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Aeroelastic Modeling, Experimental Validation and Stability Analysis of a Flapping Wing Air Vehicle in Planar Flight

Karimian Aliabdi, Saeed | 2012

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 43153 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Pourtakdoust, Hossein
  7. Abstract:
  8. In this research, aeroelastic model of an elastic flapping wing has been derived in order to be integrated with the flight dynamic model. The model developed in this research well describes the coupled and nonlinear behavior of the passive torsional deformations of the wing during flapping motion. Based on this obtained equations, a precise propulsion model proper for flapping wing vehicles has been introduced. The effect of geometric and mechanical properties of the wing is being accounted. In order to validation of the analytical model several FMAVs as well as an instrumented test stand for online measurements of forces, flapping angle and power consumption have been designed and built specifically for this investigation. Moreover, various types of wings having different torsional stiffness, mass and size have been manufactured in order to study the effects of changing both kinematic parameters and mechanical properties of wing, on produced forces and also consumed power. The test results have been achieved for a variety of aerodynamic and mechanical characteristics. A set of new generalized curves have been introduced via dimensional analysis, in which essential parameters of wing such as stiffness, mass, area, frequency and velocity, are grouped together. A new optimization scheme has been introduced based on these general curves, addressing best wing for maximum propulsive efficiency. Flapping performance is shown to be a function of two independent parameters, namely the reduced frequency and the Aeroelastic coefficient. The trends and the generalized curves can be widely utilized in the design of FMAV or other elastic lift-propulsion generating structures
  9. Keywords:
  10. Flexible Wing ; Simulation ; Test Stands ; Flapping Wing ; Aeroelastic Modeling ; Quasi Steady Aerodynamics

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