Browse Publications Technical Papers 2017-01-1779
2017-06-05

A Study on Reducing Gear Rattle Noise Based on Sensitivity Analysis of Drivetrain Torsional Model 2017-01-1779

With drastically reduction of engine noise, the gear rattle noise generated by the impact between neutral gears inside transmission can be much easily perceived. It is well known that the torsional mode has a direct relationship with the transmission gear rattle noise. This paper establishes a torsional model of a front wheel drive automotive drivetrain, including clutch system, transmission box and equivalent load of a full vehicle, in AMESim software. The experimental engine speed fluctuations at different gears are used to excite the torsional model. The influences of several parameters, including flywheel inertia, clutch stiffness, clutch hysteresis and drive shaft stiffness, on the 2nd order (major engine firing order for a 4-cylinder-4-stroke engine) torsional resonant frequency and the 2nd order torsional resonant peak of the transmission input shaft are analyzed by changing them alternatively. The model is validated by a comparison between the simulated and measured 2nd torsional resonant peaks. It is concluded that the optimized drivetrain parameters reduce the 2nd order torsional resonant peak of the transmission input shaft effectively. Some control strategies are successfully applied to a prototype vehicle to reduce the gear rattle noise which meets the subjective evaluation criterion.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
JOURNAL ARTICLE

Characterizing the Onset of Manual Transmission Gear Rattle Part I: Experimental Results

2009-01-2063

View Details

TECHNICAL PAPER

Crawler Transaxle with Differential Lock and Variable Steering

821103

View Details

TECHNICAL PAPER

Safety Aspects While Operating in Winter

890040

View Details

X