日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
49 巻 , 575 号
選択された号の論文の6件中1~6を表示しています
論文
  • 吉川 浩行, 太田 照和
    専門分野: その他
    2001 年 49 巻 575 号 p. 407-411
    発行日: 2001年
    公開日: 2002/04/26
    ジャーナル フリー
    In the present paper, the dynamic behavior of a rotor supported by externally pressurized liquid hydrogen bearing is theoretically investigated. The bearing treated in this study has 20 recesses arranged in two rows in a staggered manner and will be used in the liquid hydrogen turbopump of rocket engines for space transport systems. The equations of motion for a rotor are numerically solved using predictor-corrector scheme. The dynamic bearing reaction forces are calculated from the numerical solution of unsteady turbulent Reynolds lubrication equation. The transient responses of hydrostatic bearing under several operating conditions are presented. Furthermore, the journal center trajectories with imbalanced moment are examined theoretically.
  • 熊田 和也, 西畑 教英, 小林 修
    専門分野: その他
    2001 年 49 巻 575 号 p. 412-418
    発行日: 2001年
    公開日: 2002/04/26
    ジャーナル フリー
    Fixed based flight simulator experiments were conducted to investigate the influences of wideness of front view for pilot's roll control. In these experiments, the airplane's motion was considered as a single-degree-of-freedom system in roll, and three front views having different view-angle were provided. The results of these experiments showed that the pilot's roll control characteristics, and the pilot's sensing parameter and reaction time for rolling motion were influenced by the differences of wideness of front view in flight simulator.
  • 小林 修
    専門分野: その他
    2001 年 49 巻 575 号 p. 419-424
    発行日: 2001年
    公開日: 2002/04/26
    ジャーナル フリー
    This paper discusses a static stability theory for airplanes. The conventional definitions of static stability are neither clear nor systematic. On the basis of these situations, in the first report of this paper, a system of definitions on 6 static stability concepts was proposed, and two concepts of static flight-velocity stability and static angle of attack stability were studied. And in the second report, a concept of static pitch stability was discussed. This third report discusses on the three static stability concepts in sideslip, roll and yaw, and proposes that “dY/dβ<0, ” “dR/dΦ<0” and “dN/dΨ<0” should be used as the fundamental definitions, where R means rolling moment. The general criteria for these static stabilities are deduced from these definitions. From these criteria, “C<0, ” “C/C>0” and “C>0” are obtained as the stable conditions. Finally, this report represents the whole summary of this paper.
  • 石田 洋治
    専門分野: その他
    2001 年 49 巻 575 号 p. 425-431
    発行日: 2001年
    公開日: 2002/04/26
    ジャーナル フリー
    We have developed a numerical method for design of minimum-drag supersonic wing thickness with constraints on total volume and wing maximum thickness position. The method is based on the linearized supersonic theory and is an extension of Kawasaki's method which deals only with total volume constraint. The maximum thickness position of the wing, a new constraint condition, is an important information from both aerodynamic and structural point of view. The addition of the constraint has considerably extended the design possibility and has actually produced many interesting optimum thickness families. Numerical examples are given for delta, gothic and arrow wings which confirm the usefulness of present design method.
  • 河野 功, 杢野 正明, 鈴木 孝, 小山 浩, 功刀 信
    専門分野: その他
    2001 年 49 巻 575 号 p. 432-437
    発行日: 2001年
    公開日: 2002/04/26
    ジャーナル フリー
    Engineering Test Satellite-VII (ETS-VII) is a test satellite to perform in-orbit demonstration of autonomous rendezvous docking (RVD) technology, which will be necessary for advanced space activities in the early 21st century. ETS-VII successfully performed the autonomous RVD by unmanned space vehicle for the first time in the world. For an unmanned space vehicle to perform rendezvous to a manned spacecraft, safe approach is needed. So we paid special attention to designing safe approach trajectory. There are other important points for approach trajectory design, for instance, coordination with guidance and control accuracy, performance of navigation sensors, and operability, etc. In this paper, we introduce the points, and show the result of ETS-VII RVD trajectory design.
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