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국소배기장치의 후드 내 흡입효율 증대를 위한 가스유도장치 개발
오율권(Oh Yool-Kwon),김영선(Kim Young-Sun),윤희성(Yoon Hee-Sung) 한국태양에너지학회 2007 한국태양에너지학회 학술대회논문집 Vol.- No.-
In this study, a moving fluid of the hood surroundings performed a simulation and gasguidance-device designed a shape and position when the hood install the gas-guidance-device. This Program used SIMPLE-C (Sermi-Implicit Method for Pressure-Linked Equations Consistent) algorithm from mix a continuous function with momentum function. The results of numerical analysis is comprehended that velocity of hood attached gas-guidance-device is increased than without the gas-guidance-device. Also, the results of numerical analysis revealed that inhalation efficiency of hood is very useful when ratio of width and length of gas-guidance-device approached to 55~70%. In the end, the introduced technique of hood attached the gas-guidance-device is very useful to improve the inhalation efficiency of hood and using energy at industry field will reduced through the gas-guidance-device.
오율권(Oh, Yool-Kwon),양호동(Yang, Ho-Dong) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.1
현재의 컴퓨터는 고성능화, 다기능화, 소형화, 경량화 등의 이유로 인해 기기 내부에서 발생하는 열량이 증가하고 있는 추세이다. 컴퓨터의 성능을 높이고 수명을 연장하기 위해서는 발열을 효과적으로 제어할 수 있어야 한다. 본 연구에서는 열전소자를 이용한 열전냉각시스템을 구성하여 컴퓨터에 설치하였고, 실험을 통해 기존의 공기냉각시스템을 사용한 컴퓨터 내부의 온도분포와 열전냉각시스템을 함께 사용한 컴퓨터 내부의 온도분포를 측정한 후, 이를 비교하여 열전냉각시스템만을 사용한 컴퓨터 내부의 온도분포를 수치해석을 통해 예측하고 비교해 보았다. In recent years, the amount of heat generated inside of the computer has more increased because of high performance, multi-function, miniaturization and light weight. It is necessary to control the effective heat generation to improve performance and life extension of the computer. In this study, thermoelectric cooling system was manufactured using thermoelectric module and was attached to computer in order to control the heat generated inside computer. And the temperature distributions inside computer were experimentally measured and compared with and without thermoelectric cooling system to investigate the effect of cooling system. Also, to estimate the new cooling system which can substitute for the existing computer cooling system, temperature distributions inside computer were calculated by numerical analysis when there was no cooling system and was applied only cooling system to computer.
압전 엑츄에이터를 이용한 열전냉각장치의 냉각효율에 관한 실험적 연구
오율권(Yoolkwon Oh),최제세(Jese Choi),윤희성(Heesung Yoon) 한국자동차공학회 2008 한국자동차공학회 지부 학술대회 논문집 Vol.2008 No.11
This study was experimentally investigated on cooling effect of cold region to thermoelectric cooling device using thermoelectric module when piezoelectric actuator was used. In this study, a prototype of a miniature thermoelectric cooling device using thermoelectric module and piezoelectric actuator were proposed and constructed. The temperature of cold region was measured to investigate cooling effect of cold region to thermoelectric cooling device when piezoelectric actuator wasn't operated and was operated. Also, the flow visualization of cold region using He-Ne laser and CCD camera was experimentally investigated. The experimental set-up for temperature measurement and the flow visualization consisted of thermoelectric cooling device using thermoelectric module, piezoelectric actuator, T-type thermocouple, data acquisition unit, He-Ne laser, CCD camera, image grabber and PC. When piezoelectric actuator was operated, acoustic streaming was occurred by vibration of piezoelectric actuator, and it was improved cooling effect.
AC7A 알루미늄 합금 주조재를 이용한 타이어 몰드의 열변형에 관한 연구
오율권 ( Yool Kwon Oh ),최제세 ( Je Se Choi ) 조선대학교 공학기술연구원 2014 공학기술논문지 Vol.7 No.4
The accuracy of tire mold is very important in determining the quality of tire. Because it is made in closed tire mold is a permanent casting device, the investigation on the thermal deformation of tire mold has a lot of trouble. In this study, the thermal deformations such as temperature, displacement and stress distributions inside the AC7A casting material for tire mold were analyzed by numerical analysis according to the preheated temperature of permanent casting device. In order to verify the results of numerical analysis, the experiments for temperature measurement of the AC7A casting material were carried out under the same condition with numerical analysis. "COMSOL Multiphysics" was used for the numerical analysis. The preheated temperatures for numerical analysis were set up 150℃, 200℃, 250℃ and 300℃. The thermal deformations were calculated in each preheated temperatures. When the preheated temperature is 150℃, displacement and stress are the highest as 0.341mm and 0.481GPa, but the temperature is the lowest as 267.33℃. When the preheated temperature is 300℃, displacement and stress are the lowest as 0.25mm and 0.351GPa, but the temperature is the highest as 374.27℃. When the experimental results were compared with the numerical results, there were some temperature differences because of the latent heat by phase change heat transfer. However, the cooling patterns except for the latent heat section were almost similar.
