Results 151 to 160 of about 692 (185)

Aeroelastic tailoring for gust load alleviation

, 2016
Aerospace Structures & Computational ...
Lancelot, P.M.G.J. (author), De Breuker, R. (author)   +1 more
openaire   +2 more sources

Active hinged wingtip for gust load alleviation and manoeuvres

AIAA SCITECH 2023 Forum, 2023
The development of lighter and more efficient transport aircraft has led to an increasedfocus on gust load alleviation. A recent consideration in aircraft design is using hinged wingtip devices to increase the aspect ratio, improving aircraft performance.
Davide Balatti, JAMES ELLIS, Shakir Jiffri, Hamed Haddad Khodaparast, Michael Friswell   +4 more
openaire   +3 more sources

Gust load alleviation based on model predictive control

, 2013
Weight reduction is a typical design goal for modern aircraft. If gust encounters (as required by Certification Specification 25) are sizing conditions of parts of the airframe, this can be achieved (for example) by an active gust load alleviation system that reduces the gust load level down to the level of the next design condition, which might be the
Giesseler, Hans Gerd, Faulwasser, Timm, Varutti, Paolo, Findeisen, Rolf   +3 more
openaire   +1 more source

Passively actuated spoiler for gust load alleviation

, 2016
This paper summarises a conceptual study regarding a passively actuated spoiler for gust load alleviation. The design of such system is intended to limit the use of computers, sensors and actuators to operate the device. The study mainly relies on using Theodorsen’s unsteady flow theory for a typical airfoil section.
Lancelot, P.M.G.J. (author), De Breuker, R. (author)   +1 more
openaire   +2 more sources

Application of Active Flow Control Technique for Gust Load Alleviation

Chinese Journal of Aeronautics, 2011
A new gust load alleviation technique is presented in this paper based on active flow control. Numerical studies are conducted to investigate the beneficial effects on the aerodynamic characteristics of the quasi “Global Hawk” airfoil using arrays of ...
Xiaoping Zhu
exaly   +2 more sources

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Structural optimization for gust load alleviation

7th AIAA/USAF/NASA/ISSMO Symposium on Multidisciplinary Analysis and Optimization, 1998
The subject of this paper is gust load alleviation through structural optimization methods. It explains some of the ways that gust loads can threaten the safety of a flight, and also describes the accepted way of characterizing gusts. In particular, the random nature of a gust and the associated simplifying assumptions in order to make the problem ...
V. Tischler, V. Venkayya
openaire   +1 more source

Prediction of gust loadings and alleviation at transonic speeds

27th Structures, Structural Dynamics and Materials Conference, 1986
Abstract : The transonic indicial theory is used to predict the effect of a gust on an airfoil at transonic speeds. The effect of operating two control surfaces is also modeled by the indicial method. The transonic indicial mehtod is linear in a strained coordinate system and superposition can be used.
David Nixon, Keh Lih Tzuoo
openaire   +2 more sources

Aircraft Design with Maneuver and Gust Load Alleviation

29th AIAA Applied Aerodynamics Conference, 2011
of maneuver (MLA) and gust load alleviation (GLA) systems on aircraft performance are evaluated at the conceptual design level. Results suggest that a conventional transonic transport aircraft designed with an aggressive aerodynamic MLA system may achieve some 3% lower direct operating cost (DOC) and more than 4% reduction in fuel consumption relative ...
Jia Xu, Ilan Kroo
openaire   +1 more source

Gust Load Alleviation on a Large Transport Airplane

Journal of Aircraft, 2016
This study develops an active control technology to reduce the incremental dynamic loads of a large four-engine transport airplane flying through a gust field. The mathematical model of the proposed gust-alleviation system features composite structural motions (for example, rigid-body motions, elastic vibrations, and deflections of control surfaces ...
Yonghui Zhao, Chengyu Yue, Haiyan Hu
openaire   +1 more source

Hybrid adaptive control for gust load alleviation

2015 34th Chinese Control Conference (CCC), 2015
This paper develops a hybrid adaptive control (HAC) framework based on fast block least mean square (FBLMS) algorithm for gust load alleviation (GLA). Currently, the GLA control system is usually focusing on the alleviation of structural vibration of aircraft caused by turbulence perturbation.
Bian Qi, Li Ting, Qin Yuemei, Peng Cheng
openaire   +1 more source