著者
砂本 大造
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会誌 (ISSN:00214663)
巻号頁・発行日
vol.23, no.255, pp.205-212, 1975-04-05 (Released:2009-05-25)
参考文献数
18
被引用文献数
1 1
著者
東野 和幸 杉岡 正敏 小林 隆夫 湊 亮二郎 丸 祐介 笹山 容資 大塚 雅也 牧野 隆 坂口 裕之
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 (ISSN:13446460)
巻号頁・発行日
vol.57, no.664, pp.210-216, 2009 (Released:2009-06-01)
参考文献数
10
被引用文献数
3 2

Liquid Natural Gas (LNG) will be used as propellant of near future space vehicles and rocket engines. Cooling characteristics of engines, especially methane thermal cracking characteristics depend on material candidate for nozzle and chamber cooling passage material temperature. This paper describes these effects on coking and sample analysis method is suggested.
著者
奥村 哲平 増井 博一 豊田 和弘 趙孟 佑 今泉 充
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 (ISSN:13446460)
巻号頁・発行日
vol.55, no.647, pp.590-596, 2007 (Released:2007-12-27)
参考文献数
14
被引用文献数
6 7

Electrostatic discharge (ESD) occurs on the solar array due to space plasma interaction. It is considered that solar cell suffers degradation of electric performance, once ESD occurs at the solar cell edge. In order to study the degradation of solar cell electrical performance, we performed ESD tests on Si solar cell in a vacuum chamber. After the ESD tests the solar cell maximum power decreased. We found the damage on surface electrode in the vicinity of ESD spot. Infrared emission due to current leak was found at the spot. The solar cell degraded due to the leak resistance produced by ESD.
著者
小林 繁夫 長島 利夫
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会誌 (ISSN:00214663)
巻号頁・発行日
vol.34, no.389, pp.332-339, 1986-06-05 (Released:2009-05-25)
参考文献数
10
被引用文献数
1 1

Three subjects are studied for the vibration characteristics of laminated graphite-epoxy cylindrical shell. Firstly the eigen-value problem is exactly solved to obtain the natural frequency of layered composite cylindrical shell by use of Flugge type vibration equation. In the case of two layer crossply and angle-ply laminates the coupling effect decreases the fundamental natural frequency about 20%. For four layer antisymmetric cross-ply and angle-ply, the natural frequency is close to the one of the thickness-wise homogeneous cylindrical shell. However in the case of symmetric four layer crossply the lamination constitution unexpectedly affects the fundamental natural frequency. The natural frequency is explicitly obtained using Donnell type vibration equation of orthotropic cylindrical shell for the S2 boundary condition and the influence of lamination constitution is clarified. The optimum lamination constitutions for the highest fundamental natural frequency are disclosed. It is shown that the quasi-isotropic lamination is not optimal. The influence of lamination constitution on the nonlinear property of resonance curve for the fundamental natural frequency of the shell is analytically studied. It is concluded that the nonlinear property is softening for all laminations and the degree of the softening is stronger in the order of the circumferential layer alone, the ±45° angle-ply, the cross-ply, the quasi-isotropic and the axial alone.
著者
藤田 和央
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 (ISSN:13446460)
巻号頁・発行日
vol.52, no.610, pp.514-521, 2004 (Released:2005-01-05)
参考文献数
11
被引用文献数
9 13

The air breathing ion engine (ABIE) is a new type of electric propulsion system which can be used to compensate the aerodynamic drag of the satellite orbiting at extremely low altitudes. In this propulsion system, the low-density atmosphere surrounding the satellite is taken in and used as the propellant of ion engines to reduce the propellant mass for a long operation lifetime. Since feasibility and performance of the ABIE are subject to the compression ratio and the air intake efficiency, a numerical analysis has been conducted by means of the direct-simulation Monte-Carlo method to clarify the characteristics of the air-intake performance in highly rarefied flows. Influences of the flight altitude, the aspect-ratio of the air intake duct, the angle of attack, and the wall conditions are investigated.
著者
佐藤 昌之 村岡 浩治 穂積 弘毅 眞田 幸尚 山田 勉 鳥居 建男
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 (ISSN:13446460)
巻号頁・発行日
vol.65, no.2, pp.54-63, 2017 (Released:2017-04-05)
参考文献数
10
被引用文献数
1 1

