Vibration analysis of a novel magnetic-viscous nonlinear passive isolator via finite element simulation

In this paper, the design and the finite element simulation of a novel magnetic-viscous vibration isolator havebeen presented. The proposed isolator consists of permanent magnets axially aligned in repulsion position and a viscousdamper in parallel with them. The nonlinear spring characteristic of the permanent magnets provides a good dampingproperty with this configuration. Explicit finite element analyses have been conducted to examine the dynamic behaviorof the isolator. Output displacements and transmissibility ratios were measured for various magnet configurations,dashpot coefficients, and input displacement excitation frequencies to determine the best damping properties. Theresults of the finite element modeling revealed that the performance of the isolator is highly sensitive to the quantity ofmagnets. Isolators with four or more magnets can successfully reduce the output displacement. The results indicate thatthe isolator significantly reduces the displacement transmissibility in frequencies over the resonant frequency region. Itis possible to ensure an infinite operating life for magnet-viscous vibration isolators by protecting the magnets againstbreakage.

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