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이승철(Seung-Chul Lee),강신유(Shin-You Kang) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.5
The eddy current brake system is a non-contact brake based on the mutual relation between the rail and the frame. Consequently, the accuracy is required in estimating the stress concentration and the deformation of the eddy current brake system. In this paper, the static analysis considering the gravity and the suction force for the deformation and the stress concentration of the main frame of the initially designed eddy current brake system was carried out. The shape of the I-type beam obtained from the optimization was analyzed and compared with the initial model. Also, the initial model was modified based on the optimization model and the result was verified to have the acceptable improvement.
리튬이온 배터리 방전 시 발열 특성 및 냉각 실험과 유한요소 해석
김석일(Seokil Kim),강신유(Shin You Kang) 강원대학교 산업기술연구소 2023 産業技術硏究 Vol.43 No.1
Lithium-ion batteries are predominantly employed in electric vehicles and energy storage devices, offering the advantage of high energy density. However, they are susceptible to efficiency degradation when operated at high temperatures due to their sensitivity to the external environment. In this study, we conducted experiments using an indirect cooling method to prevent thermal runaway and explosions in lithium-ion batteries. The results were validated by comparing them with heat transfer simulations conducted through a commercial finite element analysis program. The experiments included single-cell exothermic tests and cooling experiments on a battery pack with 10 cells connected in series, utilizing 21700 lithium-ion batteries. To block external temperature influences, the experimental environment featured an extrusion method insulation in the environmental chamber. The cooling system, suitable for indirect cooling, was constructed with copper tubes and pins. The heat transfer analysis began by presenting a single-cell heating model using commercial software, which was then employed to analyze the heating and cooling of the battery pack.
최윤기(Youn Gi Choi),강신유(Shin You Kang),김종일(Jong Il Kim) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.9
This paper examines the stability of the blades that convert the wind kinetic energy into the mechanical energy among the small wind power-generation systems, and proposes the design improvement for blades with a higher rigidity and a lighter weight than the conventional blades. The composite-specimen tensile test and static-load test are conducted to verify the reliability. To design the lightweight blade with the high stiffness, the displacement and the safety factor of the blade composed of the composite material are calculated from the structural-analysis results, and the optimal dimensional and material designs are performed. The optimal design parameters are selected by the shear-web lamination angle and the lamination thickness. The objective function is selected by the safety factor and the weight. For the optimum material design, the GFRP is converted into the CFRP. In this paper, the structural improvement is performed by optimizing the dimensional and material designs, the blade stiffness and weight are redesigned and compared with those of the designed blades, and the structural stability of the redesigned blades is also examined.
열린 단면 부재의 굽힘 붕괴 실험 및 해석에 관한 연구
이승철(Seung-Chul Lee),강신유(Shin-You Kang) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.4
The open section members have been used as the members of vehicle such as automotives, airplanes and trains. When vehicles are crashed, these members have absorption of the energy and it is necessary for retainment of the survival space, and as the result, the prediction for the displacement of members in this case of the crash of vehicles is very important. The displacements of members in this case of the crash of automotives show combined aspect of both axial collapse and bending collapse. In the rollover accident when bending collapse happen, the collapse of each members is progressed by the plastic hinge which made from bending moment, and therefore the research for the behavior of members under bending moment after collapse is necessary to determine the internal energy which the members can absorb and the deformed shapes of the members on the step of design. In this paper, the characteristics of bending collapse at the members of the open cross-section were studied with experiment and numerical analysis. We made a comparative studied of the result of the experiment, and changed the axis according to the parallel-axis theorem.
이정완(Jeong-Wan Lee),강신유(Shin-You Kang) 한국산업융합학회 2004 한국산업융합학회 논문집 Vol.7 No.2
본 논문에서는 시간지연 제어기와 관측기를 사용하여 산업용 로봇을 위한 고속 제어 방법을 설계하였다. 설계된 방법은 로봇의 매개변수 변화나 비선형이 존재하는 상황에서도 강인한 제어성능을 보이게끔 개발되었으며, 실제구현을 하였을 때도 계산량이 적으면서 동시에 구현이 쉬운 방법이다. 평면 2 자유도 스카라 로봇의 적용을 통하여 실험을 하였는데, 그 결과 실제 시스템에 효과적으로 적용될 수 있음 확인하였다.
이인범(In Beom Lee),강신유(Shin You Kang),김석현(Seock Hyun Kim),유원화(Won Wha Ryoo) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.10
이 응용논문에는 적응형 로드리미터에 대해 기술되어 있다. 적응형 로드리미터는 안전벨트의 구성품 중 하나이며, 이는 승객의 다양한 체중과 키에 따라 하중량을 고하중과 저하중으로 변환시킬 수 있는 장치이다. 최근, FMVSS 208규정은 다양한 더미크기에 대해 엄격한 안전기준을 요구하고 있다. 이에 따라 우리는 고하중 조건과 저하중 조건 시 각각 더미에 흉부 상해정도를 알아보았고, 실험을 통해서 벤치마킹모델의 하중조건을 확인하였다. 이를 토대로 적응형 듀얼레벨 로드리미터를 개발하여 성능실험을 실시하였고, 유한요소해석을 통해 설계 개선점을 확인하였다. In this paper, the development of an adjustable load limiter is presented, which is a component of the seat belt. The adjustable load limiter is loaded at different levels for varied weights and heights of occupant. The recent regulation FMVSS 208 demands strict safety standards for different percentiles of dummy size. In this work, high- and low-level load conditions are proposed according to dummy scale and thoracic injury criteria. The suggested load conditions were verified by performing a sled test using the benchmark model. A dual-level load limiter has been developed on the basis of these tests. Experiments were conducted on the product performance, and finite element analysis was carried out; the results confirmed the points for improvement.