6 Speed Automatic Transmission Vibration Magnitude Prediction and Whine Noise Improvement through Transmission System Modeling Romax Technology, Limited

Format:

Conference/Event

Author/Creator:

Shin, Shin, author.

Contributor:

Baek, Sangbum

Hwang, Sungwook

Kanase, Ashish

Oh, Seiwoong

Shim, Hyutae

Conference Name:

SAE 2011 Noise and Vibration Conference and Exhibition (2011-05-16 : Grand Rapids, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

AbstractAs automotive technology has been developed, gear whine hasbecome a prominent contributor for cabin noise as the masking hasbeen decreased. Whine is not the loudest source, but it is of hightonal noise which is often highly unpleasant. The gear noiseoriginates at gear mesh. Transmission Error acts as an excitationsource and these vibrations pass through gears, shafts and bearingsto the housing which vibrates to produce noise on surrounding air.As microgeometry optimization target to reduce the fundamentalexcitation source of the noise, it has been favored method totackle gear whine noise, especially for manual transmission.However, practicality of microgeometry optimization for theplanetary gear system has been still in question, because ofcomplex system structure and interaction among multi mesh gear setsmake it hard to predict and even harder to improve.In this paper, successful case of whine noise improvement bymicrogeometry is presented. System level simulation model withaccurate details of actual test system condition such asclearances, measured microgeometry and test rig condition wereconstructed. The vibration at the accelerometer location at thehousing was predicted using the model. The comparison of the resultto test result showed very good correlation. Especially, theabsolute housing vibration level matched very well, which allowedengineers to use the simulation result during optimization processto make decision quickly without having to run the actual test toknow if the improvement was sufficient enough to meet the vibrationtarget. Microgeometry optimization was done for all gear sets inthe rear planetary. The predicted result of vibration showed 3 m/s₂reduction at the target speed range under target torque condition.The noise test result confirmed that the noise was reduced by 5~6dBA and the design target could be satisfied

Notes:

Vendor supplied data

Publisher Number:

2011-01-1553

Access Restriction:

Restricted for use by site license