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구조기구조기인 아이들 소음 저감을 위한 차체 골격 내 복합체 삽입 최적설계
김효식(Hyosig Kim),윤성호(Seongho Yoon),김중희(Joonghee Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
As a matter of fact, it has been difficult to modify the shape of vehicle body skeletons since the technical definition for a global body structure was fixed and the corresponding molds were developed. By the way, if it is available to apply an alternative to reinforce the skeletons without changing their molds, it will be more flexible to improve the performance qualities relevant to crash, durability and NVH(Noise, Vibration and Harshness). Recently, a solution with the composite body becomes available for the purpose. We present an optimal design method to insert the composite bodies into a vehicle body skeleton in order to improve the structure-borne noise at the idle condition. The algorithms, topology optimization and gradient based optimization, are applied to mainly search the sensitive structural joints in the body skeleton and to extract the technical definition of composite body insertions. Inserting the composite bodies into the sensitive joints, it is predicted to achieve the countermeasure which can meet the design availability in terms of the idle noise and the weight. According to the validation result with test vehicles, the concerned noise transfer function is reduced and the idle booming noise is resultantly improved.
김효식(Hyosig Kim),김태영(Taeyoung Kim),이홍우(Hongwoo Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Design for six sigma or sigma based robust design will have a major influence on the future design, if it is applied during<br/> the conceptual design phase or design change phase. This will result in more improved but less expensive mechanism. This<br/> paper presents the implementation of a DFSS(Design For Six Sigma) for robust design of a brake judder of heavy duty trucks.<br/> Comparison of results according to design strategies, that is, a conventional deterministic optimization and a probabilistic one<br/> using a proposed sigma based robust design method, make clear the reason why the proposed one is necessary and the role of<br/> DFSS.
6시그마 설계의 IDDOV 모델을 이용한 제동시 이상 진동 품질개선
김효식(Hyosig Kim),김상섭(Sangsup Kim),임홍재(Hongjae Yim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Design for Six Sigma(DFSS) will have a major influence on the future design, if it is applied during the conceptual design phase or design change phase. This paper discusses an approach of Design for Six Sigma using IDDOV model in order to improve braking quality. Because the proposed model focus in preventing failures from happening and can be effectively applied to stages of research, design and development. The proposed model is more effective than the existing models, such as, DMAIC. This will result in more improved but less expensive satisfaction of customer. Examination of results according to the design strategy makes clear the reason why the DFSS with IDDOV model is necessary.