Numerical simulation for Multichannel Resonant Scattering and absolute phase applied to cylindrical and spherical hollow fluids embedded in an elastic medium

This paper basically founded on the use of the Resonance scattering Theory (RST), combined to the method of MRST (multichannel resonant scattering theory), to study the problem of the interaction of normally incident acoustic waves in environments consisting of a biphasic isotropic elastic matrix, in which is inserted a fluid inclusion (cylindrical or spherical). Initially, we implement the transition S matrix containing the n mode of the longitudinal (L) and transversal (T) wave in an elastic medium. The isolation of the resonances characteristic of the fluid inclusion is done via the S-matrix factorization; that is a product of the soft bottoms non resonant matrix with the resonant scattering matrix. To improve the localization of the resonances, we had to study the absolute phase in connection with MRST. A numerical simulation, with a cylindrical and a spherical fluid (water) cavity in a copper matrix, shows the efficiency of the absolute phase spectra knowledge for the exact determination of the resonances.

کلیدواژه ها:

RST ، MRST ، hollow ، acoustic scattering ، resonance ، S -matrix ، absolute phase