著者

Takahiro SASAKI Hiroyuki OKAMOTO Yu NAKAJIMA Ryo NAKAMURA Toru YAMAMOTO

出版者

International Symposium on Space Technology and Science

雑誌

Journal of Evolving Space Activities (ISSN:27581802)

巻号頁・発行日

vol.1, pp.52, 2023 (Released:2023-06-30)

参考文献数

17

---

Considerable research is being directed toward active debris removal (ADR) in space, especially by small, cost-effective satellites. In the descent phase, thrust vector control (TVC) is often utilized to maintain the satellite’s trajectory and thrust vector by gimbaling the thrust vector. A common challenge in performing TVC is that its effectiveness depends on the mass, moment of inertia and location of the thrusting point with respect to the center of mass. Since these properties change with fuel consumed during a mission, a designer needs to consider such parameters as they strongly affect the resulting dynamics. This paper introduces spacecraft dynamics with a gimbaled thruster and proposes an adaptive controller for TVC with model uncertainties. Through numerical examples, the effectiveness of the proposed controller is demonstrated for improved control performance.

著者

岡本 洋幸 林 麗如 筑田 眞 Hiroyuki Okamoto Rijo Hayashi Makoto Chikuda 獨協医科大学越谷病院眼科 獨協医科大学越谷病院眼科 獨協医科大学越谷病院眼科 Department of Ophthalmology Koshigaya Hospital Dokkyo Medical University Department of Ophthalmology Koshigaya Hospital Dokkyo Medical University Department of Ophthalmology Koshigaya Hospital Dokkyo Medical University

雑誌

Dokkyo journal of medical sciences (ISSN:03855023)

巻号頁・発行日

vol.40, no.3, pp.185-188, 2013-10-25

---

Werner 症候群は老人様顔貌,強皮症様皮膚変化,若年性白内障を特徴とする疾患である.発症は100 万人あたり3~45 人とされている.今回,われわれは白内障術後10 年以上経過したにも関わらず強膜創の閉鎖不全が感染の原因と考えられる眼内炎の症例(41 歳,男性)を経験した.Werner 症候群には白内障を合併することが多く,術後も創傷治癒は遅延しやすいため感染のリスクが高い.眼科的な長期の経過観察が必要と考えた.