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

Fattahi Massoom, Zahra | 2013

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  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

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