A MULTIRESOLUTION ANALYSIS OF SCATTERING BY A PAIR OF LOCAL REGIONS OF COMPLEX HETEROGENEITY

The scattering by a pair of spatially disjoint local regions of comple x (multiscale) stiffness heterogeneity in an unbounded thin linearly e lastic plate is investigated. Issues of the mutual interaction of the spatially disjoint scatterers and its manifestation within a homogeniz ed, or effective, formulation governing large scale response fields ar e the focus. It is shown analytically and numerically that while one m ust incorporate scatterer/scatterer coupling for estimating the large scale response field, one can neglect this coupling in estimating the effective measures for describing the scatterers. (C) 1998 Acoustical Society of America. [S0001-4966(98)00502-5].