Rubber absorbers in rail fastening systems, when exposed to single harmonic excitation with an initial displacement, cause strongly nonlinear behavior of the system, as the proposed nonlinear model has demonstrated. The key strategy of the modeling method was to simulate the hysteresis loop of the rubber components based on the superposition principle that is, the restoring force of the rubber absorber is the sum of a nonlinear damping force superposed on a nonlinear elastic force. In this model, the dynamic stiffness is redefined. A dynamic experiment was carried out in order to determine the parameters of the model and verify its accuracy. The simulated results show close agreement with their measured counterparts, implying that the model is an effective tool for simulating and characterizing the nonlinear dynamic behavior of the rubber absorber subjected to certain vibration modes. Excitation frequency dependency and displacement amplitude dependency of the dynamic stiffness were also further studied and discussed. The results show that the characteristics of dynamic stiffness are closely associated with both displacement amplitude and frequency. An increase in frequency diminishes the first-order dynamic stiffness very slightly but leads to a small rise in the third-order dynamic stiffness. Increasing the amplitude decreases the first-order dynamic stiffness but results in a much more complex influence on the third-order dynamic stiffness, which initially increases then rapidly decreases. Generally, the frequency dependency of dynamic stiffness is not as great as the amplitude dependency.


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    Title :

    Numerical investigation of nonlinear properties of a rubber absorber in rail fastening systems


    Contributors:
    Luo, Y. (author) / Liu, Y. (author) / Yin, H.P. (author)


    Publication date :

    2013


    Size :

    7 Seiten, 9 Bilder, 3 Tabellen, 22 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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