ABSTRACT
ABSTRACT: This paper presents an equivalent of the shear moduli of MRF, which is an important parameter in the Biot theory based on the relaxation spectrum. The Biot’s model is used to calculate the complex wave numbers of the two compressional waves propagating in MRF at normal incidence. The surface impedances and the acoustic absorption of MRF under different external field are simulated. The results agree with the test by Guicking and the absorption of MRF can be changed and improved with the application of external field.
