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RISS 인기검색어
- 검색키워드
- 저자 : Osamu Terashima (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Adhesion Properties of Transparent DLC Films on Polymer Substrates
Chiaki Terashima,Sang-min Baek,Tatsuru Shirafuji,Nagahiro Saito,Osamu Takai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
Transparent diamond-like carbon thin films were synthesized by doping of silicon-oxide using pulse-biased inductively coupled plasma chemical vapor deposition. Optical properties, mechanical properties, and adhesion properties of these films on polymer substrates such as polycarbonate were investigated on the effects of the gas composition and plasma pre-treatment. Silicon-oxide incorporated diamond-like carbon films on polycarbonate had favorable properties of higher deposition rate and wider optical band gap, although too much oxygen incorporation (O/C ratio > 0.15) brought about poor adhesion strength.
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Flow-induced Vibration of a High-speed Train Running in a Tunnel
Takeyuki KODERA,Hiroki NAGAI,Keisuke-ASAI,Osamu Terashima 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
In recent years, flow-induced vibration on the tail car of a high-speed train cruising in a tunnel has become a critical aerodynamic problem because it makes a ride comfort of the train poor. To further increase the train speed, it is required to identify the cause of this phenomenon and take necessary countermeasures. The objective of the present study is to clarify the effects of the tunnel wall on vibrations of a high-speed train running inside a tunnel. We conducted wind tunnel tests of a simplified train model with a flat plate simulating the effect of tunnel wall. Pressure transducers were used to measure unsteady pressure fluctuations on the tunnel wall and Pressure Sensitive Paint (PSP) was applied to measure time-averaged surface pressure distribution on the train model. In addition, we conducted Large Eddy Simulation (LES) calculation for the same model and test condition. In the experiment, pressure fluctuations with the Strouhal number similar to the actual case were observed near the tail car locations. The results of LES calculation indicated that LES could reconstruct the spectrum of pressure fluctuation that observed in the experiment. It was suggested from these results that the vibrations on the tail car were caused by the interaction of the flow separated from the tunnel side of the tail car with the tunnel wall.
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