著者

木村 勉 田中 真 遠山 文雄

出版者

東海大学工学部

雑誌

東海大学紀要 工学部 (ISSN:05636787)

巻号頁・発行日

vol.44, no.2, pp.73-78, 2004

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As human activities in space increase, the hazard of space debris impacts becomes an ever more serious concern. In particular, breakups of artificial objects increase space debris. Debris of more than 10 cm in diameter have been detected by ground-based radars and optical observations. The orbital data of these objects are cataloged by NASA. This paper describes the orbital analysis of space debris generated by breakups. We analyzed orbital data for the 4th stage engine of the Indian PSLV rocket, the Russian COSMOS 1813, and the Chinese CZ-4 rocket. As a result of this study, we developed a new determination method of the breakup time.

著者

岩田 達夫

出版者

東海大学

雑誌

東海大学紀要 工学部 (ISSN:05636787)

巻号頁・発行日

vol.31, no.2, pp.p107-111, 1991

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A new method for measuring vacuum pressure by field emission microscopy is described The relationship between the time constant of exponential decay of field emission current caused by the adsorption of residual gas and the ambient pressure has been derived and examined. The method allows to measure the pressure below x-ray limit of the conventional Bayard-Alpert ionization pressure gauge.

著者

平岡 克己 岡田 諭士 新井 啓之

出版者

東海大学

雑誌

東海大学紀要 工学部 (ISSN:05636787)

巻号頁・発行日

vol.43, no.1, pp.53-58, 2003

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At the Fukuoka airport under strong wind, a veteran worker, who was checking the rock pin of the bulk cargo door of an MD'll airplane, fell down. In order to investigate the relationship of this fall accident and strong wind, a wind tunnel experiment and numerical computations using Fluent were carried out. Using a 1/100 scale model of the airplane, velocity distribution was measured by a hot wire probe. Calculating the three-dimensional inviscid incompressible flow, a flow field was obtained. It was shown that when there is a side wind against the airplane axis, a strong blow with complex vortices occurs on the leeward rear side of the fuselage. It is considered that such a strong wind broke down the worker's balance and led to the fall accident.