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Fuzzy-Pade' Method for Approximating the Aerodynamic Forces in Dynamic Modeling of the Flexible Flapping Wing

Abedinnasab, Mohammad Hossein | 2012

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 42794 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Zohoor, Hassan
  7. Abstract:
  8. In this thesis, we have derived the exact equations of motion for flexible beams. The derived equations are compared with similar equations reported in the literature, and they demonstrate significant power in prediction of the numerical results. The model for planar beams is verified by the performed experiments on carbon fiber rods. A new highly convergent, efficient technique which is quite fast is also developed for both approximating and controlling a system, entitled as fuzzy-Pade method. We then have studied effects of the wing flexibility on enhancing the lift and trust coefficients in the flapping flight. Aerodynamic force generation due to flapping is simulated for both the quasi-steady and unsteady cases. We have used fuzzy-Pade approximation method to derive analytic functions representing the aerodynamic forces. The exact differential equations of motion considering large deflection of the wing with the flying support are also developed and solved. Besides, the importance of nonlinear modeling of the structure is addressed.


  9. Keywords:
  10. Euler-Bernoulli Beam ; Two Dimentional Modeling ; Three Dimensional Modeling ; Ornithopter ; Fuzzy-Pade Method ; Unsteady Analysis

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