This paper is concerned with the design problem of preview altitude controller for Unmanned Airplane for Radiation Monitoring System\nobreakspace {}(UARMS) to improve its control performance. UARMS has been developed for radiation monitoring around Fukushima Dai-ichi nuclear power plant which spread radiation contaminant due to the huge tsunamis caused by the Great East Japan Earthquake. The monitoring area contains flat as well as mountain areas. The basic flight controller has been confirmed to have satisfactory performance with respect to altitude holding; however, the control performance for variable altitude commands is not sufficient for practical use in mountain areas. We therefore design preview altitude controller with only proportional gains by considering the practicality and the strong requirement of safety for UARMS. Control performance of the designed preview controller was evaluated by flight tests conducted around Fukushima Sky Park.
著者
磯貝 紘二
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会誌 (ISSN:00214663)
巻号頁・発行日
vol.44, no.511, pp.461-465, 1996-08-05 (Released:2010-12-16)
参考文献数
33
被引用文献数
3 2
著者
明神 絵里花 渡慶次 幸治 長谷 日出海 宮本 裕行 若林 野花
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会誌 (ISSN:00214663)
巻号頁・発行日
vol.61, no.10, pp.340-345, 2013-10-05 (Released:2017-06-15)

準天頂衛星システムは,「準天頂軌道」という日本のほぼ天頂(真上)を長時間滞在する軌道をもつ人工衛星を複数機組み合わせた衛星システムであり,現在米国が運用中のGPS信号と互換性のある測位信号を送信することで,日本国内の山間部や都心部の高層ビル街などでも,衛星測位できる場所や時間を広げることができるという日本独自の衛星測位システムである.JAXAは準天頂衛星システムの第一段階(技術実証・利用実証段階)として,準天頂衛星初号機「みちびき」(2010年9月11日打上げ)とそれを運用する地上システム(高精度測位実験システム及び追跡管制システム)を整備した.測位衛星ならではの要求である航法メッセージ(測位地上系で生成)の常時(24時間365日)アップロードを実現するため,追跡管制システムは既存のJAXA地上設備とは別に「みちびき」専用システムを整備した.本稿では,「みちびき」の追跡管制システムの概要ならびに開発結果について報告する.
著者
平野 正隆 宮路 幸二
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 (ISSN:13446460)
巻号頁・発行日
vol.52, no.611, pp.535-540, 2004 (Released:2005-02-25)
参考文献数
8
被引用文献数
1 1

A wing rock is known to be a self-excited rolling oscillation of a delta wing that is induced by unsteady aerodynamic forces. In this study, free-to-roll simulations are carried out by incorporating time-accurate computational fluid dynamics with an equation of motion of a wing. A limit cycle oscillation and the histogram of a hysteresis in the rolling moment, which has four peaks within one cycle, are successfully simulated. The strength of the leading-edge vortices at a fixed roll angle is rather different from that during the wing rock especially at large angular velocities and that causes the characteristics behavior of the unsteady moments.
著者
菊池 隼仁 久原 隆博 中村 和行 森下 直樹 鳥居 航 徳永 翔 大槻 真嗣 橋本 樹明
出版者
一般社団法人 日本航空宇宙学会
雑誌
航空宇宙技術 (ISSN:18840477)
巻号頁・発行日
vol.20, pp.59-68, 2021 (Released:2021-06-23)
参考文献数
10

OMOTENASHI is a CubeSat that will be launched by NASA SLS rocket. Its mission is to demonstrate that a CubeSat can make a semi-hard landing on the Moon. The 6U-size spacecraft, which weighs 12.6kg, and consists of an orbiting module (OM), a rocket motor (RM) for deceleration on approach to the moon, and a surface probe (SP) as the landing module. Under tight resource constraints, a unique structure and separation mechanism is designed for a small space and a low mass. A validity of these designs has been verified through a vibration test. The margin of safety under the launch vibration is calculated by the structure analysis. In addition, to increase the impact resistance, all components of SP are filled with an epoxy resin. This performance had been evaluated by the drop impact test. As the result, this test model endured more than 16,158G with no function failure. In this paper, the design overview and test results are described.