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황한영(Hanyoung Hwang),고승기(Seungkee Koh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Stress analysis of spring seat made of NBR rubber used for automotive steering ball joint was performed. Finite element technique was used for the stress analysis of the spring seat with two different section types of scoop and heart. Loading was divided into two step; plugging for ball joint assemblage and applied axial load for operation. High stress and strain concentrations were observed at the center hole of the scoop type rubber seat, where failure was expected. For the case of heart type rubber spring seat, magnitudes of stress and strain were quite small, resulting in better static/fatigue strengths than the scoop type rubber spring seat.
유한요소법을 이용한 자동차 조향 볼 조인트의 정적 강도평가
고승기(Seungkee Koh),황한영(Hanyoung Hwang) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Ball joints in an automotive steering system are used for transferring steering forces between links and tires. In this paper, stress analyses of ball joints consisting of body, ball stud, spring seat. and plug were performed to ensure the static strength in operation. Two types of engineering plastics instead of steels such as Nylon66 and Acetal were employed as spring seat materials. Elastic-plastic finite element analysis was done to simulate the plugging and axial loadings. Equivalent plastic strains in the Nylon66 and Acetal spring seats were 47% and 26%, respectively, resulting in the values less than fracture strains. Local plastic strains occurring in the steel plugs were much smaller than the fracture strain of the material. The plastic spring seats and steel plug were evaluated to satisfy the static strength of the ball joint. Further investigations were required to ensure the durability of the ball joint.
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.