RESPONSE OF A MULTILAYERED INFINITE CYLINDER TO 2-DIMENSIONAL PRESSURE EXCITATION BY MEANS OF TRANSFER-MATRICES

A 6 x 6 transfer matrix is presented to evaluate the response of a mul ti-layered infinitely long elastic cylinder, imbedded in a fluid and e nclosing another fluid, to a given two-dimensional pressure excitation on the outside or inside, or alternatively to evaluate the acoustic p ressure distribution excited by the radial velocity components of the radiating surface. It is shown that the transfer matrix presented is a general case embodying the transfer matrix of one-dimensional pressur e excitation due to a normal incident wave. It is also shown that the transfer matrix can be effectively used to obtain the scattering coeff icient and noise reduction of a multi-layered cylinder for the case of oblique incidence of a plane wave. Numerical results for the scatteri ng form function and noise reduction of a multi-layered infinite cylin der are given to illustrate the effect of two-dimensionality (angle of incidence), and layer material characteristics. (C) 1998 Academic Pre ss Limited.