Loading...

Active Vibration Suppression of Laminated Composite Structures Integrated with Magnetorheological Fluid Segments under Random Excitation

Fattahi Massoom, Zahra | 2013

1879 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44543 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Zabihollah, Abolghasem
  7. Abstract:
  8. Magnetorheological (MR) materials indicate variations in their rheological properties when subjected to different magnetic fields. They have quick time response, in the order of milliseconds, and therefore are potentially applicable to structures and devices when a tunable system response is required. This study presents vibration analysis of laminated composite plate using MR fluid lumps under Random Excitation. A structural dynamic modeling approach is discussed and vibration characteristics of MR adaptive structures are predicted for different magnetic field levels. Linear Quadratic Regulator (LQR) controller is designed to achieve the vibration suppression of the laminated plate. The effects of laminate configuration, locations and size of MR fluid segments on controlled response are investigated. Larger MR segments increase natural frequency of structure compared to the structure with hollow spaces at the same locations. Similarly, larger magnetic fields increase the stiffness and thus improve the dynamic of system. Open-loop and closed-loop responses of the system have been simulated to demonstrate the accuracy and efficiency of the present approach in the vibration control of laminated smart structure. This study can be applied to optimize structures with undesirable vibration during operating in high speed such as helicopters blades
  9. Keywords:
  10. Active Vibration Suppression ; Random Vibration ; Magnetorheological (MR)Fluid

 Digital Object List

 Bookmark

  • Introduction
    • MR Fluid Application
    • Random Vibration Analysis of Multi-Layer Plate
    • Optimal Full-State Feedback Control: Linear Quadratic Regulator
    • Thesis Organization
  • Vibration of Laminated Composite Plate
    • Introduction: Laminated plate
    • Finite Element Analysis
    • Equation of Motion
      • Number of Layers, Thickness and Orientations of the Lamina in Laminate
    • State Space Form
    • Optimal Full-State Feedback: Linear Quadratic Regulator Problem
    • Numerical Examples
    • Conclusions
  • Laminated Plate Integrated with MR
    • Introduction to MR fluids
    • MR Fluid Field-Dependent Complex Shear Modulus
    • Model of MR adaptive plate
    • Governing Equations for Laminate Integrated by MR Segments
    • Equation of Motion of Composite Plate Integrated with MR Segments
    • Numerical Modeling
      • FEM Modeling for Vibration Analysis of Plate
      • Mode Shapes of Vibration of Plates
      • Effect of MR Segments on Mode Shapes
        • MR lumps Configurations categorized by number of segments and location of segments
      • Effect of MR Fluid on Natural Frequency
      • Selecting the Best Configuration for Each Mode (Damping Analysis)
        • Best configuration for modes, two and three
    • Optimal Control
      • Required Voltage
    • Conclusions
  • Vibration Suppression of Laminated Plate Integrated with MR Segment Subjected to Random Loading
    • Introduction: Random or Stochastic Process
    • Governing Equations of Random Vibration
    • Numerical Example
      • Random Vibration of Sandwich Plate
      • Optimal Control
    • Conclusions
  • Conclusion and Future Work
    • Conclusion
    • Future Work
  • References
...see more