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RISS 인기검색어
- 검색키워드
- 저자 : Kazuhito Fujiwara (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Stability Control of Small Kite Balloon with Tensioned Anchoring Rope
Kazuhito Fujiwara,Tetsuyuki Hiroe,Hidehiro Hata 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A small captive balloon have been studied in order to get the information of local meteorology. We have tried to keep the designed altitude of a small captive balloon against the wind drag by controlling attack angle generating its lift force. Then the geometry of an ellipsoid has been focused for the balloon body rather than a spheroid that was used generally. The controlling attack angle is a passive way where elastic extendable cables are used to limit the inclination of balloon. The characteristics of cables were properly selected in order that the balloon could have the effective attack angle against the wide wind velocity. The controlling technique worked well unless the balloon was caught by unstable flow like a gust. In this study, we propose a method to keep the altitude of a captive balloon by the above technique in stable flow, and by changing tension of the anchoring rope periodically in unstable flow. Some artifices including a small change of the balloon geometry increased the stability of the attitude, and the successive tensioning was effective to restrain the rolling and falling. of the balloon in severely unsteady flow.
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The study on change of mechanical properties of NBR due to deterioration
Chika Umino,Yusuke Arao,Yuma Otsuka,Fumiko Kawashima,Kazuhito Fujiwara 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
Rubber is an important industrial material. However, mechanical properties and deformation of the high polymer including rubber are not clear. A method of estimating the mechanical properties which can be used for the deteriorated rubber is demanded to improve the reliability of it. Improved VBO (Viscoplasticity theory based on overstress) model is a constitutive equation. We applied it for the compression stress-strain behavior of deteriorated NBR (acryloNitrile-Butadiene rubber). Furthermore, we proposed a method of estimating the mechanical properties of deteriorated NBR. In this paper, deterioration tests in water and in air were conducted. To confirm the validity of the proposed improved VBO model and estimated mechanical properties, simulations of the stress-strain curves obtained in the tests were conducted.
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