日本航空宇宙学会誌

並進運動を伴う回転振動系の危険速度付近における挙動について

長島知有

1970 年 18 巻 196 号 p. 167-177
発行日: 1970年
公開日: 2009/05/25

DOIhttps://doi.org/10.2322/jjsass1969.18.167

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In a coupled rotational vibration system, there may exist some characteristic nature so called self-excited instability which imply a relaxational transformation of rotational energy of the system into its translational one.
As it is difficult to treat such an instability phenomena in general, a similar coupled tow degrees of freedom system is taken up and some theoretical investigations to clarify the dynamic behaviours of this system are undertaken.
In this paper, the author succeeds to develop one useful method for constructing graphical solutions of such an autonomous two degrees of freedom system upon the reduced phase plane.
Applying this method to the concerned system, the dependency of its dynamic behaviours of the system to its initial state is clearly understood and also the periodic solutions which may exsit in this system can be detected as the closed trajectories on that phase plane.
The periodic solutions of this kind are also decided by the perturbation method and the FOURIER expansion method.
Each result of this graphical or analytical method is compared with that of analogue simulations of the system and the validity of these methods is justified.

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アスペクト比の小さい翼列の性能

第1報翼のスパン中央における性能

大塚新太郎, 林省吾

1970 年 18 巻 196 号 p. 178-184
発行日: 1970年
公開日: 2009/05/25

DOIhttps://doi.org/10.2322/jjsass1969.18.178

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Performances of the compressor type cascade of blades with small aspect ratio AR were experimentally obtained at the center of blade span. All blades had same span of 50mm and their aspect ratio were 2.08, 1.39, 1.04 and 0.83. Stagger angle (α) was changed from 0° to 60° and attack angle (α_i) from 0° to 15°. Results indicate that total pressure loss coefficient takes a minimum value at AR_??_1 irresspectively of α and α_i. At α_i over about 5° turning angle (ε) increases and at α_i=0° it decreases gradually with increasing AR. Axial velocity ratio, in the case α=0°, decreases gradually with incresing AR, and in the case α=30° it keeps almost constant value irrespectively of AR at α_i=constant, but in cases α=50° and 60° it increases at α_i≥5-10° with increasing AR.

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科学観測のための宇宙飛行計画

長友信人, 松尾弘毅

1970 年 18 巻 196 号 p. 185-195
発行日: 1970年
公開日: 2009/05/25

DOIhttps://doi.org/10.2322/jjsass1969.18.185

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全日本空輸株式会社,日本航空機製造式YS-11型,JA 8658

事故調査報告書

1970 年 18 巻 196 号 p. 196-206
発行日: 1970年
公開日: 2009/05/25

DOIhttps://doi.org/10.2322/jjsass1969.18.196

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