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Comparison of Nonlinear Aeroelastic Methods for Maneuver Simulation of Very Flexible Aircraft

Ritter, Markus Raimund and Teixeira, Patricia C. and Cesnik, Carlos E. S. (2018) Comparison of Nonlinear Aeroelastic Methods for Maneuver Simulation of Very Flexible Aircraft. AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA Science and Technology Forum and Exposition, 8.-12. Jan. 2018, Kissimmee, Florida, USA.

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Abstract

This paper compares different methods and frameworks for the nonlinear aeroelastic simulation of very flexible aircraft, in particular for the X-HALE UAV configuration from the University of Michigan. The goal of this effort is the in-depth investigation of the influence of different aerodynamic methods with focus on elastic deformations and flight trajectories. Three state-of-the-art programs are applied. The first one is the UM/NAST aeroelastic toolbox from University of Michigan which uses both a corrected 2D strip theory aerodynamic model and, in its latest version, an unsteady vortex lattice solver together with a geometrically exact, strain-based beam formulation. The second one is an aeroelastic solver developed at the DLR Institute of Aeroelasticity. It uses an unsteady vortex lattice aerodynamic method and an extended modal approach for the structural dynamics solution. For selected test cases, the results of Nastran solution sequences SOL144 and SOL146 are used as additional references. The X-HALE UAV is the test case for the numerical studies in this work. Steady polars, unsteady aeroelastic gust responses, and a dynamic maneuver in free-flight with tail input are simulated. Emphasis is put on a systematic analysis of the differences that recent comparisons revealed for this test case. The findings show that the differences can be traced back to the strip theory aerodynamic method. Its drawbacks, in particular the nonconsideration of the aerodynamic interaction of different lifting surfaces, hamper the aeroelastic analysis of complex aircraft configurations such as the X-HALE.

Item URL in elib:https://elib.dlr.de/118375/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of Nonlinear Aeroelastic Methods for Maneuver Simulation of Very Flexible Aircraft
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ritter, Markus RaimundMarkus.Ritter (at) dlr.dehttps://orcid.org/0000-0003-3828-0397
Teixeira, Patricia C.pct (at) umich.eduUNSPECIFIED
Cesnik, Carlos E. S.cesnik (at) umich.eduUNSPECIFIED
Date:11 January 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Nonlinear Aeroelasticity, 2D Strip Theory, Vortex-Lattice, Very Flexible Aircraft, Numerical Flight Dynamics, Aeroelastic Simulation
Event Title:AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, AIAA Science and Technology Forum and Exposition
Event Location:Kissimmee, Florida, USA
Event Type:international Conference
Event Dates:8.-12. Jan. 2018
Organizer:American Institute of Aeronautics and Astronautics - AIAA
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 - VicToria
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Ritter, Markus Raimund
Deposited On:25 Jan 2018 13:54
Last Modified:25 Jan 2018 13:54

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