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실험계획법에 의한 자동차용 러버실 금형가공을 위한 총형공구의 최적설계
이여해,임표,이희관,양균의,Lee, Li-Hai,Lim, Pyo,Lee, Hi-Koan,Yang, Gyun-Eui 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.4
A bearing is one of core parts in automobile. Rubber seal of the bearing is important to improve performance of bearing, formed by hot-press die of rubber seal for the intricate shape. In this study, formed tools are used to machine die of bearing rubber seal and the machining operation is classified into the several process of high precision. Design of experiments is used to optimize selection of the formed tools for the efficient machining of the hot-press die. The cutting force, tool wear and tool life are determined to characteristics. And, the clearance angle, the rake angle and the length cutting edge are considered as the major factors. Experiments are repeated to use one-way factorial design, and tool life is predicted by regression model.
수직형 풍력터빈의 출력에 따른 유동 소음 특성에 관한 수치해석 연구
이여해(Yeohae Lee),전완호(Wan-Ho Jeon),임태균(Tae-Gyun Lim),이상문(Sang-Moon Lee),장춘만 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
As environmental problems such as the continued depletion of fossil fuels and climate change are arising, the interest towards clean energy has been growing exponentially. Among renewable energies, the fact that wind energy is relatively advanced in terms of technology, easier to build, and economically feasible, has allowed it to develop commercially. The installation of small wind turbines has been growing particularly in insular areas in order for them to become energy self-sufficient. Commonly for small-scale wind power generation, a vertical axis wind turbine is used since it does not require any yaw system, for it is not affected by the wind direction. While this fact can be a big advantage, the near-by residents’ health problems due to the turbine’s low frequency noise and other noises are often reported. Hence, this study is to analyze the characteristics of flow noise through the numerical analysis of Darrieus type vertical axis wind turbine installed in Deokjeok-do, Incheon. In this research, we categorized the turbine’s RPM into five cases and analyzed specifically focusing on low frequency noise.