Trajectories and Dynamics for the Recovery of Space Vehicles of Gemini Capsule Type

• Material Type: 文書・図像類
• Title: Trajectories and Dynamics for the Recovery of Space Vehicles of Gemini Capsule Type
• Author/Editor: 森, 英彦; MORI, Hidehiko
• Author Heading: 森, 英彦; MORI, Hidehiko
• Publication, Distribution, etc.: 航空宇宙技術研究所
• Publication Date: 1981-01
• Publication Date (W3CDTF): 1981-01
• Alternative Title: ジェミニ型カプセル飛しょう体の回収における軌道とダイナミクス
• Periodical title: 航空宇宙技術研究所報告 = Technical Report of National Aerospace Laboratory TR-651
• No. or year of volume/issue: 651
• Volume: 651
• Pages: 47-
• ISSN (Periodical Title): ISSN : 0389-4010
• Text Language Code: eng
• Target Audience: 一般
• Note (General): The Gemini capsule has excellent characteristics for reentry, although the configuration is very simple. It is beneficial to know how the vehicle parameters of Gemini are related to the reentry characteristics, not only for capsule design, but also for conceptual study of other types of reentry vehicles. Our purpose has been to obtain, through analytic methods, the basic data concerning trajectories and dynamics for the recovery of Gemini from space. At the same time we have tried to refine those methods. Euler Hill eqations were applied to determine the direction of retro thrust, and then to calculate the approximate time and range for recovery. Along this trajectory, Kepler motion was compared with the results of a rigorous simulation of the trajectory, in order to investigate the effects of drag of the upper atmosphere and the effects of the main zonal term of gravity potential. In the atmospheric region, Chapman’s equations were used to get general characteristics for reentry and the solutions were again compared with the results of the rigorous simulation. Our analysis has proved that the accuracy of Chapman’s equations is improved by adding a short term which compensates for the effects of the atmosphere rotating with the earth. The aerodynamic aspects of the capsule are well explained by Newtonian flow theory. Using this theory and the flight data of Gemini XII, equations of motion for pitching and stability derivatives were derived. Then the required control thrust level for damping in pitch was figured out. Decreasing dynamic pressure in the latter part of reentry results in negative damping in pitching motion. In cases where a control force is not available, this tendency leads to an unstable pitching motion as the effects combined with positive damping-in-pitch parameter Cm’α+Cm’β, which occurs frequently for reentry vehicles. Ericsson’s methods were applied to derive the damping-in-pitch parameter analitically, and a proposal for static methods of measuring it is presented. This study has been performed in connection with a paper under the title of a conceptual study of the Gemini capsule-a bio-experimental satellite application-which is to be presented in the near future.; 資料番号: NALTR0651000; レポート番号: NAL TR-651
• Source: https://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=44907&item_no=1&attribute_id=31&file_no=1
• Access Restrictions: 限定公開
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