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다구찌 방법을 이용한 초대형 중심형 버터플라이 밸브의 설계민감도해석
공형걸(Hyeong-Geol Kong),강동헌(Dong-heon Kang),김승규(Seung-gyu Kim),강정호(Jung-Ho Kang),박영철(Young-Chul Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
In today's industry, the butterfly valve has been used to control a flow effectively. The research which it sees confronts to thee shape optimization for the weight decrease of extra-large size butterfly valve. The weight reduction in order to do it use the reinforcement, and the design sensitivity analysis in order do it use determination of design variables and response functions is discussed. In the result approximately 20% weight decrease conclusion with use of the reinforcement, the optimal shape comes from performance by modification of the reinforcement hole.
Butterfly Valve 설계를 위한 Valve Type과 유량 계수의 관계에 대한 연구
박영철,강정호,오승환,이영훈,공형걸,송학관 한국항해항만학회 2007 한국항해항만학회지 Vol.31 No.1
valve is used on control of flow in a ship. 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 flow coefficient when valves 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. 밸브는 선박에서 유체의 흐름과 유량을 제어하기 위해 사용된다. 유량 계수는 밸브의 설계에서 매우 중요한 요소이다. 본 연구에서는 상용프로그램인 CFX의 3차원 컴퓨터 시뮬레이션을 이용하여 동일한 유속이 적용될 경우 밸브의 형과 밸브 열림 각도에 따른 유량 계수를 계산하였다. 그리고 실험 결과와 비교하여 CFX 시뮬레이션 해석을 통해 얻은 결과의 신뢰성을 검증하였다.
DACE 모델을 이용한 게이트밸브 단조공정의 최적설계화
오승환(Seung-Hwan Oh),공형걸(Hyeong-Geol Kong),강정호(Jung-Ho Kang),박영철(Young-Chul Park) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.1
In case of the welding process, a conventional production method of gate valve, it has a merit of light weight, but also a demerit of high production cost and an impossibility in mass production due to work by hand. However, in case of the forging process, it has economic merits and can take a mass production process, too. The main focus of this paper is the optimization of preform in the forging process. This paper proposed an optimal design to improve the mechanical efficiency of gate valve made by forging method instead of welding. the optional design is conducted as application of real response model to Kriging model using computer simulation. Also, from verification of the response model with optimized results we were confirmed that the applications of Kriging method to structural optimum design using finite element analysis and equation are useful and reliable.
Computer Simulation을 이용한 Valve Type과 유량 계수의 관계에 대한 연구
박영철(Young-Chul Park),강정호(Jung-Ho Kang),오승환(Seung-Hwan Oh),공형걸(Hyeung-Geol Kang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
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.
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.
Butterfly Valve 설계를 위한 Valve Type과 유량 계수의 관계에 대한 연구
오승환(Seung-Hwan Oh),이영훈(Young-Hun Lee),공형걸(Hyeung-Geol Kang),송학관(Xueguan Song),강정호(Jung-Ho Kang),박영철(Young-Chul Park) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1
밸브는 선체에서 유체의 흐름과 유량을 제어하기 위해 사용된다. 유량 계수는 밸브의 설계에서 매우 중요한 요소이다. 본 연구에서는 상용프로그램인 CFX의 3차원 컴퓨터 시뮬레이션을 이용하여 통일한 유속이 적용될 경우 밸브의 타입과 각각의 Valve Disc 열림 각도에 따른 유량 계수를 계산하였다. 그리고 실험 결과와 비교하여 CFX 시뮬레이션 해석을 통해 얻은 결과의 신뢰성을 검증하였다. The value is used on control of flow and hydraulic in a ship. Flow coefficient of value 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 value flown 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.