日本航空宇宙学会論文集
Online ISSN : 2432-3691
Print ISSN : 1344-6460
ISSN-L : 1344-6460
59 巻 , 694 号
選択された号の論文の5件中1~5を表示しています
論文
  • 石森 雄一郎, 中根 昌克, 石川 芳男, 吉田 洋明, 山口 雄仁
    2011 年 59 巻 694 号 p. 291-297
    発行日: 2011年
    公開日: 2011/12/01
    ジャーナル フリー
    This paper investigates and compares the effect that the airframe configuration and installed engine have on the feasibility of a space plane. For this purpose, multi-disciplinary optimization of the aerodynamic shape and ascent flight path of the airframe was carried out assuming two types of airframe configurations, single stage to orbit (SSTO) and two stage to orbit (TSTO), and two types of propulsion systems, turbine-based combined-cycle (TBCC) and rocket-based combined-cycle (RBCC). The optimization calculation was performed using the stochastic process optimization technique (SPOT) that we have proposed. In this study, to reduce the computational load, the airframe weight and aerodynamic performance are estimated based on historical statistics. According to the results of the optimization, the TSTO configuration equipped with a RBCC engine had the highest feasibility. Sensitivity analysis was carried out for the time history of the angle of attack, and the structure of the characteristic solution space that reflects the airframe configuration and the installed engine was clarified. As a result, the importance of steering controls for each flight condition could be assessed.
  • 原田 正志, 小竹 祥太, 白鳥 敏正
    2011 年 59 巻 694 号 p. 298-305
    発行日: 2011年
    公開日: 2011/12/01
    ジャーナル フリー
    In design method of open propellers, the distribution of circulation that gives the highest propulsive efficiency was obtained by Goldstein by satisfying the requirement of ``Betz's condition'' in late 1920s. On the other hand, any theoretical optimum design method of ducted fan has not been developed yet though the use of ducted fans by UAV, VTOL, etc., has increased in recent years. We developed the design method that gives the distribution of circulations with highest efficiency in the configuration of ``ducted propeller.'' The key point of this design method is that it is mathematically proven that the solution obtained by this method is the unique global optimum solution. In addition, the optimized blades here had wide tip chord as expected.
  • 蔭山 康太, 福田 豊
    2011 年 59 巻 694 号 p. 306-312
    発行日: 2011年
    公開日: 2011/12/01
    ジャーナル フリー
    Punctuality gives an indication of delay from schedule on aircraft operation. Improvement of punctuality is one of the important topics for future ATM (Air Traffic Management) plans. To improve punctuality, it is indispensable to comprehend current state of delay. In this paper, delay analysis results from actual data of Japanese aircraft operation are presented. Firstly, punctuality on Japanese principal airports is studied. In addition, the punctuality is studied seasonally and weather impact on punctuality is briefly discussed. Moreover, aircraft operation is divided into the four phases to study delay in detail. Defining standard times, delay is computed for each phase. To spot the operation phases that incurred longer delay, the computed delays are compared.
研究ノート
feedback
Top