AC7A 알루미늄 합금 금형의 응고과정에서 금형 내부에 발생하는 열변형에 대한 수치해석적 연구
오율권(Yoolkwon Oh),김용범(Yongbum Kim),양호동(Hodong Yang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The manufacturing industry such as automobile tire must be changed to consult the tastes of customers and is required to make the finest product that it has improved more stability and driving performance at consumer's desire in a quick time. In the present study, AC7A aluminum alloy casting mold which consist of 8 pieces is introduced as an analysis model. Also, numerical work using a finite element method was applied to investigate the thermal deformation that included the temperature distribution, stress and strain during the cooling process in AC7A aluminum alloy casting mold. The numerical results such as temperature distributions, stress and strain are presented to help to make the effective and the best tire mold. In addition, the introduced technique of numerical work using a finite element method is very useful and especially needs to improve the precision of tire mold such as sectional type or puzzle type.
알루미늄 합금 캐스팅 타이어 몰드의 열변형 해석에 관한 연구
오율권(Yoolkwon Oh),김영선(Youngsun Kim) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
In general, as the casting process is made progress at high temperature, thermal deformation of the mold directly affects the dimension of the casting products. For this reason, numbers of researches have been made with regard to the thermal deformation of the molds. Also, it gives many influence at size precision. So, while the mold product for the automobile tire was manufactured, the numerical analysis was performed based on the finite element method(FEM) in order to estimate the cooling pattern of the aluminum alloy material including temperature, displacement and stress. Also, for the numerical analysis, "COMSOL Multiphysics™", a commercial program for heat transfer analysis and thermal-structural analysis, was used. And, in order to verify the result calculated by the numerical analysis, the experiment was carried out using the metal casting device actually used for manufacturing the tire mold. The experimental setup consisted of metal casting device, data acquisition unit(DAQ 100), K-type thermocouple and PC. When the temperature distribution actually measured by the experiment was compared with the one calculated by the numerical analysis method, there was a slight temperature difference between the two results because of the latent heat of the aluminum alloy but their cooling patterns were almost similar.
FEM을 이용한 Tire Mold용 Al 금형의 온도분포 및 수축량 해석
오율권(Yoolkwon Oh),김재열(Jaeyeol Kim),서동표(Dongpyo Seo),양호동(Hodong Yang),박근욱(Keunuk Park),김우진(Woojin Kim) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The plant of Al alloy mold should be established to produce the good quality tires. However, mild steel mold is used as tire mold which is consist of one piece. This type of metal mold is more economic in the total cost but the quality of product is not enough. Therfore, in this study, Al alloy mold which consist of six pieces was introduced. Also, numerical analysis using a finite element method (FEM) was applied to analyze that Al alloy mold was happened the characteristics of temperature distribution. Moreover, the contraction rate occurred by temperature distribution investigated to predict the accurate measurement variations of Al alloy mold.
금형주조기를 이용한 알루미늄 합금 금형의 수치해석적 열변형 해석과 실험에 관한 연구
오율권(Yool-Kwon Oh),김용범(Yong-Bum Kim),윤희성(Hee-Sung Yoon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This study numerically and experimentally investigated on thermal strain analysis of aluminum alloy casting mold using metal foundry. To predict the numerical result of thermal strain in Al alloy casting mold during the cooling process, it is performed the investigation of temperature distribution, stress and displacement based on the physical properties of Al alloy. In results of this study, Al alloy casting mold represented rapidly cooling graph during initial 20minutes after beginning cooling process, therefore value of stress and displacement is rapidly changed during initial 20minutes after beginning cooling process. In addition to, temperature distribution obtained by experiment confirmed corresponding pattern then compared numerical analysis with experiment. These results are distribute to make the effective and the high precision casting mold.