Abstract
The properties of ultrasonic propagation velocity in MR fluids (MRF122-EG and MRF132-DG) are studied experimentally. We measured ultrasonic propagation velocity with the pulse method. We used AC magnetic fields with the frequency of 1 Hz and 2 Hz, and the intensity of 50 mT and 75 mT. The change of cluster formation were confirmed by applying different frequency or magnetic flux density.
