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Non-Linear Aeroelastic Analysis of Three-Layered Plates with Magneto-Rheological Fluid Core in Supersonic Airflow

Mousavi, Fatemeh | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56022 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Haddadpour, Hassan
  7. Abstract:
  8. This study is a comprehensive analysis on the nonlinear vibration of a sandwich plate containing magnetorheological (MR) fluid as the core layer. The nonlinear aeroelastic analysis of the structure is also discussed to determine the flutter boundaries. In this study, the numerical Generalized Differential Quadrature (GDQ) method is applied to investigate the free vibration analysis of a sandwich plate with a MR fluid core. The classical thin plate theory (CPT) and the First-order Shear Deformation Theory (FSDT) are assumed for face layers and core layer, respectively. These theories along with Von-Karman kinematic formulations are incorporated to extract governing equations. The equations of motion are derived using Hamilton’s principle and simply-supported boundary condition is considered for all edges. By discretizing the equation with GDQ, linear natural frequencies, and loss factors are obtained by solving the standard linear eigenvalue problem at first step. The GDQ results are compared and validated with the previous articles. At second step, displacement control strategy is used to solve the extracted nonlinear equations and evaluate nonlinear characteristics of the MR sandwich plates. Furthermore, the effect of applied magnetic field intensity and geometry parameters on the linear and nonlinear natural frequencies, and loss factors of the structure are studied. The results show when the magnetic field intensities increase, the linear and nonlinear frequencies will increase. Increment of magnetic field intensity reduce the loss factors. With the thickness of the MR layer increasing, the linear and nonlinear frequencies will decrease. The flutter of MR sandwich plate subjected to supersonic airflow is discussed in third step of this study. The first piston theory is used to model the aerodynamic forces. The numerical results show that the magnetorheological core layer is capable of shifting the flutter instability of the system. It is also found that the aspect ratio and the thickness ratios have significant effects on the flutter bounds
  9. Keywords:
  10. Sandwich Panel ; Generalized Diffrential Quadrature ; Nonlinear Vibration ; Flutter ; Von Mises Strain ; Magnetorheological (MR)Fluid ; Viscoelastic Sandwich Plate ; Three-Layered Plates ; Aeroelastic Behavior

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