ETS-VIII, Large deployable reflector, Space structure, Thermal deformation, Finite element analysis
その他のタイトル（英）
Numerical investigations on thermal deformation of large deployable reflector in space durine earth ecipse (1st report, fundamental investigations to suppress thermal deformation and thermal deformation analysis
Graduate school, University of Tsukuba
Japan Aerospace Exploration Agency (JAXA)
University of Tsukuba
出版者
日本機械学会
出版者（英）
The Japan Society of Mechanical Engineers
雑誌名
日本機械学会論文集
雑誌名(英)
Transactions of the JSME (in Japanese)
巻
81
号
830
ページ
15-00351
発行年
2015-10-25
抄録（英）
Space structures encounter various severe environments in space. One of these environments is severe thermal condition where the difference of temperature during day-time and night-time is about 200 degrees Celsius. A signal level of radio wave from the Large Deployable Reflector (LDR) mounted on the Engineering Test Satellite-VIII (ETS-VIII) was observed to change during the Earth eclipse. This phenomenon was assumed to be caused by thermal deformation of the LDR. It was not a critical issue for the ETS-VIII because the communication beam from the LDR tended to spread in the wide range. However, highly accurate pinpoint communication beams are expected to be required in the future, and this transition of the beams may affect the performance of such satellites. Therefore, we tried to seek out the means to suppress the thermal deformation mechanically by focusing into the internal force generated at springs used to deploy the antenna. Furthermore, we simulated the thermal deformation behaviour in the original model of the antenna. According to the analyses in the single module model, the deformation at central side of upper radial member is almost suppressed by controlling the spring force if constraint conditions are pin and pin-roller constraint at center axis member. On the other hand, if the constraint condition is perfect constraint at longitudinal member, this means has no effect in suppression of the deformation at peripheral side of upper radial member, although the deformation at central side of it is almost suppressed. According to the thermal deformation analysis of the original model, deformation occurred towards normal direction of the reflector surface during thermal transition. Moreover, the midpoint of the LDR was confirmed to deform for about 5[mm] which explained the phenomena actually observed on the ETS-VIII.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
日陰時における宇宙用大型展開アンテナの熱変形補正に関する数値解析的検証(第1報、熱変形補正の基礎的検討および熱変形再現解析)
