the developed algorithmscan function with very limited input data. The moments of inertia,stiffness, and dampening of the five major groups - crankshaft,piston assembly, flywheel, driveshaft, dynamometer - are requiredto ensure successful processing. A large database with knowncomponents can support the process in case precise target data isnot available. Cylinder pressure information allows to furtherincrease the accuracy of the results. All available information isprocessed and the natural frequencies and Eigen modes aredetermined. This basis allows further optimization of thedrivetrain through modifications of the critical parameters offlywheel and driveshaft. The optimized result allows robust andreliable engine testing under all operating conditions

Notes:

Vendor supplied data

Publisher Number:

2013-01-0400

Access Restriction:

Restricted for use by site license