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Design and Control of Semi-active Suspension System with Variable Stiffness

Rahnavard, Mostafa | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41692 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saadat Foumani, Mahmoud
  7. Abstract:
  8. In this research, the effect of variable stiffness and damping, in suspension system, on car performance was studied. The optimization of car performance was obtained by minimization of an objective function including the body acceleration, suspension travel and tire deflection. Firstly, considering the stochastic input for a quarter car model, minimization of the objective function was done by changing the stiffness and damping coefficients in the frequency domain. The Linear Quadratic Regulator (LQR) method was implemented to minimize the objective function. In order to supply the active force obtained by optimization, different semi-active designs, in which stiffness and damping were changed alone or simultaneously, were introduced. For analyzing the transient and steady state characteristics, the quarter car response to stochastic, sinusoid and bump inputs was studied for different designs. The semi-active designs were also used in a half car model. The results revealed good agreement with those obtained for the quarter car model. Using MATLAB and ADAMS CAR software, the semi-active designs were applied to TIBA (S81) car model, with about 250 DOFs. The results obtained for the whole car model, showed good agreement with those of the half car model
  9. Keywords:
  10. Objective Function ; Linear Quadratic Requlator (LQR) ; Semiactive Suspension System ; Variable Stiffness Spring

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