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충돌 안정성, 소음진동 및 내구의 다분야 통합 최적설계를 이용한 차체구조의 경량화
김효식(Hyosig Kim),인준교(Junkyo In) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
This paper presents a study on the multidisciplinary design optimization compromising Crashworthiness, NVH and Durability for weight reduction of a vehicle body structure. The objective function is the weight of the body structure. The design constraints are selected from the major performance responses from NVH, Crashworthiness and Durability. And the design variables consisted of three categories: panel thicknesses, material grades and presence/absence of structural parts. NVH performance is estimated with two kinds of computational models: BIW(Body in White) and BIG(Body in Grey: Semi full vehicle). In case of BIW, two fundamental modal frequencies of 1st torsional and 1st bending modes are traced. In case of BIG, total 32 IPI(Input Point Inertance) at the body mountings are investigated and total 58 VTF(Vibration Transfer Function) of panels encompassing the acoustic cavity are studied. The targets of these NVH related responses have been deployed from the vibro-acoustic standard. CRASH requirement is investigated with 3 kinds of crash protocols: Frontal crashworthiness: BFD(Frontal Deformable Barrier) and 2 side ones: AEMDB of KNCAP and ENCAP. DURABILITY criteria is investigated with not only fatigue damages of structural panels but also failures of spotwelds. To find the optimal design candidates, this study adopts the meta-models using RSM(Response Surface Model) which are obtained through DOE(Design of Experiments). And then Genetic algorithm is used to search out the global minimums with the metamodels. This study finds a few configurations that can save the weight of the selected parts from 4.9 % up to 10.3 % of the baseline design. The proposed configuration presents a satisfactory compromise between the performances and weight reduction, although it is complicated to gain a balance because they are more contradictory under the modern Paradigem: front-loading design and reduction of development time.
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고온, 다습 조건에서 발생하는 변형에 대한 플라스틱펜더 최적설계
임종봉(Jongbong LIM),이재형(Jaehyung LEE),인준교(Junkyo IN) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Nowadays strict CO2 regulation leads lightened vehicle development to overcome it by worldwide motor company. One of main solution for it is to apply plastic material for front fender but the material is extremely weak for high thermal and humidity even with specific plastic material. After all, it makes restriction for engineering of the part. Most of the solution against the concerns had been developed but countermeasure for style freedom should be created more. Especially serious concern happens mainly at A pillar of body side in case of vehicle with horizontal fender parting line. It gives big impact to engineering feasibility. So this paper explains capitalized solution against it, which was studied and applied to Renault-Samsung’s current vehicle.
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