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Validation of numerical methods for gust loads analysis



 Doublet lattice model
zum Bild Doublet lattice model
 CFD model
zum Bild CFD model
 Results of design calculations
zum Bild Results of design calculations
Doublet lattice and CFD models of the gust test bed, together with the results of the design calculations for the transfer function for the effect of gust excitation on the response of a flexible wing.
 

A large number of calculations are required for gust loads analyses. Because of this, gust loads analysis methods use a series of assumptions that allow a large number of calculations to be carried out within a short space of time. These include, for example, the assumption of a linear relationship between aerodynamics and structural dynamics, which normally only applies for small deformations. For large deformations and high angles of attack, these methods become less precise, but are normally conservative, so that they can be accepted for design and certification calculations. However, more precise methods are necessary in order to utilise the potential of new technologies for increasing the performance and safety of aircraft.

The Institute’s gust test bed is used for the validation of this method. Experimental and numerical activities go hand in hand for the planning and performance of tests and their evaluations. For the specification of the excitation amplitudes, aeroelastic calculations are carried out in parallel with the experiment.

With the aid of doublet lattice calculations, the entire operating range as well as parameter changes to the model set up can be covered; with coupled CFD / structural simulations, precise predictions can be made with regard to the transfer function for excitation and response amplitudes for a flexible wing.
 

Literature:

  • Schmidt, Hauke and Neumann, Jens and Mai, Holger (2011)Analysis of forced response in a wind tunnel based on Doublet-Lattice method. CEAS Aeronautical Journal, Volume 2 (Journal no. 13272), Seiten 271-277. Springer. DOI: [10.1007/s13272-011-0017-5]. ISSN 1869-5582.
  • Mai, Holger and Neumann, Jens and Hennings, Holger (2011)Gust response: a validation experiment and preliminary numerical simulations. In: Proceedings "IFASD 2011". IFASD 2011 - 15th International Forum on Aeroelasticity and Structural Dynamics, 27 - 30 June 2011, Paris, Frankreich.

Contact
Prof. Dr.-Ing. Wolf-Reiner Krüger
Head of Loads Analysis and Design

German Aerospace Center

Institute of Aeroelasticity

Göttingen

Tel.: +49 551 709-2808

Fax: +49 551 709-2862

Projekt iGREEN und ALLEGRA - Böen-Simulation und Vergleich mit Messergebnissen (FLIB2 - Experimente)
Anregung eines elastischen Flügels durch Böen
Böen-Versuchsstand
Related Topics
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