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이영도(Young Do Lee),설재완(Jea Wan Soel),주병윤,임성한(Sung Han Rhim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6
In this study, we have designed and developed proto type machine that is able to form a pattern forming using isostatic pressing and have progressed a pattern forming on the plates and curved plates In this study to research a pattern forming of a newly proposed process, we determined a decision creteria by filling ratio. PMMA material progressed plate forming using polymer die. we research for bending, torsion, and forming quality of materials that while it is plate forming, and suggest to prevent bending, and torsion, and changing geometry of material aspects.
최영도(Young-Do Choi),쿠로카와준이치(Junichi Kurokawa),김유택(You-Taek Kim),이영호(Young-Ho Lee) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
Recently, greenhouse effect by CO² gas emitted by use of fossil fuel causes earth environmental problem. As a countermeasure of the global warming, small hydropower becomes the focus of attention for its clean and renewable energy sources. Newly developed positive displacement hydraulic turbine shows high efficiency and good applicability for the small hydropower range. The purpose of this study is to clarify the influence of leakage loss and effective head on the performance of the positive displacement hydraulic turbine for the further improvement of the turbine performance. The results show that the turbine, with a smaller side clearance, has much higher efficiency than that with bigger side clearance and it can sustain the high efficiency under the wider range of operation conditions. Pressure in the chamber is equal to the averaged value of inlet and outlet pressures. Sudden pressure decrease by accelerated through-flow between lobe and casing wall results in torque loss.