| As a smart damping device, Magnetorheological Damper has well prospect, which has characteristics of simple structures, fast response, large output force, continuously adjustable damping force, low consumed power, good controllability and high reliability etc. Based on of theoretical analysis and experimental study, this paper researches on the mechanical properties of MRD and fuzzy control of vibration.According to the experiment for the mechanical properties of the MRD, the damping force-displacement curves and the damping force-velocity curves are mapped. Using the nonlinear modeling method and the polynomial model, a piecewise model with three order polynomial is proposed. Compared with the experimental data, the piecewise three order polynomial model can well describe the nonlinear hysteretic properties of MRD and eliminate the Runge s phenomenon in the data fitting with high order polynomial.Under the harmonic excitation conditions, according to the principle of energy balance, the nonlinear damping force of MRD is equivalently linearized. The relationship between equivalent linear damping coefficient and control current, excitation amplitude, exicitation frequency is established. The relationship between equivalent linear stiffness and control current, excitation amplitude, exicitation frequency is also established.Analysis the dynamic performance of the double spring support plates, which is coupled with a MRD. The dynamic model of this coupling system is established. By adjusting the equivalent linear damping coefficient and the equivalent linear stiffness, the equivalent damping ratio of coupling system is changed, so as to achieve the purpose of vibration control.The fuzzy control method is studied. By utilizing Matlab/Simulink tool, the simulation model of coupling system is established, and the fuzzy controller is designed. According to the simulation results, compared with passive control, fuzzy control can more effectively suppress the vibration of coupling system. |
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