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titleSeparation motion analysis of sounding rockets using unbalanced YoYo mechanism
Other Title非対称YoYoを用いたロケットの分離運動
Author(jpn)石井 信明
Author(eng)Ishii, Nobuaki
Author Affiliation(jpn)宇宙航空研究開発機構 宇宙科学研究本部
Author Affiliation(eng)Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
Issue Date2005-03
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
Publication title平成16年度アストロダイナミクスシンポジウム:講演後刷り集
ISAS proceedings of 14th Workshop on Astrodynamics and Flight Mechanics 2004: A Collection of Technical Papers
Start page105
End page109
Publication date2005-03
AbstractAn unbalanced Yo-Yo mechanism is proposed in this paper so as to avoid collision of a solid rocket motor. In the S-310-35 rocket experiment, main purpose of which is to observe an auroral phenomena at Andoya, Norway, the unbalanced Yo-Yo is newly applied. The proposed Yo-Yo reduces, at first, the spin rate of the main body as a usual Yo-Yo despinner, then it gives tumbling moment to the main body as a Yo tumbler. The mechanism has different length of wires, one of them is approximately 2.4 m, and the other is about 5 cm longer. Weight of tip mass is 195 g each. In extending the wires, this mechanism reduces the initial spin rate of 2 Hz down to 1 Hz. After that, it gives 8 degrees of nutation angle to the main body due to the slightly different time of jettison of two wires. After the separation of the main body into two sections, the nutation angles of the payload section and the motor section decrease 0.5 degrees and 5 degrees, respectively. Because of the coning motion of the motor section, the return back trajectory of the motor is changed transversely. Eventually, more than 60 cm of clearance between two sections are estimated to be kept and the collision is to be avoided. This paper describes nutational motion analysis using the proposed Yo-Yo mechanism and also depicts a possibility of collision avoidance between the motor section and the payload section.
Keywordssounding rocket; collision avoidance; tumbling motion; nutation; Yo Yo mechanism; separation motion; spin rate; coning motion; 観測ロケット; 衝突回避; 回転運動; 章動; 非対称YoYo; 分離運動; 回転率; コーニング運動
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会

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