Vibro-Acoustic Analysis of Acoustic Liners For MRI Scanners
Rutt B, Mechefske C, Shao W
Robarts Research Institute
Vibro-acoustic analysis was conducted to predict the acoustic performance of a MRI liner with different thicknesses based on the coupling of a finite element (FE) structural model and a boundary element (BE) acoustical model. Known forces were applied to the structural FE model of the gradient coil to generate a velocity distribution for the acoustical BE model. The sound field inside the liner bore was predicted. The results show that increasing the liner thickness will attenuate more noise. However, the cost of this attenuation will be a much heavier liner and potentially reduced inner radius of the MRI bore. This study also shows that FEM and BEM are powerful simulation tools for vibro-acoustic analyses.