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채홍윤(Hongyun Chae),정홍래(Hongrae Jeong),임민혁(Minhyeok Yim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In the production process, the assemblability of products decrease that different from what we expected on designing. So we have to revise the dimension and the tolerance in optimized methods to minimize losses of the cost and the schedule. For this, I applied Tolerance analysis. And I identified the quality changes due to the dimension changes and the accumulated tolerance. And then I drew the optimized conclusion. On the trailing arm and carrier assemblability, I found out that the most effective factor is the hole size tolerance of trailing arm. And I drew the optimized conclusion as the hole extension of trailing arm. It decreased assembly error and have been applied to the products. Finally I checked improvements of the products assemblability. With this study, I improved the assemblability of the trailing arm and carrier by minimized design change. Monte carlo tolerance analysis what I used in this study is pretty accurate. And it can be used as the effective method to design dimensions and optimized tolerances.
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.
피로 제한조건을 고려한 서스펜션 암의 최적설계에 관한 연구
채홍윤(Hongyun Chae),안희태(Heetae Ahn),이계호(Kyeho Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Structural optimization analysis suggests optimized conditions of design variable considering objective function and constraint defined by engineer. It is more efficient method then generally what we do to design suspension arms. Because it allows us to consider variable requirements of suspension arm at the same time. In this study, fatigue damage constraints were defined on optimization problems. And differences of shape and performance that occurred by fatigue damage constraints were reviewed. Topology optimization was applied to the front lower arm, and it caused differences of hole size-shape, profile. The rear trailing arm which applied topography optimization shows different bead shape and depth depending on fatigue damage constraint. Both of optimization results not only caused differences of shape, but also improved fatigue durability. It means fatigue damage constraint can be applied effectively for others where fatigue durability is important such as suspension arm.
안희태(Heetae Ahn),채홍윤(Hongyun Chae),이계호(Kyeho Lee),김진성(Jinsung Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In the automotive industry, TWB method is a main solution to reduce weight of the vehicle and improve fuel efficiency. It is possible that different strength and thickness steel panel are bonded using TWB. It can reduce the weight and increase the strength of the required area. In the study, TWB method is applied to the cross member of suspension. Each Upper panel and lower panel is designed as the unified type. And we can verify the fatigue endurance of the cross member sample with TWB applied using chassis module endurance test.
위상최적화를 이용한 샤시 암브라켓의 설계 개선에 대한 연구
이민구(Mingu Lee),채홍윤(Hongyun Chae),이계호(Gyeho Lee) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
This paper introduces a method for improving the design of an arm bracket for the vehicle suspension using topology optimization. Among the suspension parts, the arm bracket is a functional part that directly supports the load from the road surface, and for the stability of the suspension, durability is the most important and requires a robust design for the vulnerable area. In this paper, the topology optimization method was applied to improve the durability of the arm bracket, and the effectiveness of the design improvement was verified through analysis.
T-joint 필렛 용접 하중 및 용접부 갭에 따른 피로 특성 연구
안희태(Heetae Ahn),채홍윤(Hongyun Chae),최돈현(Donhyun Choi),김성겸(Sunggyum Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
Welding is widely used in the automobile industry, but suspension parts are exposed to various load conditions and are vulnerable to fatigue damage in the welding part. Durability problems occur in areas where gas metal arc welding of subframes and arms is applied. In this study, the fatigue characteristics according to the load direction were analyzed through specimen tests for the T-joint fillet welding structure where welding cracks usually occur, and the fatigue limit according to the gap of the welding part was compared. For each load, the fatigue limit load was compared 300,000 cycles times for each condition of the welding part gap 0, 0.5mm. 1.0mm in the load direction in the tensile, shear, and ± bending directions. Through this, when designing suspension parts, a method for robust design depending on the load direction was identified, and in T-fillet welding, the penetration of the root part had a significant effect on the fatigue durability of the welding part.
T-joint 필렛 용접 형상 및 하중 방향에 따른 피로 특성 연구
안희태(Heetae Ahn),채홍윤(Hongyun Chae),최돈현(Donhyun Choi),오창영(Chang-Young Oh),이진호(Jin-Ho Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Welding is widely used in the automobile industry, but suspension parts are exposed to various load conditions and are vulnerable to fatigue damage in the welding part. Durability problems occur in areas where gas metal arc welding of subframes and arms is applied. In this study, the fatigue characteristics depending on the shape of weld and the load direction were analyzed through specimen tests for the T-joint fillet welding structure. The fatigue limit load was compared 300,000 cycles times for each load condition of the welding part in the tensile, shear, and ± bending directions. A method for robust design depending on the load direction designing suspension parts was identified. And the durability of the double-sided welding in T-fillet joints was compared with the single-sided welding.