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Nonlinear behavior of a high flexibility wing with long span considering large deflection

Lahidjani, M. H. S ; Sharif University of Technology | 2004

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  1. Type of Document: Article
  2. DOI: 10.2514/6.2004-1943
  3. Publisher: 2004
  4. Abstract:
  5. This paper presents a method for nonlinear aeroelastic analysis of a Human Powered Aircraft (HPA) wings. In these types of aircrafts there is a long wing with high flexibility. Wing flexibility coupled with the long span leads to the possibility of the large deflections during normal flight operation, so, nonlinear modal analysis technique is used for structural modeling. Unsteady linear aerodynamic theory is used for determination of aerodynamic loading on the wing (linear aerodynamics and nonlinear structure). Combining these two types of formulation yields a nonlinear aeroelastic model. Mode summation techniques along with Galerkin's method are used to determine the governing equations of the problem. Nonlinear modal analysis techniques are used to predict the aeroelastic behavior of the problem. An example is given which shows the behavior of the wing motion as the velocity approaches the linear flutter speed. The nonlinear results are compared with the same linear results. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved
  6. Keywords:
  7. Aerodynamics ; Aircraft ; Deflection (structures) ; Flight dynamics ; Flutter (aerodynamics) ; Mathematical models ; Modal analysis ; Springs (components)
  8. Source: Collect. of Pap. - 45th AIAA/ASME/ASCE/AHS/ASC Struct., Struct. Dyn. and Mater. Conf.; 12th AIAA/ASME/AHS Adapt. Struct. Conf.; 6th AIAA Non-Deterministic Approaches Forum; 5th AIAA Gossamer Spacecraft Forum, Palm Springs, CA, 19 April 2004 through 22 April 2004 ; Volume 6 , 2004 , Pages 4549-4559 ; 02734508 (ISSN)
  9. URL: https://arc.aiaa.org/doi/10.2514/6.2004-1943