The output damping force of the magneto-rheological (MR) damper will be reduced with the increment of working temperature. As a result, the performance of the MR suspension system will be degraded. On the basis of the theory of heat transfer and nonlinear vibration, the main resonance of the MR suspension dynamic system with slowly varying parameters will be analyzed in this study. The energy differential equations at the working area of an MR damper were established and solved by the numerical method. The modified Bingham model was applied to calculate the output damping force of the MR damper. The nonlinear dynamic equation of the MR suspension system with a slowly varying parameter was formulated. The steady amplitude response of the MR suspension system under the excitation of main resonance was deduced by the averaging method. The calculated results show that the working temperature will be increased with the increment of running time of the MR damper. Consequently, the output damping force of the MR damper will be significantly reduced and the vibration amplitude variation of the suspension system will also be increased. Therefore, the performance of the MR suspension will be degraded.
DONG XiaoMin WANG XiaoLong.
Main resonance analysis for magneto-rheological suspension system with slowly varying parameter[J]. Journal of Vibration and Shock, 2014, 33(23): 122-126
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