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Nonlinear analysis of 2D flexible flapping wings

Abedinnasab, M. H ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1007/s11071-015-1992-6
  3. Publisher: Kluwer Academic Publishers , 2015
  4. Abstract:
  5. Natural flyers have flexible wings, which deform significantly under the combined inertial and aerodynamic forces. In this study, we focus on the role of chord wise flexibility in 2D pitch and plunge motions. We derive the exact nonlinear 2D equations of motion for a flexible flapping wing with flying support. In achieving the closed-form equations, we use the exact strain field concerning considerable elastic deformations. After numerically solving the novel equations, we validate them in simulations with highly deformable wings. By coupling the derived equations of motion with fluid flow, we study the aerodynamic performance of the geometrically nonlinear flexible flapping wing. Through numerical simulations, we see that a flexible wing generates much lower drag with increasing flexibility. While at angles of attack >50∘ more lift is generated by flexible wings
  6. Keywords:
  7. Closed-form equations of motion ; Fluid–structure interaction ; Aerodynamics ; Control nonlinearities ; Deformation ; Equations of motion ; Flow of fluids ; Nonlinear analysis ; Nonlinear equations ; Wings ; Aero-dynamic performance ; Aerodynamic forces ; Angles of attack ; Closed-form equations ; Flexible flapping wings ; Geometric non-linearity ; Geometrically nonlinear ; Structure interactions ; Flexible wings
  8. Source: Nonlinear Dynamics ; Volume 81, Issue 1-2 , July , 2015 , Pages 299-310 ; 0924090X (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs11071-015-1992-6