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박영철(Young-Chul Park),강정호(Jung-Ho Kang),오승환(Seung-Hwan Oh),공형걸(Hyeung-Geol Kong),송학관(Xueguan Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
The valve is used on control of flow and hydraulic in industry. Flow coefficient of valve is very importance in the design of valve. In this paper, three-dimensional computer simulations by commercial code CFX were conducted to observe the valve type and to measure valve flow coefficient when valve with various angles and uniform incoming velocity were used in a piping system. By contrast, a group of experimental data is used to compare with the data obtained by CFX simulation to investigate the validity of numerical method.
스프레깅 현상 최소화를 위한 틸팅 패드 베어링의 형상 최적화
김세훈(Se-Hun Kim),박영철(Young-Chul Park),강정호(Jung-Ho Kang),공형걸(Hyeung-Geol Kong),조영직(Young-Jik Jo) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Currently, operated fluid film tilting pad bearing is used as a partition pad, because it is easy to repair and enhance life. But it is generated Fluttering by unloaded of upper pad, and occurred damage which is defined spragging where leading edge of upper pad. Therefore this paper predicts that the amplitude of each pad and the optimal position of Pivot Hole using computer simulation. And this paper performed the research which minimize Spragging shape.
비냉각 적외선 이미지 센서의 바이메탈 MicroCantilever 변형
강정호(Jung-Ho Kang),박영철(Young-Chul Park),이영훈(Young-Hun Lee),오승환(Seung-Hwan Oh),공형걸(Hyeung-Geol Kong),송학관(Xueguan Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This is a widespread requirement for low cost lightweight thermal imaging sensors for both military and civilian applications. Today, a large number of uncooled infrared detector developments are under progress due to the availability of silicon technology that enables realization of low cost IR sensor. System prices are continuing to drop, and swelling production volume will soon drive process substantially lower. The feasibility of micromechanical optical and infrared (IR) detection using microcantilevers is demonstrated. Microcantilevers provide a simple Structurefor developing single- and multi-element sensors for visible and infrared radiation that are smaller, more sensitive and lower in cost than quantum or thermal detectors. Microcantilevers coated with a heat absorbing layer undergo bending due to the differential stress originating from the bimetallic effect. This paper reports a micromachined silicon uncooled thermal imager intended for applications in automated process control. This paper presents the design, fabrication, and the behavior of cantilever for thermomechanical sensing.
적외선 이미지 센서의 바이메탈 MicroCantilever 변형에 관한 연구
강정호(Jung-Ho Kang),박영철(Young-Chul Park),이영훈(Young-Hun Lee),오승환(Seung-Hwan Oh),공형걸(Hyeung-Geol Kong),송학관(Xueguan Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.10
This is a widespread requirement for low cost lightweight thermal imaging sensors for both military and civilian applications. Today, a large number of uncooled infrared detector developments are under progress due to the availability of silicon technology that enables realization of low cost IR sensor. System prices are continuing to drop, and swelling production volume will soon drive process substantially lower. The feasibility of micromechanical optical and infrared (IR) detection using microcantilevers is demonstrated. Microcantilevers provide a simple Structurefor developing single- and multi-element sensors for visible and infrared radiation that are smaller, more sensitive and lower in cost than quantum or thermal detectors. Microcantilevers coated with a heat absorbing layer undergo bending due to the differential stress originating from the bimetallic effect. This paper reports a micromachined silicon uncooled thermal imager intended for applications in automated process control. This paper presents the design, fabrication, and the behavior of cantilever for thermomechanical sensing.