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이종선(ChongSun Lee) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.3
The research aims to establish a scientific basis for the required number of tie bands used in fastening stainless-steel coils in steel manufacturing lines. Strain gages were installed on the steel tie bands and stresses were measured during the banding and delivery procedure of coil rolls in the recoiling field. Our results showed that the springback stress was low when the coil thickness was below 3.0 ㎜, but increased significantly with increased thickness. The comparison between the measured springback stress and the theoretical springback stress formula developed in this study showed a good correlation coefficient of 0.945, thus demonstrating the usefulness of the formula in predicting the springback stress. Our results showed that the current factory standard on the number of tie bands did not significantly consider the increase in the springback force with increased coil thickness.
안정바와 측면봉 사용에 따른 샤워배변 휠체어의 강도 및 강성 해석
이종선(ChongSun Lee),제양규(YangGyu Jei),이환희(HwanHee Lee) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.5
Structural analysis was performed for a new type of shower commode wheel chair. The wheel chair structure was modeled for structural simulation, and stresses and deformation were evaluated depending on the presence of stabilizer and lateral bars used to supplement structural safety. Experiments were performed using strain gage rosettes and laser distance sensors to validate simulation results. The experiments showed that the stresses and deformation were within 10% of simulation results. The simulation showed that stabilizers and lateral bars were essential to reduce lateral deformation caused by bending of the plastic lower frame. Thus, the appropriate number of stabilizers and lateral bars needs to be determined to ensure structural safety while minimizing inconvenience in using the shower commode wheel chair.
2018 KSAE 대회를 위한 자작전기자동차의 설계와 제작
엄현식(Hyunsik Um),이관률(Kwanyul Lee),최용원(Yongwon Choi),한동완(Dongwan Han),이지은(Jieun Lee),이종선(Chongsun Lee) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
We designed a electric vehicle for 2018 KSAE competition. To reduce the weight of our vehicles, we used a magnesium extruded material AZ61 which is developed by POSCO, and also adopted a cross-shaped reinforcement inside the frame to compensate for the lack of strength and rigidity compared to steel. We designed 3D model of our electric vehicle, and implement structural analysis and vehicle dynamic analysis of parts that can be affected by load, with checking safety factor and the stability as well. We could not complete the race due to unexpected problems as a result of participating in the contest without test driving. We will expect good result with sufficient vehicle inspections and test driving for the next competition.
자작 전기 자동차의 이종 금속 활용 너클 설계 및 구조해석
박은석(Eunseok Park),김형민(Hyungmin Kim),김영승(Youngseng Kim),이종선(Chongsun Lee) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
This paper presents a new design and structural analysis of hand-made EV knuckles constructed with two different metals. Aluminum was used as the base material to reduce weight and steel was used as the HUB bearing house in the central region of the knuckle to enhance structural safety. Thermal stresses caused by the HUB bearing were simulated together with stresses caused by the external forces developing at the joints of lower control arm and upper control arm when the vehicle experiences a 30 degree step steering at 60Km/h. Our analyses also include experiences of structural failure of the HUB bearing and spindle shaft during the driving practice of the vehicle, and hence a modified design was suggested to guarantee enough safety. Structural analyses of the new knuckles were found to give appropriate safety factors under the maximum temperature condition of the HUB bearing and severe cornering condition of the vehicle such as the slalom test.
박하영(Hayoung Park),김시은(Sieun Kim),유성윤(SungYoon Yoo),이종선(Chongsun Lee) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
This study aims to improve the weight and stability by optimizing the structure of bumper system. Prior to the section design, ANSYS low speed collision simulations were performed for each material speed, and thickness using a closed D-type bumper beam model and parameters affecting the bumper performance were searched. The bumper beam performance was compared based on stress, deformation, plastic strain and weight. The performance of the bumper beam according to the sectional shape is important in terms of production cost saving and energy efficiency. Based on the results of this study, we will analyze and compare the performance of C and I type bumper beam and design an effective cross section design.
자작 자동차 설계를 위한 차량 동역학 모델링과 시뮬레이션
최효서(HyoSeo Choi),권양선(YangSeon Kwon),이태섭(TaeSeob Lee),이종선(ChongSun Lee) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
자작 자동차 설계 시에 차량 동역학 시뮬레이션을 통해 차량의 주행성능 및 구조적 안정성을 확인고자 하였다. 동역학 시뮬레이션을 수행하기 위하여 실제 자작자동차의 CAD 모델을 반영한 차량을 아담스뷰에서 모델링하였고, 실제 주행을 모사하기 위하여 스텝 스티어링에서의 차량의 동적 성능과 조인트 힘을 구하였다. 동적해석에서 구한 조인트 힘을 너클에 적용하여 구조 해석을 수행함으로써 부품의 안정성을 확인하였다. 차량을 제작하기 전에 시뮬레이션을 통해 차량의 동역학적 성능과 구조적 안정성을 파악함으로써 차량설계의 수정 및 제작 비용의 절감을 기대할 수 있다.