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Investigation of Aero-Servo-Elasticity Behavior of Airship by Considering the Torsional Mode of the Fuselage

Etminan, Mahdi | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56447 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. In this research, with the help of a comprehensive dynamic model, the stability, control, dynamics and twisting of airships with flexible bodies and beams have been investigated. For the first time, the influence of the twisting mode of the body on the dynamic behavior and control of the airship has been investigated by considering the pressure drop inside the body. By obtaining the terms of kinetic energy and the potential of the body and beams, the governing equations of the bird have been extracted and with the help of mass integrals, the velocity of the body and beams has been obtained. The answer to this non-linear dynamic couple problem, due to the existence of two types of dynamic behavior, rigid and vibrating, the governing equations have been separated by the perturbation method. Therefore, by providing a control solution for two rigid dynamics problems that are algebraic and nonlinear and the generalized aeroelasticity problem that is linear, the airship is controlled. Non-linear dynamics includes flight dynamics variables that give control inputs in the form of constants in steady states, and nonlinear dynamics includes a linear generalized aeroelasticity problem that is also affected by nonlinear dynamics, and to control this system, the linear quadratic regulator method is used. Used. Finally, the response of the system to the gust input is shown. Also, stability analysis has been done on the linearized equations of the airship
  9. Keywords:
  10. Non-Rigid Airship ; Airship Dynamics ; Torsional Modes ; Aeroelasticity ; Perturbation Theory ; Linear Quadratic Requlator (LQR) ; Potential Fluid Aerodynamics ; Aeroservoelasticity

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