Showing 381 - 400 results of 2,815 for search '"helicopters"', query time: 0.13s Refine Results
  1. 381

    Using On-Board GPS to Identify Training Needs of Helicopter Pilots by Rien Visser, Andy Horcher

    Published 2011-01-01
    “…Because of the high cost of helicopter yarding, maximizing productivity is critical. …”
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  2. 382

    Social jet lag and its influencing factors in helicopter pilots by LIU Yan, YU Xin, GU Haowu, CHENG Baoquan, FENG Hua

    Published 2022-05-01
    “…Objective To investigate the current status of social jet lag (SJL) in army helicopter pilots and explore its influencing factors. …”
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  3. 383
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  5. 385

    A Double-Acting Piezoelectric Actuator for Helicopter Active Rotor by Jinlong Zhou, Linghua Dong, Weidong Yang

    Published 2021-09-01
    “…An active rotor with trailing-edge flaps is an effective approach to alleviate vibrations and noise in helicopters. In this study, a compact piezoelectric actuator is proposed to drive trailing-edge flaps. …”
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    Article
  6. 386

    Tracking Visual Scanning Techniques in Training Simulation for Helicopter Landing by Maxi Robinski, Michael Stein

    Published 2013-07-01
    “…Research has shown no consistent findings about how scanning techniques differ between experienced and inexperienced helicopter pilots depending on mission demands. To explore this question, 33 military pilots performed two different landing maneuvers in a flight simulator. …”
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    Article
  7. 387

    TO THE DEVELOPMENT OF AERODYNAMIC SHAPE OF MEDIUM SIZED PERSPECTIVE HELICOPTER FUSELAGE by V. A. Vershkov, M. S. Makhnev, D. V. Petrukhin

    Published 2017-01-01
    “…This paper presents the initial stage of work out of the helicopter body aerodynamic configuration. The main purpose of this work is to design the model of the fuselage and to minimize its drag.The analysis of experimental data obtained in TsAGI and other research centers was made at the first stage of the work. …”
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  8. 388

    Helicopter Takeoff and Landing Point Location in Cities for Emergency Services by Bin Hu, Xingyuan Chen, Songchen Han

    Published 2022-09-01
    “…In low-altitude rescue, civilian helicopters, relying on their speed, efficiency and flexibility, play at center stage. …”
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  9. 389

    Application of Results of Experimental Identification in Control of Laboratory Helicopter Model by Kamil Dolinsky, Anna Jadlovska

    Published 2011-01-01
    “…This article deals with experimental identification and control of laboratory helicopter model CE 150 manufactured by company Humusoft. …”
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  10. 390

    Experimental research of single - rotor helicopter unintentional yaw rotation by V. V. Efimov, V. A. Ivchin, O. E. Chernigin, K. O. Chernigin

    Published 2020-04-01
    “…The analysis of the experiments has shown that there is a range of sliding angles at a certain speed of the incoming air flow which makes the helicopter yaw balancing impossible, and if the helicopter occasionally gets into this range, it inevitably leads to the unintended rotation of the helicopter on the yaw occurrence. …”
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  11. 391
  12. 392

    Flap motion of helicopter rotors with novel, dynamic stall model by Han Wei, Liu Jie, Liu Chun, Chen Lei, Su Xichao, Zhao Peng

    Published 2016-01-01
    “…In this paper, a nonlinear flapping equation for large inflow angles and flap angles is established by analyzing the aerodynamics of helicopter blade elements. In order to obtain a generalized flap equation, the Snel stall model was first applied to determine the lift coefficient of the helicopter rotor. …”
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  16. 396

    Control Design of Mixed Sensitivity Problem for Educational Model of Helicopter by Stepan Ozana, Petr Vojcinak, Martin Pies, Radovan Hajovsky

    Published 2014-01-01
    “…It briefly introduces basic mathematical background concerning robust control approach, which is then applied for typical example of MIMO system, that is a helicopter model. The obtained results are verified on real educational physical model CE 150 by Humusoft, ltd.…”
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    Reduction of the vibration in a helicopter blade using piezoelectric actuators by Sergejs Gluhihs, Andrejs Kovalovs

    Published 2006-06-01
    “…A method to reduce vibration in a helicopter blade under a variable harmonic pressure loading using piezoelectric actuators is presented. …”
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    Article
  19. 399

    Stability Analysis of helicopter dynamics with incomplete information using MPC by Kudryavtseva Irina, Petrov Kirill

    Published 2022-01-01
    “…The paper is devoted to the problem of seeking a helicopter motion control using MPC provided that the state vector is not fully observable. …”
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