Acoustic Scattering by a Poroelastic Sphere Near a Flat Boundary

摘要

An analysis of sound scattering by a fluid-saturated porous-elastic sphere immersed near the rigid (compliant) boundary of an acoustic halfspace is outlined. The novel features of the Biot dynamic model of poroelasticity along with the translational addition theorem for spherical wave functions are employed to develop a closed-form solution in the form of infinite series. The analytical results are illustrated with a numerical example in which a water-saturated porous sphere, submerged near a rigid wall, is insonified by a plane wave at oblique wave incidence. The numerical results reveal the considerable effects of surface permeability condition, porosity (tortuosity), frame stiffness, incident wave frequency, and proximity to the rigid interface on basic acoustic field quantities. The proposed model can be of practical use in a wide range of applications such as underwater acoustics, colloidal system characterization and microparticle structure identification.