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Open and closed loop gust loads analyses for a flying wing configuration with variable longitudinal stability

Voß, Arne (2019) Open and closed loop gust loads analyses for a flying wing configuration with variable longitudinal stability. Aerospace Science and Technology, 89, pp. 1-10. Elsevier. DOI: 10.1016/j.ast.2019.03.049 ISSN 1270-9638

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Official URL: http://www.sciencedirect.com/science/article/pii/S1270963819302548

Abstract

This work presents results of dynamic “one-minus-cosine” gust load simulations for a flying wing configuration. The in-house toolbox Loads Kernel is used for the loads analysis of the free flying aircraft. Flight mechanical characteristics are captured by application of a non-linear equation of motion in the time domain. The underlying aerodynamic methods are the Vortex Lattice and the Doublet Lattice Method with a rational function approximation (RFA) for unsteady simulations in the time domain. The structural model was created using DLR's parametric ModGen/Nastran design process. The structure is optimized for minimum structural weight with typical design load cases including maneuver, gust and landing loads. In this article, the focus lies on gust encounters and the flight characteristics of a flying wing configuration. It differs from classical configurations (wing-fuselage-empennage) due to a pronounced nose-up pitching motion when the aircraft enters the gust field. Finally, a flight controller is designed to increase the pitching stability. This is essential for the flight of a naturally unstable configuration. It is shown that the loads during a gust encounter increase significantly. The influence on the structural weight is small as the layout is very robust and the required material thickness is below the minimum thickness in most areas.

Item URL in elib:https://elib.dlr.de/127072/
Document Type:Article
Title:Open and closed loop gust loads analyses for a flying wing configuration with variable longitudinal stability
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Voß, ArneArne.Voss (at) dlr.dehttps://orcid.org/0000-0003-2266-7853
Date:1 April 2019
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:89
DOI :10.1016/j.ast.2019.03.049
Page Range:pp. 1-10
Publisher:Elsevier
ISSN:1270-9638
Status:Published
Keywords:flying wing, gust loads, closed loop, structural optimization
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Voß, Arne
Deposited On:15 Apr 2019 15:16
Last Modified:15 Apr 2019 15:16

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