Abstract
Today, numerical methods for structural and aerodynamic problems are reaching highly versatile and reliable levels. Therefore, the coupling of both domains can be solved at a high standard. On the other side, the accuracy of aeroelastic analyses depends on the level of precision with which the stiffness properties and, thus the structural behavior of an aircraft wing structure in means of deformation can be predicted. The presence of uncertainties within the structural model which is integrated in the coupled analysis can affect the fidelity of the structural response and, thus, influence the results of the numeric aerodynamic simulation as well. Investigations carried out by the Institute of Aircraft Design and Lightweight Structures (IFL) in the frame of the MUNA-project were focused on two types of uncertainties affecting the accuracy of the static aeroelastic analysis: stochastic uncertainties and uncertainties due to modeling simplifications. Stochastic uncertainties are caused by the deviation of actual structural parameters in realized aircraft wings, like Young’s modulus or wall thicknesses from the original ideal design. This deviations affect the stiffness of the real structure and, thus the structural and aerodynamic response. A method to estimate the sensitivity of the wing structure to random input parameters is presented in the second part. The second class of uncertainties arises from approximations connected to the idealization of the physical and geometric properties of the real structure used in finite element (FE) structural models. In the first part of this work, an overview of modeling effects is given which affect the stiffness properties of the FE structural models and in turn influence the results of static aeroelastic analysis. The coupled analysis is carried out with a high-order panel method for the aerodynamic domain and a parametric finite element structural model, which allows a wide variation of material and geometric properties of wing box structure. This structural model as well as the aerodynamic method and the coupling routines are presented in the following section.
Access provided by Autonomous University of Puebla. Download to read the full chapter text
Chapter PDF
Similar content being viewed by others
Keywords
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
References
Heinze, W.: Ein Beitrag zur quantitativen Analyse der technischen und wirtschaftlichen Auslegungsgrenzen verschiedener Flugzeugkonzepte für den Transport großer Lasten; ZLR-Forschungsbericht 94-01, Braunschweig (1994)
Österheld, C.M.: Physikalisch begründete Analyseverfahren im integrierten multidisziplinären Flugzeugvorentwurf; ZLR-Forschungsbericht 2003-06, Braunschweig (2003)
Reimer, L., Braun, C., Bae-Hong, C., Ballmann, J.: Computational Aeroelastic Design and Analysis of the HIRENASD Wind Tunnel Wing Model and Tests. In: International Forum on Aeroelasticity and Structural Dynamics (IFASD) 2007, Stockholm, Sweden, Paper IF-077 (2007)
Heinrich, R., Dargel, G.: Spezifikation des Testfalls für den Hauptmeilenstein M8.1 im Verbundvorhaben MEGADESIGN (2006)
Haupt, M., Niesner, R., Unger, R., Horst, P.: Coupling Techniques for Thermal and Mechanical Fluid-Structure-Interactions in Aeronautics. PAMM ů Proc. Appl. Math. Mech. 5, 19–22 (2005)
Schneider, W.: Die Entwicklung und Bewertung von Gewichtsabschätzungsformeln für den Flugzeugvorentwurf unter Zuhilfenahme von Methoden der mathematischen Statistik und Wahrscheinlichkeitsrechnung; Berlin, Techn. Univ., Diss. (1973)
Niu, M.C.Y.: Airframe Structural Design: practical Design Information and Data on Aircraft Structures. Conmilit Pr., Hong Kong (1999)
Patnaik, S., Gendy, A., Berke, L., Hopkins, D.: Modified Fully Utilized Design (MFUD) Method for Stress and Displacement Constraints. NASA Technical Memorandum 4743 (1997)
Malcolm, D.J., Laird, D.L.: Extraction of Equivalent Beam Properties from Blade Models. Wind Energy 10, 135–157 (2007)
Reim, A., Horst, P.: Structural optimization considering stochastic variations of manufacturing alternatives. In: 8th World Congress on Structural and Multidisciplinary Optimization (2009)
Haldar, A., Mahadevan, S.: Probability, Reliability and Statistical Methods in Engineering Design. Wiley & Sons (2000)
Rackwitz, R., Fiessler, B.: Structural Reliability Under Combined load sequences. Computers & Structures 9, 489–494
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Reich, P., Reim, A., Haupt, M., Horst, P. (2013). Uncertainties of Numerical Structural Models in the Frame of Aeroelasticity. In: Eisfeld, B., Barnewitz, H., Fritz, W., Thiele, F. (eds) Management and Minimisation of Uncertainties and Errors in Numerical Aerodynamics. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 122. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-36185-2_7
Download citation
DOI: https://doi.org/10.1007/978-3-642-36185-2_7
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-36184-5
Online ISBN: 978-3-642-36185-2
eBook Packages: EngineeringEngineering (R0)