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논문 기본 정보

자료유형
학술대회자료
저자정보
김지언 (한국지엠) 김정호 (한국지엠) 이창건 (한국지엠) 김용석 (한국지엠)
저널정보
한국자동차공학회 한국자동차공학회 춘계학술대회 2014 KSAE 부문 종합학술대회
발행연도
2014.5
수록면
829 - 838 (10page)

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초록· 키워드

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In all vehicle driving situations, some vibration level that is perceived by passengers is a criteria for determining the vehicle’s quality and ride comfort. The main excitations are from road, engine and wind. They can be classified as ‘Structural born vibration’ or ‘Air born vibration’ according to the load path. Among them, the most sensitive vibration paths from road and engine excitation that interface to body directly. Their performance level of vibration is dependent on a interface part’s stiffness, so generally we can improve it by increasing dynamic stiffness on this part at each frequency range. For this reason, in this study, we calculated dynamic stiffness at each frequency on interface parts with FRF(Frequency Response Function) based on CAE. Also we considered Topology optimization and size optimization process for an improved design in terms of vibration performance. The process is as follows; First of all, we identified the weak points as factors in the need to develop with FRF analysis on important interface parts. Secondly, we did topology optimization on areas that have weak dynamic stiffness which were identified in the first step. This result tells us that the load path is critical factor to improve stiffness. Thirdly, we re-organized some structure shapes based on the load path identified in the second step. In this step, we used ‘Morphing’ technology method for changing shape. Finally, we conducted size optimization for getting a final design that is optimized for dynamic stiffness improvement and mass reduction. In this study, we propose a useful method that can draw efficient solution of vehicle body’s dynamic stiffness improvement using an optimization process that sequentially covers shape change and thickness change.

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Abstract
1. 서론
2. FRF해석을 이용한 동강성 취약부 파악
3. 위상 최적화 결과를 고려한 형상변경
4. 두께 최적화 과정
5. 결론
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