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Free-Flight Nonlinear Aeroelastic Simulations of the X-HALE UAV by an Extended Modal Approach

Ritter, Markus Raimund and Jones, Jessica and Cesnik, Carlos E. S. (2017) Free-Flight Nonlinear Aeroelastic Simulations of the X-HALE UAV by an Extended Modal Approach. IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics, 26.-29. Jun. 2017, Como, Italien.

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A recently proposed method that extends the classical modal approach captures geometrically nonlinear effects in large structural deflections. The extensions account for nonlinear force displacement relationship by generalized quadratic and cubic stiffness terms and a geometrically nonlinear displacement field by quadratic, cubic, and fourth-order mode components. These extensions make the method particularly suitable for aeroelastic applications involving highly flexible structures and nonlinearities due to nonconservative loads. In this work, the method is enhanced by rigid body degrees of freedom to simulate a maneuvering, very flexible aircraft. Special emphasis is put on the derivation of a set of coupled differential equations of motion in which as few assumptions as possible are made with respect to structural deformations. The use of the mean-axes constraints is explicitely avoided, all inertial and gyroscopic coupling terms between rigid body and elastic motion are included. The setup of the aeroelastic framework based on an unsteady vortex-lattice method in the time doamin is presented in detail. University of Michigan's X-HALE UAV is the test case of this work. The results of dynamic maneuvers including tail input scenarios and gust encounters are presented and compared with results from UM/NAST.

Item URL in elib:https://elib.dlr.de/118369/
Document Type:Conference or Workshop Item (Speech)
Title:Free-Flight Nonlinear Aeroelastic Simulations of the X-HALE UAV by an Extended Modal Approach
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ritter, Markus RaimundMarkus.Ritter (at) dlr.dehttps://orcid.org/0000-0003-3828-0397
Jones, Jessicajrenejo (at) umich.eduUNSPECIFIED
Cesnik, Carlos E. S.cesnik (at) umich.eduUNSPECIFIED
Date:26 June 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:very flexible aircraft, nonlinear flight dynamics, nonlinear aeroelasticity
Event Title:IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics
Event Location:Como, Italien
Event Type:international Conference
Event Dates:26.-29. Jun. 2017
Organizer:Politecnico di Milano, Associazione Italiana di Aeronautica e Astronautica AIDAA
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 (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Ritter, Markus Raimund
Deposited On:25 Jan 2018 13:53
Last Modified:24 Jun 2019 16:01

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