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서스펜션 체결용 플랜지 볼트 좌면 각도에 따른 풀림 영향도 연구
이준민(Joonmin Lee),이민구(Mingu Lee),안혜민(Hyemin Ahn),박형석(Hyoungseok Park),이계호(Kyeho Lee) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
The loosening robustness of the hardware for the coupling of each part in the suspension is an important factor for passenger safety. For this reason we have designed suspension fasteners in consideration of factors that affect the loosening in advance. There are several factors that affect hardware loosening, including coefficient of surface friction, thread friction, tightening torque, axial force and equivalent diameter, etc. There is a difference in bolt bearing surface angle depending on the process capability of each flange bolt manufacturer, and in this study, we checked how hardware loosening effect changes depending on flange bolt bearing surface angle
서스펜션 체결용 플랜지 볼트 좌면 각도에 따른 축력 영향도 연구
이민구(Mingu Lee),이준민(Joonmin Lee),안혜민(Hyemin Ahn),박형석(Hyoungseok Park),이계호(Kyeho Lee) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
This paper introduces how the flange surface angle of the flange bolt affects the preload. Flange bolts, which is commonly used for tightening the chassis of a vehicle, have a certain angle on its flange surface to secure the contact surface of the flange and the relative parts when seated regardless of the dispersion of the surface angle. In this study, the relationship between flange angle and the preload for each cases of different surface angle will be described through preload measurements.
백승진(Seungjin Baek),이계호(Kyeho Lee),신준섭(Junseob Shin),박민수(Minsoo Park),김성구(Seonggoo Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
Torque control and angle control are used as automotive chassis parts tightening method. In general, torque controlled tightening method is used in elastic range and angle controlled tightening method is used in plastic range of bolts. This paper describe experimental analysis of bolt axial force scatter by ultrasonic bolt tension measurement about torque control and angle control in elastic range of bolts.
후륜 서브프레임 용접 설계 변수에 따른 용접민감도 분석
윤석진(Sukjin Yoon),이계호(Kyeho Lee),김요셉(Yoseb Kim),김태진(Taejin Kim) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Each Part of the rear subframe for an automotive is joined by a welding. The quality of welded joint may be dispersion depending on various conditions such as operator proficiency, work environment, etc., and this effect may cause differences in the design life of the initially predicted product. In this study, fatigue analysis of the rear subframe welded joint part was performed using FEMFAT which a commercial fatigue analysis program. In addition, the weld sensitivity analysis considering weld quality according to the shape variable of the welded joint part was performed, and fatigue life changes at positions of the major vulnerable parts were studied.
윤석진(Sukjin Yoon),이계호(Kyeho Lee),김성구(Seonggoo Kim),정현진(Hyunjin Jung),김정(Jung Kim),이지현(Jihyun Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
An Automotive front cross member supports many crucial components and systems, such as an engine, transmission, and suspension. Important performance measures for the design of a front cross member include durability, stiffness, and NVH, while minimizing weight of primary concern. This paper presents an effective and efficient methodology for front cross member design from conceptual design to detailed design using design optimization.
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.
백승진(Seungjin Baek),이의성(Euiseong Lee),이계호(Kyeho Lee),장민(Min Jang),박형석(HyeongSeok Park) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Torque control is used as automotive chassis parts tightening method. Torque controlled tightening method has axial force scatter of bolt. Axial force scatter should be minimized for robust chassis systems. This paper describe experimental analysis of bolt axial force scatter by ultrasonic bolt tension measurement about one time tightening and re-tightening method.