| Outline of Final Research Achievements |
Magnetorheological elastomers (MRE) are emerging as smart materials for application inthe field of the intelligent devices and structures. In this study, application of a laminated-type MRE to bushings used to isolate vibration transmission in structures was investigated. Viscoelastic property of the laminated MRE bushing was evaluated through tests and calculations. In addition, a nonlinear MRE model consisting of three parts; a fractional viscoelasticity model, magnetic dipole model, and an adaptive smooth Coulomb friction model; was developed in order to mathematically represent the dynamic behavior of MRE with respect to excitation frequency, amplitude, and the applied magnetic field. Furthermore, a frequency estimation method based on an adaptive line enhancer algorithm was developed, which was used to generate appropriate control signal for semi-actively changing the MRE property.
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