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안희태,김태완,유은종 한국지진공학회 2023 한국지진공학회논문집 Vol.27 No.1
The column-tree type steel beam-column connections are commonly used in East Asian countries, including Korea. The welding detail between the stub beam and column is similar to the WUF-W connection; thus, it can be expected to have sufficient seismic performance. However, previous experimental studies indicate that premature slip occurs at the friction joints between the stub and link beams. In this study, for the accurate seismic performance evaluation of column-tree type moment connections, a moment-slip model was proposed by investigating the previous test results. As a result, it was found that the initial slip occurred at about 25% of the design slip moment strength, and the amount of slip was about 0.15%. Also, by comparing the analysis results from models with and without the slip element, the influence of slip on the performance of overall beam-column connections was examined. As the panel zone became weaker, the contribution of slip on overall deformation became greater, and the shear demand for the panel zone was reduced.
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.
이종재 알루미늄 및 고장력강의 기계적 접합부에 대한 접합 성능 연구
안희태(Heetae Ahn),최병철(Byungchul Choi),박지형(Jihyung Park) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In order to improve fuel efficiency, the global automobile and parts industry is developing with a focus on the weighting of vehicles by upgrading various component technologies such as application of lightweight materials and development of new bonding technologies. In particular, the lightening of vehicles is becoming more essential to design and manufacture future electric vehicles. Appropriate selection of joining techniques for dissimilar material connections in the replacement of aluminium from steel parts for lightening should be considered of great importance in terms of vehicle productivity and safety. In this study, the joint strength according to the joining conditions, such as adhesion application, was assessed by applying FDS (Flow Drill Screw) and blind rivets as a mechanical joining method for aluminum and high strength steel. The joint strength was also verified by comparison with comparison with the experimental results through FE analysis.
자석 형상 최적화를 통한 축방향 이상 횡자속형 전동기의 토크 특성 향상에 관한 연구
안희태(Ahn, Hee-Tae),장건희(Jang, Gun-Hee) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.10
Transverse flux machine(TFM) has been developed to drive a machine of large input power at low-speed. However, it has complicated structure and large torque ripple due to its inherent structure. In this paper the characteristics of torque of a rotatory two-phase TFM are analyzed by using the 3-dimensional finite element method and optimal design. This research shows that one of the effective design variables is the skew angle of permanent magnet. The skew angles of permanent magnet are optimized by using a genetic algorithm. It also shows that the proposed optimal skew magnet not only increases average torque but also decreases torque ripple of a rotatory two-phase TFM.