| Autor: |
Manuel Reyes, Hector Climent Manez, Moti Karpel, Lars O. Bernhammer |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. |
| DOI: |
10.2514/6.2016-1711 |
| Popis: |
High altitude long range aircraft have recently gained research interest due to the varied mission profiles they can fulfil. Consequences of their light design are large structural deformations, which cannot be accurately modelled by linear analysis. Geometrically nonlinear effects have strongly contributed to accidents involving prototypes of such aircraft like the Helios project. In this paper an Increased-Order-Modeling (IOM) approach is presented that introduces non-linear structural dynamics effects into reduced-order linear aeroservoelastic models using the IOM-based Dynresp code that was recently developed as a framework for industrial applications and research in the area of non-linear aeroelasticity. For this purpose a full finite element model is segmented and a normal-modes analysis is carried out for the disconnected segments loaded with fictitious masses at the interface coordinates. The resulting modes serve as a basis for the dynamic analysis, in which the structure is re-joined by introducing non-linear compatibility relations for two boundary grid points that have been co-located at the segment interfaces. The basic geometrical assumption is that the segments undergo large rigid-body motion and small elastic deformations. The paper describes the theoretical background, the implementation procedure to Dynresp and the limitations and steps required to perform a non-linear gust response analysis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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