Multi physics modeling of eddy current vibration damping in MRI systems

Vibration induced eddy currents generate magnetic field disturbance in MRI systems and degrade image quality (IQ). In this work, a multi-physics based finite element approach is presented to simulate mechanical vibration and eddy currents. Both simulation and test results indicate that the induced eddy currents play a significant role in attenuating the vibration response and corresponding field disturbance. In order to demonstrate the applicability of the developed technique to a complicated mechanical resonance mode, simulation was performed on a locally deforming hollow cylinder and the results are presented with and without electromagnetic damping.

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