日本航空宇宙学会誌

宇宙用次世代データ情報システムと Electro-Optics

姉川弘, 西山建志

1991 年 39 巻 452 号 p. 438-449
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.438

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フライバイライト要素技術の開発状況と将来展望

真柳光美

1991 年 39 巻 452 号 p. 450-457
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.450

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光通信用部品の光データバスへの応用

須川毅, 村上泰典, 田部久仁男

1991 年 39 巻 452 号 p. 457-464
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.457

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受動型光ジャイロの研究開発動向

保立和夫

1991 年 39 巻 452 号 p. 464-472
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.464

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クローズドループファイバジャイロ

黒河明広

1991 年 39 巻 452 号 p. 473-477
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.473

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平板後退翼の非圧縮非定常空気力のステップ応答とそのモデル化

鈴木真二, 門田公秀

1991 年 39 巻 452 号 p. 478-484
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.478

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This paper considers approximating unsteady aerodynamic forces acting on a plane swept wing in the time domain. Time responses of the aerodynamic forces caused by a step movement of a wing in incompressible flow are calculated by using the time domain vortex element method. It was found that transient characteristics of the step responses associated with a certain generalized aerodynamic force can be represented by one decreasing function regardless of wing motions. By approximating each decreasing function with a set of exponential functions and by calculating apparent mass coefficients and steady state forces, a mathematical model for the aerodynamic forces in the form of 1st-order linear time-invariant differential equations (the state equations) is obtained. The accuracy and the applicability of the method have been confirmed through the comparison between the approximated aerodynamic forces and the unsteady forces calculated directly in the time domain or measured experimentally.

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毛細管力による管内気液界面の移動のダイナミックス

市川直樹, 里田洋子, 中田毅

1991 年 39 巻 452 号 p. 485-490
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.485

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This paper describes the dynamics of liquid driven by capillary force in a tube. The movement of a gas-liquid interface in a horizontal tube as a result of capillary action has been investigated. A theoretical analysis of the interface dynamics is presented where dimensionless numbers representing time and distance scales are introduced, and a unique functional relation is derived. Experiments were carried out with distilled water as the test liquid in glass tubes of inner diameter from 0.5mm to 4.0mm. The position of the gas-liquid interface as a function of time was observed. The experimental results agree well with theory.

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波状壁面上を飛ぶ2次元翼の空力特性の差分解法

新田恭子, 安東茂典, 和久浩行

1991 年 39 巻 452 号 p. 491-495
発行日: 1991/09/05
公開日: 2010/12/16

DOIhttps://doi.org/10.2322/jjsass1969.39.491

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The lift on an airfoil flying over a wavy wall surface is calculated using a finite difference method, which was developed by J. Nakamichi to improve LTRAN2 evolved by W. F. Ballhaus and P. M. Goorjian. Numerical computations include cases of a flat plate over a flat solid wall prior to the cases of a moving wavy wall. Modification of grid generating system is the major point for applying the LTRAN2 version to our problem. The weak compressibility (M_∞=0.1-0.3) is considered but nonlinearity is neglected in our calculations. The calculated results are compared with those obtained by the lifting surface theory of M. Ichikawa et al. The agreements are quite satisfactory.

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