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최병익,김완두,이학주,강재윤,김정엽,우창수,한승우,김주성,김기주,Choe, Byeong-Ik,Kim, Wan-Du,Lee, Hak-Ju,Gang, Jae-Yun,Kim, Jeong-Yeop,U, Chang-Su,Han, Seung-U,Kim, Ju-Seong,Kim, Gi-Ju 한국기계연구원 2002 硏究論文集 Vol.32 No.-
Even in the world wide automobile companies where a few simple modules are put into practical use, the front subframe modules of which performances of durability, NVH and crash are significantly important are under planing. In this study, design technology for the automobile front subframe module, which consists of an engine, a transmission and steering parts, structural components (frame, upper arm, lower arm and brake etc.) and rubber components(engine mount, axle mount and rubber disc etc.), was developed. A FEM-based analytical approach was used to evaluate the multiaxial high cycle fatigue damage of the front subframe module. Strain-life fatigue database system and expert system for fatigue properties of welded materials were developed. Stiffness values of the various rubber bushes mounted on the front subframe were evaluated by experimental method and FEM. TWB(Tailor Welded Blank) technology was applied to forming the cross member of the front subframe. Performance evaluations in relation to NVH and crash were conducted by using CAE technologies.
채홍윤(Hongyun Chae),정홍래(Hongrae Jeong),안희태(Heetae Ahn),손준형(Junhyeong Sohn),김성구(Seonggoo Kim),황한영(Hanyoung Hwang),김진성(Jinsung Kim) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The stiffness of subframe has a great effect on the NVH of vehicle. Usually, dampers are applied to subframe for NVH improvement. But it is inefficient because it excessively increases the weight of vehicle. It is necessary to improve stiffness while minimizing the weight gain of subframe. For this, we conducted the topology optimization and got the load path of subframe. We analyzed the load path and eliminated unnecessary parts to reduce weight. Structural important parts were reinforced to increase stiffness. It resulted in 0.3㎏ increase in the weight of subframe and 20.8㎐ increase in the natural frequency. In this study, We propose the method that improved the stiffness while minimize weight of subframe.
인장강도 1200 MPa 급 자동차 서브 프레임의 합금성분 최적화 및 열변형 거동 연구
정우창 ( Woo Chang Jeong ) 한국열처리공학회 2020 熱處理工學會誌 Vol.33 No.3
Four air hardening steels with carbon, silicon, manganese, chromium, and molybdenum variations have been used in this study to find out the optimal chemical compositions of steels with over 1200 MPa tensile strength for automotive subframe. The dimensional changes after heat treatment were determined for two automotive parts with open and closed cross sections using 3D scanner. When four steels were austenitized at 900℃ for 30 seconds, cooled at 3℃/s, reheated to 450℃ for 10 seconds followed by air cooling to simulate hot-dip galvanizing treatment showed ultra high tensile strength over 1200 MPa. Rear floor cross member with open cross section revealed much bigger dimensional changes than subframe with closed cross section after heat treatment at 900℃ for 20 minutes followed by air cooling. (Received April 16, 2020; Revised April 27, 2020; Accepted April 28, 2020)
안희태(Heetae Ahn),이계호(Kyeho Lee) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
In automobiles, weight reduction is required a lot to improve fuel efficiency. Lightening effect can be obtained by applying a polymer material. In steel parts, welding was the main method of bonding, but it is necessary to apply a suitable bonding method when applying composite materials. In this paper, composite materials were applied to reduce the weight of the chassis subframe. Using the EV Car’s front chassis subframe as a base model, it was redesigned to apply steel, aluminum, and composite materials for each sub-part. For NO.1, a composite material using the pultrusion method was applied, aluminum was applied for the side member, and steel was applied for the NO.2. For aluminum and composite joints, steel and aluminum joints, FDS (Flow Drill Screw), Blind Rivet, and adhesive bonding methods were applied. Through this, it was possible to reduce the weight by 11.6% compared to the front chassis subframe. A prototype was manufactured for the designed model and verified through tests such as single-product durability test, chassis module durability test, and complex environmental corrosion test.
