著者

小木曽 望 内海 智仁 室津 義定

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.50, no.586, pp.458-465, 2002 (Released:2003-09-02)

参考文献数

12

被引用文献数

1 1

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This study is concerned with a shape optimum design of a propeller blade operating in a low Reynolds number range, 1.0–2.0×105. The objective is to minimize the power-required under the constraints on the thrust and the angle of attack in terms of chord length and twist angle distributions where the power-required is evaluated by 3-D panel method. The profile drag is also considered in the optimization, because the effect cannot be ignored in a low Reynolds number range. For calculation efficiency, the profile drag coefficient is approximated by higher order polynomials in terms of Reynolds number and angle of attack. The effectiveness of the proposed method is demonstrated by the design of a propeller blade of a human-powered aircraft. Additionally, effect of the profile drag is discussed by comparing the designs with and without considering the profile drag.

著者

小木曽 望

出版者

The Institute of Electrical Installation Engineers of Japan

雑誌

電気設備学会誌 (ISSN:09100350)

巻号頁・発行日

vol.34, no.1, pp.60-65, 2014

著者

山田 将史 仲瀬 寛輝 小木曽 望 南部 陽介

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.21, pp.31-39, 2022 (Released:2022-07-12)

参考文献数

29

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Though our developed nano-satellite, HIROGARI released to orbit in March 2021 achieved the missions successfully until the end of 2021, the satellite encountered significant problems in the early operation stage. Because the satellite condition did not follow the expected behavior, the operation policy had to be decided with insufficient data. However, it was difficult to decide the operation policy rationally, since a nano-satellite has poor battery and communication margins. For the next nano-satellite development, this study constructed a resilient operation model for a nano-satellite using Systems-Theoretic Process Analysis (STPA) with lessons learned from operation experiences of HIROGARI. STPA is known as a new hazard analysis method that focuses on the interaction between a controller and the controlled object and that can be applied in conceptual design stage before detailed configurations are determined. The resilient operation model was constructed by considering the ground station as the controller and the satellite as the controlled target. Then, validity of adopting STPA to construct the operation model is discussed through comparing the unsafe control actions (UCA) and our lessons learned from operation of HIROGARI.

著者

仲 智彦 小木曽 望 木村 公洋 田中 宏明 Naka Tomohiko Kogiso Nozomu Kimura Kimihiro Tanaka Hiroaki

出版者

宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)

雑誌

第32回宇宙構造・材料シンポジウム:講演集録 = Proceedings of 32nd Symposium on Aerospace Structure and Materials

巻号頁・発行日

2016-12

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第32回宇宙構造・材料シンポジウム(2016年12月9日. 宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)), 相模原市, 神奈川県資料番号: SA6000087007レポート番号: A06

著者

小木曽 望 上馬場 雄太 岡田 侑樹 坂本 啓

出版者

一般社団法人日本機械学会

雑誌

年次大会 : Mechanical Engineering Congress, Japan

巻号頁・発行日

vol.2011, pp."J191013-1"-"J191013-5", 2011-09-11

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Design of a very precise space structural system requires an accurate estimation of uncertainties on structural and environmental parameters. For the purpose, high accurate estimations of uncertainties of the structural parameters and the effect of the paremeter uncertainties on the structural response uncertainty are required. Then, the robust design optimization based on the accurate estaimation is required. This study focuses on the former part, a high accurate estimation of the uncertainties. The applicability of a bootstrap method known as a nonparametric technique is investigated to estimate the confidence intervals of the uncertain parameters related to vibration responses of simple structures. The target structure is a cantileverd bow-shaped structure composed of beam and tether that is a breadboard model of a lightweight space reflector. The confidence intervals identified from several numbers of vibration tests is compared by the nonlinear finite-element analysis.

著者

小木曽 望

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.110, no.1064, 2007-07-05