- 著者
- Tomohiro YAMAGUCHI Makoto YOSHIKAWA
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN (ISSN:13473840)
- 巻号頁・発行日
- vol.7, no.ists26, pp.Pk_11-Pk_15, 2009 (Released:2010-05-08)
In this paper, the estimation method of impact probability for Near-Earth Objects (NEOs) is investigated. The impact probability of NEOs has been calculated by a linear target plane analysis and a Monte-Carlo method. Since the collisions of NEOs with the Earth are quite sensitive problems, the calculations have to be confirmed by everal methods. A linear target plane analysis cannot be applied if the position uncertainty is too large since the uncertainty ellipsoid is not a good assumption in this case. A Monte-Carlo method can be used for a large position uncertainty, but the computational cost is high. The limitation of using a linear target plane analysis is investigated using the Monte-Carlo method for the close approach of 99942 Apophis (2004 MN4). The relation between impact probability and observation accuracy is investigated by analyzing the close approach of 2007WD5.
- 著者
- Hiroshi SASAKI Takane IMADA Shinichi TAKATA
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN (ISSN:13473840)
- 巻号頁・発行日
- vol.7, no.ists26, pp.Tk_77-Tk_82, 2009 (Released:2010-08-06)
- 被引用文献数
- 1
The H-II Transfer Vehicle (HTV) is an unmanned transfer vehicle that will rendezvous with manned facilities and deliver up to six tons of cargo. HTV is a key space transportation system technology in Japan together with the H-IIA/H-IIB launch vehicle and is designed to fully satisfy the manned safety requirements of the International Space Station (ISS) program. Therefore, the technology and its system acquired through HTV development and operation will be widely utilized in future manned transportation and lunar and planetary exploration missions.
- 著者
- Takane IMADA Michio ITO Shinichi TAKATA
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN (ISSN:13473840)
- 巻号頁・発行日
- vol.7, no.ists26, pp.Tg_35-Tg_44, 2009 (Released:2009-11-28)
- 被引用文献数
- 1 1
HTV (H-II Transfer Vehicle) is the first Japanese un-manned service vehicle that will transport several pieces of equipments to ISS (International Space Station) and support human activities on orbit. HTV will be launched by the first H-IIB rocket in September 2009 and JAXA will have the capability to access LEO (Low Earth Orbit) bases with enough volume/weight as the human transport system. This paper is the preliminary study for developing a manned spacecraft from the HTV design and includes clarification of necessary development items. In addition, missing parts in the current HTV design are identified with some analysis, such as LES (Launch Escape System), which is mandatory for all human transport systems.
- 著者
- KOMATSU Mitsuhito NAKASUKA Shinichi
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN (ISSN:13473840)
- 巻号頁・発行日
- vol.7, no.26, pp.Tf_19-Tf_24, 2009
- 被引用文献数
- 2 5
ISSL is now developing a new super small satellites for Earth remote sensing, "PRISM". This satellite has a unique optics system with flexible extensible boom, aiming at 30m ground resolution. Super small remote sensing satellite can be used for the low-cost global Earth observation missions. To achieve such high ground resolution with flexible telescope, it has some compensation strategies against structural errors or dynamic movement. This satellite will be launched with GOSAT by H-IIA rocket in 2008, and we have finished FM development phase. This paper describes its key concepts and features of PRISM, as well as the problems we encountered and the methodologies for project management by university students.
- 著者
- 葛山 浩 小紫 公也 桃沢 愛 荒川 義博
- 出版者
- THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
- 雑誌
- TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN (ISSN:13473840)
- 巻号頁・発行日
- vol.1, pp.9-16, 2003
- 被引用文献数
- 5 14
エンジンサイクル解析を用いて,パルスレーザーラムジェット機のSSTO打ち上げの検討が行われた. 高々度では,多くのレーザーエネルギーが化学反応凍結流によって失われるが,重量100kg,断面積 1m<sup>2</sup>程度の機体にたいして,100MW程度のレーザーパワーでレーザーラムジェット機をSSTO打ち上げ 可能であることがわかった. また,エンジンサイクル解析により得られた運動量結合係数Cmを, CFDを用いて得られたCmと比較することでその妥当性を検討した. 結果として,エンジンサイクル解析はCmを過小評価していることがわかった. この理由は,実際の加熱過程における強い非定常なエネルギー入力と機体のafterbody上での 空間的にローカライズされた圧力上昇のためであると考えられる.