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Influence of excitation amplitude on the characteristics of nonlinear butyl rubber isolators

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Abstract

The purpose of this study is to explore the advantages and characteristics of nonlinear butyl rubber (type IIR) isolators in vibratory shear by comparison with linear isolators. It is known that the mechanical properties of viscoelastic materials exhibit significant frequency and temperature dependence, and in some cases, nonlinear dynamic behavior as well. Nonlinear characteristics in shear deformation are reflected in mechanical properties such as stiffness and damping. Furthermore, even when the excitation amplitude is small the response amplitude may often be large enough that nonlinearities cannot be ignored. The treatment involves developing phenomenological models of the effective storage modulus and effective loss factor of a rubber isolator material as a function of excitation amplitude. The transmissibility of a nonlinear viscoelastic isolator is compared with that of a linear isolator using an equivalent linear damping coefficient. Forced resonance vibration and impedance tests are used to characterize nonlinear parameters and to measure the normalized transmissibility. It is found that as the excitation amplitude of the nonlinear viscoelastic isolator increases, the response amplitude decreases and the transmissibility is improved over that of the linear isolator for excitation frequency that exceeds a particular value governed by the temperature and excitation amplitude. The method of multiple scales and numerical simulations are used to predict the response characteristics of the isolator based on the phenomenological modeling under different values of system parameters.

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Authors and Affiliations

  1. Visteon Corporation, 45000 Helm Street, Plymouth, MI, 48170, USA

    K. Shaska

  2. Gibson Department of Mechanical Engineering, Wayne State University, Detroit, MI, 48202, USA

    R. A. Ibrahim & R. F. Gibson

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  1. K. Shaska
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  2. R. A. Ibrahim
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  3. R. F. Gibson
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Correspondence to R. A. Ibrahim.

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Shaska, K., Ibrahim, R.A. & Gibson, R.F. Influence of excitation amplitude on the characteristics of nonlinear butyl rubber isolators. Nonlinear Dyn 47, 83–104 (2007). https://doi.org/10.1007/s11071-006-9060-x

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