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An Approach for Nonlinear Aeroelastic and Flight Dynamic Analyses for Very Flexible Aircraft at Trim States of Large Deformations

Hilger, Jonathan and Ritter, Markus Raimund (2023) An Approach for Nonlinear Aeroelastic and Flight Dynamic Analyses for Very Flexible Aircraft at Trim States of Large Deformations. AIAA SciTech 2023 Forum, 23.-27. Jan. 2023, National Harbor, USA. doi: 10.2514/6.2023-0190.

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Official URL: https://arc.aiaa.org/doi/10.2514/6.2023-0190


This paper presents a method for nonlinear aeroelastic and flight dynamic analyses of very flexible aircraft. Therefore, a nonlinear aeroelastic solver is used to obtain steady-state trim solutions, coupling a geometrically nonlinear vortex lattice method with the commercial finite element solver MSC Nastran in a geometrically nonlinear solution sequence. In addition, the updated modal properties, i.e. eigenfrequencies and mode shapes, are extracted at the preloaded trim state with large deformations. Subsequently, the structural model is linearized around the trim condition and fed into a nonlinear flight dynamic solver where the structural dynamics are described using a modal approach. The governing equations of motion of the free-flying aircraft employed are based on a derivation without the mean axes assumption and thus consider inertial coupling of rigid-body and elastic motions. With unsteady aerodynamic forces obtained from an unsteady vortex lattice implementation, the proposed method allows for nonlinear flight-dynamic time-domain simulations of a very flexible aircraft starting from trim states with large deformations. For the purpose of stability analysis, the unsteady vortex lattice method is linearized analytically and integrated with the linearized flight dynamic equations of motion into a linear monolithic state-space model. The aeroelastic and flight dynamic stability is then determined by means of the eigenvalues of the system's dynamics matrix. The proposed method is applied to a highly flexible generic UAV.

Item URL in elib:https://elib.dlr.de/194060/
Document Type:Conference or Workshop Item (Speech)
Title:An Approach for Nonlinear Aeroelastic and Flight Dynamic Analyses for Very Flexible Aircraft at Trim States of Large Deformations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Hilger, JonathanUNSPECIFIEDhttps://orcid.org/0000-0003-4138-0807UNSPECIFIED
Ritter, Markus RaimundUNSPECIFIEDhttps://orcid.org/0000-0003-3828-0397UNSPECIFIED
Date:19 January 2023
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:geometric nonlinearities, VLM, flight dynamics, aeroelasticity, large deformations, flexible aircraft, trim
Event Title:AIAA SciTech 2023 Forum
Event Location:National Harbor, USA
Event Type:international Conference
Event Dates:23.-27. Jan. 2023
Organizer:AIAA - American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Digital Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Hilger, Jonathan
Deposited On:27 Feb 2023 13:43
Last Modified:27 Feb 2023 13:43

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