알루미늄 고진공 다이캐스팅 공법을 적용한 전륜 서브프레임 개발
윤석진(Sukjin Yoon),김성구(Seonggoo Kim),김규록(Gyurok Kim),정의근(Euikeun Jeong),이용욱(Yonguk Lee),조영건(Younggun Cho) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In the automobile industry, many parts are manufactured by applying aluminum materials to improve fuel efficiency and reduce vehicle weight. In particular, in order to design and manufacture future electric vehicles, the weight reduction of vehicles is receiving more and more challenges. In the case of a suspension part, since it is located in the lower part of the vehicle, it has a great advantage of improving fuel economy due to weight reduction. This paper describes the development stage of a front wheel subframe with a welded structure of aluminum high vacuum die casting method and extrusion method. The result of the aluminum subframe study showed that the weight was reduced by 5.6㎏ and natural frequency was improved by 16㎐ compared with the steel subframe.
후륜 서브프레임 고유 진동 특성 설계 효율 증대를 위한 구성 요소 영향도 연구
고광진(Gwangjin Go),강창존(Changjon Kang),이계호(Kyeho Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Subframes used in rear-wheel chassis of automobiles have target stiffness values for each behavior mode in order to have the handling and NVH performance required to drive. In this study, to analyze the influence of each part composing the product on natural frequency, we divided the product named subframe into several sub-parts and panels. Then, the values were derived through the natural frequency analysis of the product in various cases where the thickness of the sub-parts and panels was changed. Finally, the influence of sub-parts and panels on the product’s natural frequency was analyzed using the the taguchi method, and the process and conclusion were shown. This study can help to design the stiffness of the subframe.
초대형 트럭 적재함과 서브프레임의 강도 해석 및 내구 수명 평가
문지훈(Moon, Ji Hoon),이강우(Lee, Kang Woo),유승훈(Ryu, Seung Hun),윤호상(Yun, Ho Sang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Put Abstract here. To develop the 27Ton dump truck, we should reduce weight about 180Kg in the upper body - deck and subframe. In general, dump truck dirver overload. Therefore if reduceing weight, fatigue problem will be occur at that component. Preventing this problem, stress analysis and fatigue life prediction were done at the early stage. As a result, upper body development ended successfully.
손경선(Kyoungsun Sohn),강동포(Dongpo Kang),이호도(Hodo Lee),이규환(Guewhan Lee),김대업(Daeup Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In recent days, aluminum alloys are used for automotive chassis parts construction in order to get weight reduction. Gravity casting among various aluminum casting processes is regarded to have good merit to make complex parts at a lower price and this makes increasing number of car-makers adopt the process for various chassis parts like control arms, knuckles and subframes. In this study, we've tried to develop a hybrid subframe using gravity hollow type sand casting process. FE-calculations for design optimization and casting simulation for process optimization were carried out. Samples cast with A356.0 alloy were tested after T6 heat treatment. Not only mechanical properties of the cast part but actual durability tests were also conducted in a module system to evaluate the acceptance for car application.
Development of aluminum subframe applied for extrusion and sheet forming Process
Gyewon Jang(장계원),Woosik Lee(이우식),Taewoo Kwon(권태우),Kaehee Oh(오경희),Daeup Kim(김대업) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The aluminum subframe was developed using by extrusion and forming, press stamping and welding. To achieve over 30% weight reduction compared to steel subframe and ensure structural strength and endurance, we performed forming simulation about several cross sections and the optimum design of cross section of extruded member could be determined. And we have developed high strength aluminum alloy for extruded member. For alloy development with optimum characteristics, change of tensile strength and elongation was observed according to Mg and Si contents. In addition, we tried to establish optimum aluminum welding conditions for good penetration depth and few pore defects, finally the prototype of aluminum subframe was assembled by using MIG welding. For evaluation of subframe, we have carried out durability test and buckling test etc. the results was considerable for our specification.
정비범 (Bee Bum, Jung),백설(Serl, Baik),박천일(Chun Il, Park) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Under driving, A vehicle experiences various kinds of load and suspension system support it. Road load causes chassis module’s fatigue failure and car accident. In developing early suspension, Fatigue tests require many times and costs. So It need to fatigue analysis. In this paper, in order to predict the fatigue performance of subframe, two analysis methods compared. Bush type is rubber and tpee in subframe front mounting bush. TPEE bush have more stiffness than rubber. Fatigue analysis method is Static analysis and Modal superposition method. Test results compare to them. Also Effect analysis progress about subframe fatigue performance. Through the paper, Fatigue analysis reliability of subframe is improved.