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파워스티어링 오일탱크의 유체-구조 연성해석에 관한 연구
장병춘,양동욱 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.2
Most of the commercial vehicle steering system is hydraulic. In this system, Breakage and leakage of oil tank is the cause of serious problems to inhibiting the vehicle direction control of the driver. Inthis paper, FSI(Fluid-Structure Interaction) analysis was performed considering the sloshing of oil in the tank for structural safety evaluation of the power steering oil tank. Additionally, vibration analysis of simple and fast evaluation method was performed by assuming the fluid to mass. As a result, sloshing analysis of oil in the tank was confirmed from the FSI vibration analysis, and it could get the distribution of the flow pressure 8.2kPa~-5.5kPa. Second, stress change of the FSI vibration analysis results was greater in the 33.6MPa to 0.25MPa during the transitional period 2cycle, then it showed a stable result. Third, maximum stress of FSI vibration analysis considering sloshing of the oil was 2.22MPa. maximum stress of vibration analysis assuming the fluid to mass was 4.50MPa and 103% higher than the FSI vibration analysis, but the oil tank was safely evaluate structurally safety factor 14.1. Finally, without the FSI vibration analysis by applying a weight of 0.5 to the result of vibration analysis assumes fluid to mass, it could be obtained results similar to FSI vibration analysis.
장병춘,김가을 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.6
LED industry in the world, is rapidly emerging as an important policy means of each countries for climate change, saving energy and international environmental regulations. And incandescent bulb regulatory policy in each country is the role of growth catalysts for the LED lamp industry, it is expected to increase research and investment for the LED package in the future. However, In spite of the growth of the LED lamp industry, the price of the world LED lamp has been declining more than 30% per year and it is accelerating further. Therefore, an alternative techniques for high performance and cost reduction of the LED lamp has been studied. In this study, we studied the aluminum extrusion product inserted heat sink as a one of the alternative techniques which can improve the thermal efficiency and reducing costs. As a result, radiant heat effect was improved around 44.5% higher than the thermally conductive resin heat sink.
장병춘,박무언,Jang, Byoung-Choon,Park, Moo-Eon 한국토양비료학회 1997 한국토양비료학회지 Vol.30 No.2
벼 품종간 Sr-85의 흡수와 작물체 부위별 분포, 그리고 토양으로부터 작물체로 전이되는 Sr-85의 전이계수를 조사하기 위하여 a/2000 pot에 사양토를 공시토양으로 하여 일품벼(만생종)와 오대벼(조생종)를 공시하고 건조토양 1g 당 Sr-85를 각각 무처리, 74Bg과 222Bq를 처리하여 수행한 결과는 다음과 같다. 1 수확기에 일품벼와 오대벼의 Sr-85의 흡수율은 각각 0.39-0.43%, 0.66-0.73%로 오대벼의 흡수율은 전반적으로 일품벼보다 약 1.5배 많았다. 2. 토양으로부터 흡수된 Sr-85의 대부분은 볏짚과 왕겨에 축적되었으며 현미로 전류된 량은 약 1.3%에 불과 하였다. 3. 벼 부위별 Sr-85 농도는 Sr-85 처리량에 따라 높았으며 오대벼는 일품벼보다 모든 부위에서 높은 농도를 보였다. 4. 두 품종에서의 토양-식물체간 전이계수는 품종간 유의성은 없으나 현미 0.037과 볏짚 4.13의 범위였으며 부위별 전이계수는 볏짚>왕겨>현미 순으로 높았다. 5. 토양으로부터 흡수한 Sr-85는 벼의 생장과 수량에는 영향을 미치지 않았다. To investigate the absorption and transfer factor(TF) of Sr-85 by rice(Oryza sativa L.), experiments were carried out through pot cultivations on a sandy-loam soil treated 74 and 222Bq per gram of soil in a plastic film house. Sr-85 absorption rates of Ilpoombyeo, late maturing variety and Odaebyeo, early maturing variety, at harvesting stage, were 0.39-0.43% and 0.66-0.73%, respectively. Sr-85 absorption rates of Odaebyeo were about 1.5 times higher than those of Ilpoombyeo. Ratios of Sr-85 radiation and Sr-85 concentration in brown rice were much lower compared with those in straw and husk. Sr-85 concentrations in each part of Odaebyeo were remarkably higher than those of Ilpoombyeo. Transfer factor of Sr-85 from soil to plant ranged from 0.037 of brown rice to 4.13 of rice straw at harvesting stage. The order of the Sr-85 transfer factor in plant parts was straw>husk>brown rice. Sr-85 concentrations treated in soil had no effect on the growth and yield of rice.