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자동차 속도감응형 LED 주행상태 안내 시스템의 주행상태 인지성에 대한 연구
양동희 ( Donghee Yang ),홍성인 ( Sungin Hong ),최병기 ( Byungky Choi ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.2
Present automobile driving indicating system hasn`t provided variable driving infromation(the increase or decrease of the velocity, parking and backware drive etc.). In this study, we developed the driving state led guide system according to automobile velocity response and carried out the awareness test at various conditions(day and night, sex, ages and driving status). According to the results, awareness about the driving state led guide system was higher in 20 ages and woman group than other group. At night driving, awareness of this system was generally increased because the visual information was more important than day. Also, awareness was more increaed in case of decelerating driving than other driving status because danger recognition was higher than the other driving status and the dependent of this system was increased.
텅스텐 중합금의 단열전단밴드 형성 및 국부화에 대한 연구
황두순(Doosoon Hwang),홍성인(Sungin Hong) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.6
In a plastic metal forming of thermally rate-sensitive material, the localized shear band stems from evolution of a narrow region in which intensive plastic flow occurs. And it give rise to fatal fracture with plastic instability. The objectives of this study are to investigate the localization behavior by using numerical method and predict the failure for WHA(Tungsten Heavy Alloy). In this work, the implicit finite difference scheme is used because of the advantage about convergence and the numerical stability. This study is based on an analysed material with hardening as well as thermally softening behavior which includes isotropic strain hardening and observed the extension of localization within shear band according to material properties.
유체 유동을 고려한 유동부를 갖는 용접부 형상의 마찰용접 해석
염성호(Sungho Yeom),김범년(Bumnyun Kim),홍성인(Sungin Hong) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.3
Friction welding is a welding method to use frictional heat of a couple of materials. In this paper object is that design the welding part shape with the flow gallery part which there is no effect in flow. Decided the welding part design parameter and doing the friction welding analysis used the rigid-plastic FEM program DEFORM-2D. To do friction welding analysis must input necessary flow stress data, friction coefficient by temperature change, upset pressure and Revolution per minute etc. According to analysis result, it decided the optimal shape of welding part with no effect in flow.
고압 튜브를 위한 전후방 유동성형에서의 성형력에 관한 연구
남경오(Kyoungo Nam),염성호(Sungho Yeom),홍성인(Sungin Hong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The flow forming, also known as tube spinning, has been used to produce long thin walled tube parts, with reduced forming force and enhanced mechanical and surface quality for a good finished part, compared with other method formed parts. As the tool is applied locally on the workpiece, the total forming forces are reduced significantly compared to other forming method. Spinning and flow forming techniques are used frequently in automotive, aerial, space, defense industry. In flow forming, forward and backward flow forming methods are classified in accordance to their direction of axial flow during the process. For forward flow forming, the material flows in the same direction as that of the traversing rollers. This method is suitable for making high precision thin walled cylinders, such as hydraulic cylinders, high-pressure vessels, launcher tubes and combustion chamber. For backward flow forming, spun material flows under the roller in the opposite direction of the roller towards the unsupported end of the mandrel. In this paper, finite element method analysis of three-roller forward and backward flow forming for high pressure tube is carried out to study effects of forming depth and feed rate on forming force. The axial and radial forming forces of forward flow forming on several forming depth and feed rate conditions are compared with those of backward flow forming.