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  • Chang-Joo KIM, Sang Kyung SUNG, Chang Deok YANG, Yung Hoon YU
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
    2008年 51 巻 173 号 184-192
    発行日: 2008年
    公開日: 2008/11/14
    ジャーナル フリー
    This paper deals with the State-Dependent Riccati Equation (SDRE) method for designing a rotorcraft flight controller. It focuses on the design of the SDRE controller when a highly complex rotorcraft mathematical model is used. The requirements of the rotorcraft model are investigated to design the SDRE controller and to validate the final designs. Since the SDRE method can be applied to a deterministic system, adequate fidelity in the rotorcraft mathematical model is crucial to guarantee controller performance. However, a complex mathematical model generally prevents us from analytically deriving the State Dependent Coefficient (SDC) form of the system equations, which conforms to the basic structure of the SDRE method. This paper proposes a pure numerical procedure for SDC factorization of the motion equation. The numerical methods available to solve the algebraic Riccati equation are selected to cope with the inherent system instability and are applied to the trajectory tracking problems. The overall feature of the present approach is highlighted through analysis of a
    bob
    -
    up
    and turn maneuver. The results can be utilized as a guide for appropriate selection of rotorcraft mathematical models and numerical methods in designing a robust SDRE controller.
  • Chang-Joo KIM, Jaewoo LEE, Young Hwan BYUN, Yung Hoon YU
    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
    2008年 51 巻 171 号 43-51
    発行日: 2008/05/04
    公開日: 2008/06/01
    ジャーナル フリー
    This paper deals with a nonlinear optimal control approach to helicopter inverse simulation. The reference trajectory is prescribed in prior, and the integral deviation from this trajectory is treated as an additional penalty cost to convert the system optimality to an unconstrained optimal control problem. The resultant two-point boundary value problem has been solved by a multiple-shooting algorithm. The nonlinear helicopter model in this study includes main rotor flap dynamics and a dynamic inflow model. The applications cover the inverse simulation for
    bob
    up
    , turn, and slalom maneuvers. This paper focuses on resolving the convergence issue using the indirect method, the main root causes of which are related to the inherent system instability of the helicopter and with poor initial guesses on state and costate variables. For this reason we will investigate the effect of the shooting node number on convergence and use a hybrid-model approach, where the optimal state and costate variables, calculated using the linear model, are used as initial guesses for those using the nonlinear model. The analyses show good convergence history and capability of tracking the prescribed trajectory. So the results in this paper can provide a valuable motivation for applying indirect methods to nonlinear helicopter flight mechanic analysis.
  • 内田 誠之, 森下 進, 三宅 慶明
    日本機械学会論文集 B編
    2001年 67 巻 663 号 2905-2910
    発行日: 2001/11/25
    公開日: 2008/03/28
    ジャーナル フリー
    The power response is a very important characteristic for the aircraft engine. Especially for the helicopter, engine power response is essential to the safety at an emergency condition. Here, a new idea of increasing the power response dramatically, with the combination of centrifugal compressor and variable inlet guide vanes, is studied and the verification test results using a small turbo shaft engine is described.
  • Terry J. Donaldson
    魚類学雑誌
    1995年 42 巻 3-4 号 311-319
    発行日: 1995/11/25
    公開日: 2010/06/28
    ジャーナル フリー
    西部太平洋に生息するベラ科魚類である, ヤシャベラ, シチセンベラ, クロヘリイトヒキベラ, Cirrhilabrus katherinae, Oxycheilinusunifasciatus, Pteragogus cryptus, およびコガシラベラの求愛・産卵行動を記載した.コガシラベラではグループ産卵が, のこりの6種ではペア産卵が観察された.配偶システムは, ハレム的グループ, 乱婚, グループ産卵につながるレック的行動, あるいは偶発的単婚であった.さらに求愛行動らしいものとして, メガネモチノウオでは1尾の雄と数尾の雌によるパレード行動が, ギチベラでは雄によるパトロール行動が観察された.ここで確認された異なる行動パターンは, 将来, ベラ科魚類の系統関係を分析し, その行動の進化経路を確かめる際に有用であると思われる.
  • 龍口 直太郎
    英文学研究
    1931年 11 巻 3 号 362-375
    発行日: 1931/07/10
    公開日: 2017/04/10
    ジャーナル フリー
  • ――川端康成「たんぽぽ」の文体と身体をめぐって――
    平井 裕香
    比較文学
    2020年 62 巻 66-80
    発行日: 2020/03/31
    公開日: 2022/04/30
    ジャーナル フリー

     Kawabata Yasunari's last novel Dandelions centers on a young woman, Ineko, and her battle with “somagnosia", a fictional illness which makes it appear that other people's body is disappearing. At the end of the novel, Ineko becomes unable to see her lover Kuno, suggesting that “somagnosia" is a representation of the novel's style, which combines internally and externally focalized narratives. Accordingly, this paper examines the relationship between style and the body in Dandelions. The absence of a grammatical subject, a common aspect of the Japanese language, is tacitly used to evoke a sensation of an absent subject. Dandelions then adds complexity to this sensation by its unique usage of auxiliary verbs and multiple character's voices.

     To demonstrate this, this paper first analyzes Ineko's father's death scene, in which the narrative is both internally and externally focalized on Ineko, expressing the complicated nature of her fears, which are caused by both visual and non-visual perceptions as well as memories. This paper then argues that the scene can be interpreted as an internally focalized narrative of Kuno and/or Ineko's mother, who heard about the death from Ineko. The text thus grants an independent, singular presence to certain motifs, such as the rock that Ineko's father hit as he fell. Finally, this paper asserts that Ineko's mother's perception of Ineko's skin is a good example of this particular type of presence. The relationship between the mother's words and body illustrates the complexity of bodily sensation as represented by the narrative style of Dandelions.

  • アレルギー
    2021年 70 巻 6-7 号 705-727
    発行日: 2021年
    公開日: 2021/09/30
    ジャーナル フリー
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