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Vibration Isolation of One Degree of Freedom Systems by Magnetorheological (MR) Damper Under Random Excitation

Nakisa, Ali | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42978 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behzad, Mehdi
  7. Abstract:
  8. The effect of Vibration on the human body is considered as one of the limitations in design and use of HSCs at high speeds. One way to reduce the effect of vibration on the human body is to isolate deck vibrations from the crew by means of seat suspension system. This thesis has studied the effect of using an MR damper on the performance of seat suspension in vibration reduction. In fact, employing MR dampers in seat suspension systems enables us to change their damping. Using an MR damper makes it possible to control seat suspension by semi active control strategies. In this work, a number of proposed mathematical models of an MR damper were studied for numerical analysis and the most appropriate model was simulated in SIMULINK. Among the mathematical models of a seated human body, a three degree of freedom (DOF) system was chosen and simulated in SIMULINK. This system was controlled by different semi active control strategies such as: Skyhook control, Balance logic control, LQG control, Control based on Lyapunov stability theory, Decentralized Bang-Bang control, Modulated homogeneous friction and Fuzzy logic control. In order to validate the results of the simulation, the skyhook controller results were compared to the previous experimental data. Accordingly, the comparison has demonstrated that numerical data have the same trend as the experimental results. Finally, it is concluded that Balance logic controller and Fuzzy controller have the best performance from both practical and vibration reduction point of view.


  9. Keywords:
  10. Semiactive Control ; Seat Suspension System ; Magnetorheological Damper ; Vibration Isolation

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