著者
菅野 秀樹 片柳 亮二
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.43, no.498, pp.405-414, 1995-07-05 (Released:2010-12-16)
参考文献数
5
被引用文献数
1 2

Pilot-Induced Oscillation (PIO) was encountered in the company flight test of the T-2CCV research vehicle. The main cause of the roll PIO was due to unexpected large pilot input and to increased delay of the aircraft response by its large pilot input. The delay of roll response has much difference between with large input and with small input. That is why the flight control system falls into nonlinear system by actuator rate limit in case of controlling the aircraft with large pilot input. This paper shows analysis of the characteristics of the PIO and its improvement.
著者
山名 正夫
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空学会誌 (ISSN:00214663)
巻号頁・発行日
vol.14, no.149, pp.170-176, 1966-06-05 (Released:2009-07-09)
参考文献数
8

The phenomenon of "Hitodama", a fairly popular term from ancient in Japan and probably corresponding to will-o'-the-wisp, is studied from the viewpoint of combustion of gases. The viewpoint has come out of the examination on nearly 100 actual examples mostly observed by the acquaintances of the author. An experimental simulation is tried in a wind-tunnel, in which the setup is so devised that the mixing of methane and surrounding air is caused merely by interdiffusion. A long, horizontal column of methaneair mixture thus formed is ignited to establish a propagating flame. The observed flames take three representative types; long one with a ringshaped head, one with a conically-grooved head, and spherical one with a short tail, according to the concentration profile in the column. The analytical investigation gives calculated shapes of methane flames which are in a fairly good agreement with observed ones.
著者
澤井 秀次郎 松田 聖路
出版者
一般社団法人 日本航空宇宙学会
雑誌
宇宙技術 (ISSN:13473832)
巻号頁・発行日
vol.1, pp.1-10, 2002 (Released:2002-10-23)
参考文献数
5

宇宙科学研究所の観測ロケットS-520の姿勢制御への適用を前提に,適応型ノッチフィルターを利用した制御器を提案した.著者らは,動翼モジュールと呼ばれる円筒部を実際に試作し,ハードウェア試験を含む各種検証を実施している.本稿では主に,この動翼モジュールに実装された適応型ノッチフィルターを利用した制御器について論じた. ロケットの動特性は本質的に時変系であるため,たとえば構造1次振動モードも時間とともに変化する.これを従来の時不変の線形制御器を用いて制御すると,振動モードの不確定性に対して十分な安定マージンを確保するためには応答性能を犠牲にせざるをえないケースがあった.それに対して,本稿では,励起された振動モードに自動的に適応していくノッチフィルターを定式化し,これと従来型の時不変制御器を組み合わせることを提案した.数値シミュレーションなどの結果,本提案の有用性が確認された. 著者らは提案した制御器を実フライトに供することができる試作品に実装済みである.本稿では,試作品を用いて実施した試験についても,一部論じた.
著者
中谷 辰爾 野村 俊貴 引地 悠太 田中 信太郎 崔 敏鎬 今村 宰 津江 光洋 富岡 定毅
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.61, no.6, pp.151-158, 2013 (Released:2014-06-27)
参考文献数
38

Experiments on the effects of thermally cracked components of n-dodecane on the ignition and the combustion performance of a scram jet model combustor at Mach 2 were performed. Gaseous components of the thermally cracked n-dodecane at various temperature and 1MPa were measured by a gas chromatograph. Surrogate mixtures including hydrogen, methane, ethane and ethylene were injected into the supersonic air stream in the model combustor, and ignition and combustion behaviors were investigated at total temperatures of 1800 to 2400K. Pressure measurements on the combustor wall and optical observations of combustion using a high speed video camera were conducted. Results indicated that three combustion modes of intensive, transient and weak combustions were observed. Ignition was observed in the boundary layer positioned at the downstream of the cavity, and the flame propagated upward to the cavity. The ignition performance of ethylene was superior to methane and ethane, and their performances were elucidated from the reactivities predicted by a 0-dimensional calculation of chemical reactions for stoichiometric mixtures. An increase in the methane concentration reduced the ignition performance, and an increase in ethylene enhanced the ignition and combustion.
著者
沢田 雅洋 山下 博 岩崎 俊樹 大林 茂
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.58, no.681, pp.295-301, 2010 (Released:2010-10-27)
参考文献数
14

Research of Long-Distance Human-Powered Flight has been performed through the following four items: Aircraft design, Risk management, Pilot performance, Weather prediction. Actual flight took place on August 12, 2009. The flight distance was 20.72km. In this study, results of weather prediction using 1-way downscaling technique are validated by surface observation data and feasibility of weather prediction for Long-Distance Human-Powered Flight is discussed. The weather prediction with 1-km mesh decreases RMSE of wind speed by 0.1--0.2m/s compared with that with 5-km mesh. The weather prediction with 1-km mesh also has a potential to reproduce nonstationary wind. The RMSE gradually increase with time, which is mainly caused by initial and boundary data given from coarse mesh model. To reduce the RMSE, it is desirable to use newest analysis data as possible for initial and boundary data.
著者
安平 浩義 小野 航大 平山 和樹 指田 春輝 池田 裕哉 飯島 拓人 吉岡 宙 佐原 宏典 飯塚 俊明 石井 宏宗 岡島 礼奈
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.22, pp.62-70, 2023 (Released:2023-09-20)
参考文献数
21

This paper introduces Microsatellite-Friendly Multi-Purpose Propulsion (MFMP-PROP) we proposed as a promising propulsion system using low-toxic propellant for microsatellite, clarifies the development policy and positioning of MFMP-PROP among a variety of propulsion system for microsatellites, and reports the current status of its systemization with the corresponding test results. In addition, the high scalability of MFMP-PROP also makes it suitable for a wide range of missions with microsatellites of 2U to 50kg class. Though the performance of MFMP-PROP is not up to the designed value at present because of too large propellant supply in a prototype of MFMP-1U, this will be solved by optimization of the piping or adding flow adjustment elements. We will continue to further systemize MFMP-PROP and conduct environmental tests to achieve an early space demonstration and utilization.