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논문 기본 정보

자료유형
학술대회자료
저자정보
Jungwoog Sun (GM Korea Company) Namcheol Kim (GM Korea Company) Dalsik Kim (GM Korea Company) Byoungro Lee (GM Korea Company)
저널정보
한국자동차공학회 한국자동차공학회 추계학술대회 및 전시회 2015년 한국자동차공학회 학술대회 및 전시회
발행연도
2015.11
수록면
350 - 353 (4page)

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초록· 키워드

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At the hill road, during the launch, we can get the severe body vibration such as seat track, steering wheel and even interior noise. Especially for the 3cylinder, it could be worse than 4cylinder due to the 1<SUP>st</SUP> order imbalance. It means, in the case of 3cylinder, there are two kinds of sources, 1<SUP>st</SUP> and 1.5<SUP>th</SUP> orders. This study deals with assessment process for root cause. First step is to define the source - higher axle torque and imbalance level. Higher axle torque at the hill can make higher tractive road load and input force to the engine mount. Measured axle torque characteristic well matches with seat track vibration. Engine 1.5<SUP>th</SUP> order gas torque fluctuation at the hill is also much higher than at the flat road. Another source is 1st order imbalance which is 3cylinder specific issue. Second step is to look for the path – engine mount stiffness change and powertrain rigid body mode. Engine mount stiffness increased at the hill due to the higher axle torque. It can change powertrain rigid body mode at hill with stiffer engine mounts which can be increased up to max axle torque, or max input source. Additionally, through the 12DOF analysis using measured mount stiffness under the hill road condition, yaw mode at the hill is closed with issued frequency for the 1<SUP>st</SUP> order. So, powertrain rigid body mode could be one of the reason to increase the body vibration at the hill. Regarding body sensitivity, there is no changes even for the higher, almost double mount stiffness. However, it does not exactly reflect the hill road condition during the test. Further study is required. Therefore, source wise, we need to check the powertrain rigid body mode and higher gas torque fluctuation at hill. Path wise, we should check the engine mount stiffness change at the hill.

목차

Abstract
1. INTRODUCTION
2. STATUS
3. SOURCE
4. PATH
5. CONCLUSION
References

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