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Control Allocation of Flexible Aircraft for Load Alleviation [PDF]

, 2021
As wing designs aim for higher aerodynamic efficiency, the underlying aircraft structure becomes more flexible, requiring additional features to alleviate the loads encountered from gusts and maneuvers. While alleviating loads, it is desirable to minimize the deviations from the original flight trajectory.
Hansen, John
openaire   +3 more sources

Gust and Maneuver Load Alleviation in Conceptual Aircraft Design

, 2023
Load alleviation technologies are a promising approach to increase the fuel burn efficiency. Ideally, they should be taken into account already in the early design phase, where the geometry shape is defined.
Krengel, Markus Dino, Hepperle, Martin
openaire   +3 more sources

Investigation of load alleviation in aircraft pre-design and its influence on structural mass and fatigue [PDF]

Aerospace Science and Technology, 2022
This work elaborates an aircraft pre-design process that integrates loads analysis, load alleviation, structural optimization and fatigue analysis. The consideration of maneuver and gust load alleviation in early design stages is a promising concept to ...
Vega Handojo
exaly   +2 more sources

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Alleviation of design loads by synthesizing evaluation function

Proceedings of the 41st SICE Annual Conference. SICE 2002., 2003
In the early phase of a design process, conceptualization and preliminary refinement are important processes in deciding the quality of a product; however, their implementation in computer systems is difficult. Interactive evolutionary computation (IEC) has provided us a solution to this problem by ignoring the designer's load of interacting with the ...
Shiose, Takayuki, Ishida, Ryohei, Nakayama, Yoshihito, Taura, Toshiharu   +3 more
openaire   +1 more source

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

Load Alleviation Control vs. Load Limiting Control: Pros and Cons.

Proceedings of the Vertical Flight Society 78th Annual Forum and Technology Display, 2022
The development of life extending control schemes is important to ensure the longevity of critical helicopter components. Perhaps, equally important is the ability to choose the appropriate component life extension scheme for a specific application.
Chams Eddine Mballo, J.V.R Prasad
openaire   +1 more source

Structural load alleviation

Transactions of the Institute of Measurement and Control, 1987
Aircraft having flexibility can develop large amplitude acceleration due to structural modes, in addition to that caused by the rigid body motion. Reduction of these loads by means of active control systems is an important problem in flight control. Load alleviation control by means of full state variable feedback, obtained as a solution to an eigen ...
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Experimental and Numerical Investigation of an Autonomous Flap for Load Alleviation

Journal of Aircraft, 2017
This paper presents the design, a numerical aeroservoelastic investigation, and an experimental proof of concept of an autonomous flap system.
Bernhammer, L.O. (author), Navalkar, S.T. (author), Sodja, J. (author), De Breuker, R. (author), Karpel, M (author)   +4 more
openaire   +3 more sources

Aircraft load alleviation by robust yaw-lateral decoupling

Automatica, 2003
In an aircraft the pilot reaction is to reduce the yaw rate by a high rudder deflection. But the pilot delay causes high loads at the vertical tail. Here, a new pilot assistance control system is proposed for the yaw disturbance moment compensation. The system is unilaterally decoupled in the sense that the yaw rate reduction is performed robustly and ...
Michael Kordt, Jürgen Ackermann
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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   +1 more source