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A FEM-Based Approach for Nonlinear Aeroelastic Trim of Highly Flexible Aircraft

Riso, Cristina and Di Vincenzo, Fausto G. and Ritter, Markus Raimund and Cesnik, Carlos E. S. and Mastroddi, Franco (2017) A FEM-Based Approach for Nonlinear Aeroelastic Trim of Highly Flexible Aircraft. IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics, 26.-29. Juni 2017, Como, Italien.

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A novel approach is presented to compute nonlinear aeroelastic trim of highly flexible aircraft by coupling off-the-shelf solvers for structures and aerodynamics. The methodology includes an inertia relief algorithm for large displacements to perform nonlinear static analysis of unrestrained bodies, which is currently not possible in commercially available finite element codes. This feature allows to simulate free-free boundary conditions at each step of the nonlinear aeroelastic trim iterative solution sequence. The proposed approach is implemented by coupling the MSC.Nastran nonlinear structural solver SOL 400 with a three-dimensional vortex lattice method code. Loads and displacements interpolations between aerodynamic and structural grids are performed using MSC.Nastran six degree-of-freedom splines. The computational environment is tested on a beam-type model of the University of Michigan’s X-HALE, a highly flexible experimental unmanned aerial vehicle for nonlinear aeroelastic flight tests. Numerical results are compared with the University of Michigan’s Nonlinear Aeroelastic Simulation Toolbox and with an aeroelastic solver developed at the German Aerospace Center.

Item URL in elib:https://elib.dlr.de/118373/
Document Type:Conference or Workshop Item (Speech)
Title:A FEM-Based Approach for Nonlinear Aeroelastic Trim of Highly Flexible Aircraft
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ritter, Markus RaimundMarkus.Ritter (at) dlr.dehttps://orcid.org/0000-0003-3828-0397
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, Steady Horizontal Trim, Nastran SOL400, Vortex-Lattice
Event Title:IFASD 2017 - International Forum on Aeroelasticity and Structural Dynamics
Event Location:Como, Italien
Event Type:international Conference
Event Dates:26.-29. Juni 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 - Flight Physics (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:09 Jul 2019 12:00

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