JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

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Other TitleSurvivability of tethers for geostationary SPS against collisions with space debris
Author(jpn)平山 寛; 花田 俊也; 佐々木 進
Author(eng)Hirayama, Hiroshi; Hanada, Toshiya; Sasaki, Susumu
Author Affiliation(jpn)九州大学; 九州大学; 宇宙航空研究開発機構 宇宙科学研究本部
Author Affiliation(eng)Kyushu University; Kyushu University; Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
Issue Date2006-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title第25回宇宙エネルギーシンポジウム 平成17年度
The Twenty-fifth Space Energy Symposium March 10, 2006
Start page45
End page49
Publication date2006-06
AbstractA method to estimate survivability of tethers against collisions with space debris is described in this paper. It was applied to a tether which is designed to stabilize attitude of a geostationary solar power satellite. ISAS has a conceptual design of solar power satellite which uses four tethers with end mass to stabilize its attitude. The tethers are assumed to be thin tapes because they seem more tolerant against collisions with space debris than conventional cylindrical strings. Their dimensions are 10 mm in width, 0.5 mm in thickness and 10 km in length. The satellite will be operated in GEO and required lifetime is 30 years. Characteristics of space debris in GEO are analyzed before the calculation of the survivability. The results shown validity of simplifications that most of effective objects are natural meteoroids with hypervelocity, incoming elevation angles are approximate to zero, and so on. Fatality rate for the cylindrical tether can be calculated by integrating product of effective cross section of the tether and flux of debris. Tape-tethers will easily twist, so that cross section of them to the incoming debris can be described as mean cross section around azimuth angle. After that, survivability of the tape-tethers can be calculated with same method for cylindrical tethers. According to results of the calculation, the survivability of the tape tether after 30 years is not sufficient, 66 percent for single tether, 19 percent for four tethers. Another result implies that increasing the width of the tape will effectively improve the survivability.
Keywordsspace debris; tethered satellite; tethering; solar power satellite; attitude stability; spacecraft stability; hypervelocity impact; collision cross-section; meteoroid; 宇宙デブリ; テザー衛星; テザリング; 太陽発電衛星; 姿勢安定性; 宇宙機安定性; 極超音速衝突; 衝突断面積; 流星物質
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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