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비전 변형률 측정 시스템을 이용한 마이크로 박판소재의 물성평가 기술
이혜진(Hye-Jin Lee),이낙규(Nak-Kyu Lee),최석우(Seogou Choi),이근안(Geunan Lee),신준희(Junhee Shin),김태주(Taejoo Kim),주은덕(Andy Chu) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.5
This paper is concerned with the precision material property measurement of a micro metal thin foil (Ni-99.9%) that is used in MEMS technology. Since these MEMS components require great precision and accuracy, evaluation of reliability such as the life cycle endurance test, impact test, and residual stress test is necessary for these components. However, in practice, real reliability tests are not easy to perform due to consideration of various factors. Rather than actual testing, it would be much easier to evaluate the reliability of components by the analytical approach. Although the analytical method is utilized by numerical software tools, it is obviously necessary to acquire fundamental properties of materials through real test methods. But the acquisition method of micro strain data is so difficult in micro tensile testing, because the micro tensile testing specimen has several micros thickness and small size of shape. So we research on the measurement method of micro strain data using a vision image analysis.
이형욱(Lee Hyoungwook),이근안(Lee Geunan),김정배(Kim Jeongbae) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.6
An inverter scroll compressor is used for the air conditioning in cars. Scrolls would be changed from the aluminum material to the magnesium material in order to satisfy the light weight trends of cars. The material changing influences on the scroll dimensions particularly the gap between two scrolls. Since the larger gap declines the performance of the compression, the gap between wraps of scrolls or the gap between wraps of scrolls to the plate of the opposite scroll is regarded as an important design variable. This paper is focused on the effects of the thermal stress due to the materials changing. The temperature difference between the inlet and the outlet is about 60 degrees and the highest operating temperature in the compressor is less than 110 degrees. The level of thermal stresses in the magnesium scroll is less than the result from aluminum one. The trend of the deformation is revealed that the normal directional deformation is 2 times lager than the in-plane directional deformation. Therefore the gap between the top of the wrap to the plate of the opposite scroll become more important than the other gaps. The orbiting scroll deforms larger than the fixed scroll by the thermal stresses. The deformation of the magnesium scroll is about 10% lager than that of the aluminum scroll. This value is similar to the ratio of the coefficients of thermal expansion of two materials. At the initial design stage, the results give many useful guides to engineers to propose gaps between parts.
Al<sub>2</sub>O<sub>3</sub> 나노 입자를 적용한 증기 압축 냉동 사이클의 성능
김정배,이규선,이근안,Kim, Jeongbae,Lee, Kyu-Sun,Lee, Geunan 한국에너지학회 2015 에너지공학 Vol.24 No.4
$Al_2O_3$ 나노입자의 농도별로 전동식 압축기의 회전속도(rpm)의 변화에 따른 자동차용 증기압축 냉동사이클의 COP를 실험적으로 평가하고 나노입자를 적용하지 않은 기준 사이클의 COP와 비교하였다. 이를 위해 실제 하이브리드 자동차에서 쓰는 사이클 부품들을 이용하고 항온항습 챔버를 이용하지 않는 방식으로 장치를 설계 및 제작하였다. 별도의 전동식 인버터 압축기의 제어장치를 활용하여 1000rpm부터 500rpm 간격으로 4000rpm까지와 $Al_2O_3$ 나노입자를 질량비 기준으로 농도 0.05%, 0.1%, 0.2%와 0.5%의 범위에 대하여 실험을 수행하였다. 이를 통해 기준 사이클과 비교하면 기준 사이클의 일반적인 운전조건인 약 3000rpm에서 $Al_2O_3$ 나노유체를 적용하는 사이클의 COP는 질량 농도비 0.05%에서는 15.4% 정도, 농도비 0.1%, 0.2% 및 0.5%에서는 각각 9.4%, 13% 및 9.6%가 증가함을 알 수 있었다. An experimental study was performed estimating COP(Coefficient of Performance) of air-conditioning cycle using inverter scroll compressor with and without $Al_2O_3$ nano particle. All experiments were done for various compressor speeds from 1000~4000 rpm and used the inverter controller called CANDY to change the compressor rpm. The air-conditioning cycle components in the apparatus were used as same with components of YF hybrid car. To estimate the COP, this study measured the temperature and pressure at inlets and outlets of compressor, condenser, and evaporator. And also measured the compressor input power using Powermeter. Through the experiments, the maximum error to estimate COP was shown about ${\pm}6.09%$ at 3500rpm. The COP of refrigeration cycle with $Al_2O_3$ nano-particle was similar with that of the base cycle without nano-particle between 1000~3000 rpm of the compressor speed. But, This study showed that the COP of the cycle with $Al_2O_3$ over 3000 rpm of the compressor speed was higher than that of the base cycle due to the higher heat transfer rate increased in the evaporator from the higher oil flow rate inside the cycle as well known. Those results can be used the basic and fundamental data to design the air-conditioning cycle using inverter scroll compressor with $Al_2O_3$ nano particle.
비전 변형률 측정 시스템을 이용한 마이크로 박판소재의 물성평가 기술
이혜진,이낙규,최석우,이근안,신준희,김태주,주은덕 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
This paper is concerned with the precision material property measurement of a micro metal thin foil (Ni-99.9%) that is used in MEMS technology. Since these MEMS components require great precision and accuracy, evaluation of reliability such as the life cycle endurance test, impact test, and residual stress test is necessary for these components. However, in practice, real reliability tests are not easy to perform due to consideration of various factors. Rather than actual testing, it would be much easier to evaluate the reliability of components by the analytical approach. Although the analytical method is utilized by numerical software tools, it is obviously necessary to acquire fundamental properties of materials through real test methods. But the acquisition method of micro strain data is so difficult in micro tensile testing, because the micro tensile testing specimen has several micros thickness and small size of shape. So we research on the measurement method of micro strain data using a vision image analysis.